CN101571612A - Polarization controlling encoding method, encoder and quantum key dispatching system - Google Patents
Polarization controlling encoding method, encoder and quantum key dispatching system Download PDFInfo
- Publication number
- CN101571612A CN101571612A CNA2009101319808A CN200910131980A CN101571612A CN 101571612 A CN101571612 A CN 101571612A CN A2009101319808 A CNA2009101319808 A CN A2009101319808A CN 200910131980 A CN200910131980 A CN 200910131980A CN 101571612 A CN101571612 A CN 101571612A
- Authority
- CN
- China
- Prior art keywords
- light
- polarization
- bundle
- polarization control
- behind
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 230000010287 polarization Effects 0.000 title claims abstract description 220
- 238000000034 method Methods 0.000 title claims abstract description 30
- 230000003287 optical effect Effects 0.000 claims abstract description 32
- 238000001514 detection method Methods 0.000 claims abstract description 24
- 230000005540 biological transmission Effects 0.000 claims description 14
- 230000008569 process Effects 0.000 claims description 11
- 230000003595 spectral effect Effects 0.000 claims description 9
- 238000012423 maintenance Methods 0.000 claims description 8
- 238000001914 filtration Methods 0.000 claims description 2
- 230000001902 propagating effect Effects 0.000 claims description 2
- 230000001360 synchronised effect Effects 0.000 claims description 2
- 238000000926 separation method Methods 0.000 abstract description 22
- ZXQYGBMAQZUVMI-GCMPRSNUSA-N gamma-cyhalothrin Chemical compound CC1(C)[C@@H](\C=C(/Cl)C(F)(F)F)[C@H]1C(=O)O[C@H](C#N)C1=CC=CC(OC=2C=CC=CC=2)=C1 ZXQYGBMAQZUVMI-GCMPRSNUSA-N 0.000 abstract 1
- 230000009545 invasion Effects 0.000 abstract 1
- 230000008859 change Effects 0.000 description 9
- 238000010586 diagram Methods 0.000 description 9
- 239000000203 mixture Substances 0.000 description 9
- 239000013307 optical fiber Substances 0.000 description 4
- 238000004891 communication Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 230000002950 deficient Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000835 fiber Substances 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 230000018199 S phase Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
Images
Landscapes
- Optical Communication System (AREA)
Abstract
The invention relates to a polarization controlling encoding method, an encoder and a quantum key dispatching system. The invention is characterized in that the interior of the encoder adopts a polarization-maintaining light path or a ninety-degree Faraday rotation reflector reflection to cause output optical pulse polarization state to be the same; the optical pulse output by the sending terminal of the quantum key dispatching system taking the polarization controlling encoder as the core is passed to the receiving terminal thereof by a quantum channel in a uni-directional way; according to the superposition interference results of the optical pulse and distributorship agreement of the quantum key, the quantum key dispatching is realized. The polarization controlling encoder causes the whole system (comprising a sending set, a reception unit and the quantum channel) to have the interference free capability. The outlet of the sending set and the inlet of the receiving set of the system are added with a reversal photon separation detection unit, thus preventing the invasion of the modulation information and carrying the photon to get off the reception unit of Trojan photon. The quantum key dispatching system can realize unconditional secure assignment of the key.
Description
Technical field
The invention belongs to light transmission private communication technology field, particularly coding method in the quantum-key distribution and device.
Background technology
Early stage quantum-key distribution photon polarization encoder, this mode is suitable for free-space communication and is not suitable for the optical fiber communication system.Do not show as the influence to polarized state of light because the ordinary optic fibre symmetry is not the interference in fine, the transmission path, so the polarization state can't keep light to propagate therein the time, polarization encoder also just is not suitable for using in optical fiber.U.S. Patent number 5307410 has been announced the phase encoding quantum-key distribution scheme of a pair of unequal arm Mach-Ceng Te of a kind of usefulness (Mach-Zehnder) interferometer for the basis, its receive and dispensing device in light pulse experience respectively Mach-dissimilar arm of special interferometer once, because the interference that dissimilar arm is subjected to can not be in full accord, can't offset fully mutually, therefore stability is bad, poor anti jamming capability; Again because two photon pulses respectively by Mach-once the dissimilar arm of special interferometer had experienced different light paths, the polarization state of two pulses can not guarantee to determine relation during the inlet subchannel, therefore very sensitive to the interference in the quantum channel, this interference is particularly serious during the long-range quantum-key distribution, the improvement of all unprincipled property of multiple variant version of this scheme.
Stability problem in view of two unequal arm M-Z interferometer scheme existence, U.S.'s " applied physics wall bulletin " (Appl.Phys.Lett.77 (7), 793 (1997)) a solution has been proposed, make two light pulses between transmission and acceptance point, transmit one back and forth with faraday's catoptron, each light pulse through all light paths has once reached self-compensating effect.Undesired signal had little time to change when this scheme supposition photon pulse was gone through same position twice back and forth, suffered the interferences unanimity of light pulse, thus interference effect is cancelled each other and is reached anti-interference and stable purpose during stack.And in fact, this stable only effective when not oversize and interfering frequency is not too high in transmission range, when transmission range increased, the mistiming increase of same position was experienced in light pulse back and forth, and antijamming capability also just decreases; In addition, because light pulse will be in quantum channel twice back and forth, loss when the channel total losses equal actual amount subchannel double length, usually adopting goes the method for Cheng Qiangguang and backhaul single photon to remedy this defective, but this method that remedies only is applicable to the present situation with overdamp laser pulse simulation single-photon source, the light source of desirable quantum-key distribution should be a single-photon source, but present desirable single-photon source can't be practical, in case use desirable single-photon source, the limit transmission range of this scheme has only present half; A more serious defective is that this scheme has hidden potential safety hazard: the listener-in may decay in proportion with entering the preceding strong signal of reception area, use the very approaching wooden horse signal of wavelength and operation wavelength to replenish again, make that the total monitoring signal intensity in the reception area is constant, it is the signal intensity monitors failure, when signal returns, the wooden horse signal can be separated and detect entrained information by the listener-in, pass the original signal photon back sender by " super low-loss channel " again, as long as the suitable control signal attenuation ratio of listener-in, the reception code check that just can accomplish system is unaffected, does not find thereby be sent out the person.Concerning information security technology, this hidden danger of eavesdropping is fatal.
Summary of the invention
The present invention proposes a kind of polarization controlling encoding method, according to the Polarization Control scrambler of this method construct and the quantum key dispatching system of forming by this scrambler, can between two users, form one group of quantum key of not eavesdropped, realize that the unconditional security of key distributes.
Polarization controlling encoding method of the present invention comprises: under the condition of polarization state of control light pulse, be two light pulses with a light pulse beam splitting of incident, relative time delay is made in two light pulses, the light output of Shu Weiyi road is closed in two light pulses behind the relative time delay; In beam splitting is under the state of two light pulses, perhaps after two light pulses behind the relative time delay being closed the light output of Shu Weiyi road, at least one light pulse is carried out phase modulation (PM) by the quantum key sharing agreement.The condition of the polarization state of described control light pulse is: in beam splitting in the whole process of closing bundle, the polarization state of two light pulses of control, make that the polarization state of closing two light pulses of exporting the bundle back is identical, and in beam splitting in the whole process of closing bundle, two light pulses are all transmitted without quantum channel, but after finishing phase modulation (PM), export two light pulses of closing behind the bundle to quantum channel, carry out one-way transmission.
Preferably, the control to the polarization state of described two light pulses comprises: the polarization state of controlling described two light pulses remains in the whole process of closing bundle constant in beam splitting.
Preferably, the control to the polarization state of described two light pulses comprises: before closing bundle, described two light pulses are respectively through the mirror reflects odd number, and the experience beam splitting is inferior to the light path even number separately that closes bundle.
Preferably, the control of the polarization state of described two light pulses is comprised: one of described two light pulses are output directly, and in described two light pulses another be through the mirror reflects even number, and the experience beam splitting is inferior to the light path even number that closes bundle.
Preferably, described catoptron is 90 degree rotation faraday catoptrons.
Preferably, after two light pulses behind the relative time delay being closed the light output of Shu Weiyi road, no longer the polarization state of light pulse is controlled.
Preferably, described polarization controlling encoding method also comprises: the light that closes behind the bundle is exported through optical circulator.More preferably, close light behind the bundle behind spectral filter, export through optical circulator again.
Polarization Control scrambler of the present invention comprises: the Polarization Control beam splitter is used for a light pulse with incident and is beamed into two light pulses and propagates along two light paths; The Polarization Control chronotron is arranged in any light path of described two light paths, is used for the light pulse of propagating through this light path is applied time-delay; The Polarization Control bundling device is used for the light output of Shu Weiyi road is closed in two light pulses that propagate through two light paths, behind the relative time delay; Phase-modulator, be arranged in any light path of described two light paths, perhaps be arranged in the light path of closing behind the bundle, at least one light pulse is carried out phase modulation (PM) by the quantum key sharing agreement, wherein said Polarization Control beam splitter, described Polarization Control bundling device, described two light paths and the device that is positioned on described two light paths are Polarization Control type device, polarization state to two light pulses is controlled, make that the polarization state of closing two light pulses of exporting the bundle back is identical, and in beam splitting in the whole process of closing bundle, two light pulses are all transmitted without quantum channel, but after finishing phase modulation (PM), export two light pulses of closing behind the bundle to quantum channel, carry out one-way transmission.
Preferably, described Polarization Control beam splitter, described Polarization Control bundling device, described two light paths and the device that is positioned on described two light paths are polarization maintenance device.
Preferably, described Polarization Control scrambler also comprises: two catoptrons, lay respectively in one of described two light paths, and be used to reflect the light pulse of incident, wherein Polarization Control beam splitter and Polarization Control bundling device are same device.
Preferably, described Polarization Control scrambler also comprises: two catoptrons, be arranged in one of described two light paths, and be used to reflect the light pulse of incident, wherein Polarization Control beam splitter and Polarization Control bundling device are same device.
Preferably, described catoptron is 90 degree rotation faraday catoptrons.
Preferably, described phase-modulator is arranged in the light path of closing behind the bundle, and described phase-modulator is Polarization Control type device or unpolarized control type device.
Preferably, described Polarization Control scrambler also comprises: optical circulator, be positioned at the output terminal of described Polarization Control scrambler, export from second port of optical circulator from the light that first port of optical circulator is imported, export from the 3rd port of optical circulator from the light that second port of optical circulator is imported, close light output behind the bundle from first port input of optical circulator, and from second port output of optical circulator.
More preferably, described Polarization Control scrambler also comprises: detector, link to each other with the 3rd port of optical circulator, and be used for the reverse input light from second port of optical circulator is detected.In order to remedy the deficiency of optical circulator and detector operation spectral bandwidth, described Polarization Control scrambler can also comprise: spectral filter, link to each other with first port of optical circulator, and be used for light output the carrying out spectral filtering behind the involutory bundle.
Quantum key dispatching system of the present invention comprises: optical pulse generator is used to produce light pulse; According to Polarization Control scrambler of the present invention, as transmitting terminal, the Polarization Control coding is carried out in the light pulse that is used for that optical pulse generator is produced; Quantum channel is used to transmit the light output behind the bundle of closing from transmitting terminal; According to Polarization Control scrambler of the present invention, as receiving end, be used for to from transmitting terminal, that transmit through quantum channel, close light output behind the bundle and carry out and decode by the quantum key sharing agreement, produce two light pulse groups, each light pulse group is derived by the light pulse that transmitting terminal sent; And single-photon detector, be used for the stack result of interference of each at least one light pulse of two light pulse groups of synchronous detection, and carry out quantum-key distribution according to quantum key distribution protocol.
Preferably, if in transmitting terminal, phase-modulator is arranged in the light path of closing behind the bundle, and then at receiving end, phase-modulator is arranged in the input light path before the beam splitting.
Described quantum channel can be optical waveguide, optical fiber, free space, discrete optical element, slab guide optical element, fibre optic member or any light propagation ducts that is combined into more than two in them.
Compare with the existing scrambler that two unequal arm Mach-once special interferometer is formed, because the polarization state of Polarization Control scrambler of the present invention portion's control within it light pulse, at first make scrambler insensitive to self suffered interference, quantum key dispatching system reduces greatly to environment requirement; Simultaneously because the polarization state between two light pulses of inlet subchannel is identical, make light pulse suffered interference in co-route when the receiving end stack is interfered, cancel each other, realized that signal transmission and channel disturbance are irrelevant, improved the practical stability of system greatly; Reflect in the mirror Polarization Control scrambler 90 degree rotation faraday of the present invention, because twice process of light pulse phase-modulator, and the polarization direction when passing through is orthogonal, as long as phase modulated signal lasts longer than light pulse twice elapsed time back and forth, then the polarization state of phase modulation size and light pulse is irrelevant, therefore the phase-modulator that available polarization is relevant reaches the purpose of polarization irrelevant phase modulation (PM), and also can reduce the rate request of phase-modulator; In the Polarization Control scrambler of forming with polarization maintenance beam splitter of the present invention, because light pulse all is maintained on the specific polarization state, the phase-modulator that polarization is relevant is suitable for naturally.
In quantum key dispatching system of the present invention, transmitting terminal and receiving end can increase reverse photon separation detection unit (optical circulator and single-photon detector), after having increased reverse photon separation detection unit, since signal pulse from the unidirectional throughput subchannel transmission of dispensing device to receiving trap, single-photon detector can be separated and imported to the photon of any opposite direction transmission detects, so not only can stop possible wooden horse photon to enter scrambler and carry out coded message, and can know whether that the listener-in exists, stopped the possibility of being attacked by wooden horse; Consider that single-photon detector and optical circulator operation wavelength have certain limit, can increase the logical spectral filter of band in the quantum key dispatching system of the present invention, light pulse in the system works wavelength coverage can be passed through, the light of wavelength can not pass through beyond the operating wavelength range, remedies single-photon detector and the wide inadequately shortcoming of circulator operating wavelength range.
Description of drawings
Fig. 1 keeps the basic composition synoptic diagram of light path Mach-once special interferometer type Polarization Control scrambler for polarization.
Fig. 2 keeps the basic composition synoptic diagram of light path reflection mirror Polarization Control scrambler for polarization.
Fig. 3 is the basic composition synoptic diagram that 90 degree rotation faraday are reflected mirror Polarization Control scrambler.
Fig. 4 is the basic composition synoptic diagram that 90 degree rotation faraday are reflected the change type of mirror Polarization Control scrambler.
Fig. 5 rotates the basic composition synoptic diagram that faraday are reflected mirror Polarization Control scrambler for 90 degree that phase-modulator is positioned at output light path.
Fig. 6 keeps the basic composition synoptic diagram of light path reflection mirror Polarization Control scrambler for the polarization that uses the variable light beam splitter.
Fig. 7 reflects the basic composition synoptic diagram of mirror Polarization Control scrambler for the 90 degree rotation faraday that use the variable light beam splitter.
Fig. 8 is a kind of synoptic diagram of reverse photon separation detection unit.
Fig. 9 is the another kind of synoptic diagram that increases the reverse photon separation detection unit of the logical spectral filter of band.
Figure 10 is for being the phase modulation (PM) optical fiber quantum key dispatching system structural representation of core with the Polarization Control scrambler.
Embodiment
Embodiment 1:
Form structure as shown in Figure 1 for first kind of Polarization Control scrambler in the quantum key dispatching system of the present invention: it keeps beam splitter 3,6 by two 2 * 2 3dB polarization, a polarization keeps phase-modulator 5 and a polarization to keep delay line 4 to form, and constitutes a polarization jointly and keeps Mach-once special interferometer.Wherein the 3dB polarization keeps the two-port 1 and one of 2 input ends as the Polarization Control scrambler of a side of beam splitter 3, one of two- port 7,8 of the opposite side of 3dB polarization maintenance beam splitter 6 is as output terminal, polarization keeps phase-modulator 5 and polarization to keep delay line 4 (order arbitrarily) to insert any arm of special interferometer of above-mentioned Mach-once together, or the two inserts two arms of special interferometer of above-mentioned Mach-once respectively.During work, light pulse keeps the port one or 2 of beam splitter 3 to enter polarization maintenance beam splitter 3 through polarization and is divided into two-way, one tunnel process polarization keeps phase-modulator 5 to carry out phase modulation (PM), another road keeps delay line 4 time-delays through polarization, two-way behind the relative time delay keeps beam splitter 6 synthetic routed ports 7 or 8 outputs through polarization, because of being polarization, all light paths keep light path, so the polarization state of Shu Chu two pulses is identical thus.When polarization kept phase-modulator 5 and polarization to keep delay line 4 to be positioned at polarization keeping the same arm of the special interferometer of Mach-once, The above results was unaffected.
Embodiment 2:
Second kind of Polarization Control scrambler in the quantum key dispatching system of the present invention form structure as shown in Figure 2: it keeps beam splitter 11, two catoptrons 13 and 15, polarizations to keep phase-modulators 12 and a polarization to keep delay line 14 to form by one 2 * 2 3dB polarization.Wherein the 3dB polarization keeps the two- port 9 and 10 of a side of beam splitter 11 all to can be used as the input and output side of Polarization Control scrambler, one of two-port of the opposite side of 3dB polarization maintenance beam splitter 11 connects polarization successively and keeps phase-modulator 12, catoptron 13, the homonymy another port polarization that then is linked in sequence keeps delay line 14, catoptron 15, a kind of slightly change but the identical structure of function is to keep delay line 14 and polarization to keep phase-modulator 12 (sequence independence) to be serially connected in same port simultaneously polarization, and the another port only connects a catoptron.During work, light pulse keeps the port 9 of beam splitter 11 to enter polarization maintenance beam splitter 11 through polarization and is divided into two-way, one the tunnel through 14 time-delays of polarization maintenance delay line, reflect by catoptron 15, another road reflects through catoptron 13 after polarization keeps phase-modulator 12 to carry out phase modulation (PM) again, the two-way light pulse that reflects keeps 10 outputs of beam splitter 11 synthetic routed ports through polarization, because of being polarization, all light paths keep light path, so identical by the polarization state of 10 two pulses of exporting.Keep phase-modulator 12 (sequence independence) to be serially connected in same port when polarization keeps delay line 14 and polarization, and the another port is when only connecting a catoptron, The above results is unaffected.Light pulse is imported from 10 ports, 9 ports output and come to the same thing during simultaneously as input and output with port 9 or 10.
Embodiment 3:
The third of Polarization Control scrambler in the quantum key dispatching system of the present invention formed structure as shown in Figure 3: it is made up of one 2 * 2 3dB beam splitter 18, two 90 degree rotation faraday's catoptrons 20 and 22, phase-modulators 19 and a delay line 21.Wherein the two- port 16 and 17 of a side of 3dB beam splitter 18 is respectively as the input and output side of Polarization Control scrambler, one of two-port of the opposite side of 3dB beam splitter 18 connects phase-modulator 19,90 degree rotation faraday catoptrons 20 successively, homonymy another port delay line 21, the 90 degree rotation faraday catoptrons 22 that then are linked in sequence.During work, light pulse enters beam splitter 18 through the port one 6 of beam splitter 18 and is divided into two-way, one the tunnel through delay line 21 time-delays, reflect by 90 degree rotation faraday catoptrons 22, another road reflects through 90 degree rotation faraday catoptrons 20 after phase-modulator 19 carries out phase modulation (PM) again, the two-way light pulse that reflects is through 17 outputs of beam splitter 18 synthetic routed ports, because of two light paths are all rotated faraday's mirror reflects and experience light path even number separately through 90 degree, so the polarization state of Shu Chu two pulses is identical thus.Light pulse is imported from 17 ports, 16 ports output and come to the same thing during simultaneously as input and output with port one 6 or 17.
Embodiment 4:
Another kind of structure slightly change but the identical Polarization Control scrambler of function as shown in Figure 4, difference is phase-modulator 19, delay line 21,90 degree rotation faraday catoptrons 22 are linked in sequence on a port of coupling mechanism (wherein 19 and 21 order can reciprocity), only connects one 90 degree rotation faraday catoptron 20 on the another port.During work, light pulse enters beam splitter 18 through the port one 6 of beam splitter 18 and is divided into two-way, one the tunnel through phase-modulator 19 carry out phase modulation (PM) again through delay line 21 time-delay (sequence independence) after, reflect by 90 degree rotation faraday catoptrons 22, another route 90 degree rotation faraday catoptrons 20 reflect, the two-way light pulse that reflects is through 17 outputs of beam splitter 18 synthetic routed ports, because of two light paths are all rotated faraday's mirror reflects and experience light path even number separately through 90 degree, so the polarization state of Shu Chu two pulses is identical thus.Light pulse is imported from 17 ports, 16 ports output and come to the same thing during simultaneously as input and output with port one 6 or 17.
Embodiment 5:
The 4th kind of Polarization Control scrambler in the quantum key dispatching system of the present invention form structure as shown in Figure 6: it keeps variable beam splitter 25, two catoptrons 23 and 27, polarizations to keep phase-modulators 24 and a polarization to keep delay line 26 to form by one 2 * 2 polarization.Wherein polarization keep variable beam splitter 25 one of two ports of a side as the output terminal 28 of Polarization Control scrambler, the another port keeps delay line 26 to connect catoptron 27 through polarization; Polarization keeps one of two ports of opposite side of variable beam splitter 25 as the input end 29 of Polarization Control scrambler, and the another port keeps phase-modulator 24 to connect catoptron 23 through polarization.A kind of slightly change but the identical structure of function is to keep delay line 26 and polarization to keep phase-modulator 24 (sequence independence) to be serially connected in same port polarization, and the another port only connects a catoptron.During work, light pulse keeps the port 29 of variable beam splitter 25 to enter polarization through polarization keeping variable beam splitter 25 to be divided into two-way, one the tunnel directly keeps the port 28 of variable beam splitter 25 directly to export from polarization, another road keeps delay line 26 time-delays through polarization, reflect by catoptron 27, keep variable beam splitter 25 through polarization again, keep phase-modulator 24 to carry out phase modulation (PM) through polarization again after catoptron 23 reflects, the light pulse that reflects keeps 28 outputs of the synthetic routed port of the variable beam splitter 25 and the light pulse of above-mentioned direct output through polarization, when beam splitting is carried out in light pulse, the control polarization keeps the splitting ratio of variable beam splitter, make by two light pulse amplitudes of port 28 outputs equal, because of being polarization, all light paths keep light path, so the polarization state of Shu Chu two light pulses is identical thus.Keep phase-modulator 24 (sequence independence) serial connection to go into same port when polarization keeps delay line 26 and polarization, and the another port is when only connecting a catoptron, The above results is unaffected.Pulse is imported from 28 ports, comes to the same thing during the output of 29 ports.
Embodiment 6:
The 5th kind of Polarization Control scrambler in the quantum key dispatching system of the present invention form structure as shown in Figure 7: it is made up of one 2 * 2 variable beam splitter 32, two 90 degree rotation faraday's catoptrons 30 and 34, phase-modulators 31 and a delay line 33.One of two ports of one side of wherein variable beam splitter 32 are as the output terminal 35 of Polarization Control scrambler, and the another port connects 90 degree rotation faraday catoptrons 34 through delay line 33; One of two ports of the opposite side of variable beam splitter 32 are as the input end 36 of Polarization Control scrambler, and the another port connects 90 degree rotation faraday catoptrons 30 through phase-modulator 31.A kind of slightly change but the identical structure of function is that delay line 33 is connected in series into same port with phase-modulator 31 (sequence independence), and the another port only connects one 90 degree rotation faraday catoptron.During work, light pulse enters variable beam splitter 32 through the port 36 of variable beam splitter 32 and is divided into two-way, one the tunnel directly directly exports from the port 35 of variable beam splitter 32, another road is through delay line 33 time-delays, reflect by 90 degree rotation faraday catoptrons 34, pass through variable beam splitter 32 again, carry out phase modulation (PM) through phase-modulator 31 again after 90 degree rotation faraday catoptrons 30 reflect, the light pulse that reflects is through 35 outputs of the synthetic routed port of the variable beam splitter 32 and the light pulse of above-mentioned direct output, when beam splitting is carried out in light pulse, control the splitting ratio of variable beam splitter, make by two pulse heights of port 35 outputs equal, because of two light paths are all rotated faraday's mirror reflects and experience light path even number separately through 90 degree, so the polarization state of Shu Chu two pulses is identical thus.When delay line 33 and phase-modulator 31 (sequence independence) are serially connected in same port, and the another port is when only connecting one 90 degree rotation faraday catoptron, and The above results is unaffected.Pulse is imported from 35 ports, comes to the same thing during the output of 36 ports.
Embodiment 7:
In the composition structure of five kinds of cited Polarization Control scramblers, phase-modulator all is movable to the identical phase modulation (PM) function of realization in the output light path in the foregoing description.For example: the Polarization Control scrambler that a kind of phase-modulator is arranged in output light path as shown in Figure 5, it is made up of one 2 * 2 3dB beam splitter 18, two 90 degree rotation faraday's catoptrons 20 and 22, phase-modulators 19 and a delay line 21.One of two-port of a side of 3dB beam splitter 18 16 input ends wherein as the Polarization Control scrambler, the another port connects the output terminal 17 of phase-modulator 19 backs as the Polarization Control scrambler, one of two-port of the opposite side of 3dB beam splitter 18 connects 90 degree rotation faraday catoptrons 20, homonymy another port delay line 21, the 90 degree rotation faraday catoptrons 22 that then are linked in sequence.When described Polarization Control scrambler is used for receiving end, the above-mentioned phase-modulator that is positioned at output light path must move to the input light path before the pulse beam splitting, and for example: the phase-modulator 19 among the Polarization Control scrambler 49-5 must change into and is serially connected in port one 6 by being serially connected in port one 7.During work, light pulse enters beam splitter 18 through the port one 6 of beam splitter 18 and is divided into two-way, one the tunnel through delay line 21 time-delays, reflect by 90 degree rotation faraday catoptrons 22, another road 90 degree rotation faraday catoptrons 20 reflect, the two-way light pulse that reflects is exported through port one 7 after beam splitter 18 synthetic route phase-modulators 19 carry out phase modulation (PM) respectively again, because of two light paths are all rotated faraday's mirror reflects and experience light path even number separately through 90 degree, so the polarization state of Shu Chu two pulses is identical thus.When this Polarization Control scrambler was used for receiving end, the above-mentioned phase-modulator 19 that is arranged in output light path must move to the input light path before the pulse beam splitting, carries out phase modulation (PM) respectively by two light pulses of 19 pairs of inputs of phase-modulator.When above-mentioned phase-modulator is arranged in the output light path of transmitting terminal or is arranged in the input light path of receiving end the polarization retention performance is not required.
Embodiment 8:
In the quantum-key distribution device of the present invention oppositely the photon separation detection unit by: optical circulator 38 and single-photon detector 37 are formed.Wherein, the incident port 39 of circulator is as the input port of reverse photon separation detection unit, the exit ports 40 of circulator is as the reverse output port in the same way of photon separation detection unit, and will be separated by circulator 38 and the single-photon detector 37 that leads detects from the reverse photon of output port 40 incidents in the same way.As shown in Figure 8.During work, the forward photon of importing from the incident port 39 of circulator directly passes through, exit ports 40 outputs by circulator, if there is photon oppositely to enter reverse photon separation detection unit from port 40, then circulator 38 will stop this photon from port 39 outputs, and this photon guiding single-photon detector 37 is detected, to have judged whether that eavesdropping wooden horse photon exists, when using it for receiving end, a road of signal photon after the interference is detected by detector 27 equally, and testing result is used as quantum key information.
Embodiment 9:
The operating wavelength range of considering circulator and single-photon detector is limited, may have wavelength and oppositely enter the Polarization Control scrambler away from the photon of circulator and single-photon detector, a kind of slightly different reverse photon separation detection unit as shown in Figure 9: its difference is: input port 39 backs increase an optical band pass filter 41.Optical band pass filter 41 allows the light in the system works wavelength coverage pass through during work, and allows the photon beyond the reverse photon separation detection unit operating wavelength range can not pass through the anti-ability of eavesdropping of enhanced system.
Embodiment 10:
Utilize Polarization Control scrambler of the present invention, reverse photon separation detection unit and single-photon detector, light-pulse generator, can form a kind of typical quantum key dispatching system such as Figure 10 and show: wherein dispensing device is made up of single-photon source 42 (can be substituted by the simulation single-photon source that laser instrument and overdamp device are formed), Polarization Control scrambler 43 of the present invention, reverse photon separation detection unit 44.Specifically be connected to: Polarization Control scrambler 43 (can be 49-1,49-2,49-3,49-6, arbitrary in 49-7 or their change type) input end is connected with the output port of single-photon light source 42, the output terminal of Polarization Control scrambler 43 (can be 50-1 with reverse photon separation detection unit 44 then, arbitrary among the 50-2) input end connects, and oppositely the output port in the same way of photon separation detection unit 44 is connected with quantum channel 45 outside being positioned at the place of safety as the signal output port of dispensing device.
The receiving trap of quantum key dispatching system (can be 49-1 by Polarization Control scrambler 47 of the present invention then, 49-2,49-3,49-6, arbitrary in 49-7 or their change type, wherein 49-3 or 49-7 are better), oppositely photon separation detection unit 46 (can be among 50-1 and the 50-2 arbitrary) and single-photon detector 48 compositions.Specifically be connected to: quantum channel 45 enters to receive in the place of safety and is connected with the input end of reverse photon separation detection unit 46, oppositely the output terminal in the same way of photon separation detection unit 46 is connected with the input end of Polarization Control scrambler 47, and the output terminal of Polarization Control scrambler 47 then is connected with single-photon detector 48.
Quantum key distribution method is: the sender at first sends a single photon pulses by single-photon source 42, and (the actual pulse laser of overdamp that can adopt replaces, require the contained photon number of each pulse to be not more than 1) enter Polarization Control scrambler 43, the Polarization Control scrambler carries out phase modulation (PM) with single photon pulses beam splitting, relative time delay and to one of them by the quantum key sharing agreement, and identical two light pulses of output polarization attitude enter quantum channel 45 and the unidirectional receiving trap of passing to after by reverse photon separation detection unit 44; After these two light pulses arrive receiving trap through quantum channel 45, earlier enter Polarization Control scrambler 47 by reverse photon separation detection unit 46, Polarization Control scrambler 47 is once more with these two pulse beam splitting, make relative time delay and carry out phase modulation (PM) by the quantum key sharing agreement by the quantum key sharing agreement; One of interference signal of Polarization Control scrambler 47 outputs is directly delivered in the single-photon detector 48 and is detected (for reducing dark counts and the not interference of stem portion mutually, the detection here need be adopted the time gate pattern, gate-control signal can be provided by the classical channel of transmitting terminal), second detecting of the interference signal of Polarization Control scrambler 47 outputs by reverse photon separation detection unit separation back, testing result according to above-mentioned two interference signals, send and take over party's phase modulation recording and the information that both sides openly contrast, and according to the agreement of quantum key distribution protocol, can obtain a quantum key, repeat said process, can set up the quantum key of the unconditional security of random length; Because the inner polarization that adopts of Polarization Control scrambler keeps light path or 90 degree faraday rotator mirrors to make two light pulse polarization states of output keep identical, thereby system has good antijamming capability.Use same port as input and output port to be simultaneously when sending and receiving device adopts the Polarization Control scrambler, need to increase beam splitting elements such as circulator, Y type beam splitter in the light path to separate the signal of input and output; When sending and receiving device adopts Polarization Control scrambler 49-6 and 49-7, to the light pulse beam splitting time, need control splitting ratio, make two light pulse amplitudes of output equate, with the bit error rate of the quantum key that reduces final generation.
Claims (19)
1, a kind of polarization controlling encoding method comprises:
Under the condition of the polarization state of controlling light pulse,
With a light pulse beam splitting of incident is two light pulses,
Relative time delay is made in two light pulses,
The light output of Shu Weiyi road is closed in two light pulses behind the relative time delay,
In beam splitting is under the state of two light pulses, perhaps after two light pulses behind the relative time delay being closed the light output of Shu Weiyi road, at least one light pulse is carried out phase modulation (PM) by the quantum key sharing agreement,
The condition of the polarization state of wherein said control light pulse is:
In the whole process of closing bundle, the polarization state of two light pulses of control makes that the polarization state of closing two light pulses of exporting the bundle back is identical in beam splitting, and
In the whole process of closing bundle, two light pulses are all without the quantum channel transmission in beam splitting, but after finishing phase modulation (PM), export two light pulses of closing behind the bundle to quantum channel, carry out one-way transmission.
2, polarization controlling encoding method as claimed in claim 1 is characterized in that
Control to the polarization state of described two light pulses comprises: the polarization state of controlling described two light pulses remains in the whole process of closing bundle constant in beam splitting.
3, polarization controlling encoding method as claimed in claim 1 is characterized in that
Control to the polarization state of described two light pulses comprises: before closing bundle, described two light pulses are respectively through the mirror reflects odd number, and the experience beam splitting is inferior to the light path even number separately that closes bundle.
4, polarization controlling encoding method as claimed in claim 1 is characterized in that
Control to the polarization state of described two light pulses comprises: one of described two light pulses are output directly, and in described two light pulses another be through the mirror reflects even number, and the experience beam splitting is inferior to the light path even number that closes bundle.
5, as claim 3 or 4 described polarization controlling encoding methods, it is characterized in that
Described catoptron is 90 degree rotation faraday catoptrons.
6, as the described polarization controlling encoding method of one of claim 1～5, it is characterized in that
After two light pulses behind the relative time delay being closed the light output of Shu Weiyi road, no longer the polarization state of light pulse is controlled.
7, as the described polarization controlling encoding method of one of claim 1～6, also comprise:
The light that closes behind the bundle is exported through optical circulator.
8, polarization controlling encoding method as claimed in claim 7 is characterized in that
Close light behind the bundle behind spectral filter, export through optical circulator again.
9, a kind of Polarization Control scrambler comprises:
The Polarization Control beam splitter is used for a light pulse with incident and is beamed into two light pulses and propagates along two light paths;
The Polarization Control chronotron is arranged in any light path of described two light paths, is used for the light pulse of propagating through this light path is applied time-delay;
The Polarization Control bundling device is used for the light output of Shu Weiyi road is closed in two light pulses that propagate through two light paths, behind the relative time delay;
Phase-modulator is arranged in any light path of described two light paths, perhaps is arranged in the light path of closing behind the bundle, and at least one light pulse is carried out phase modulation (PM) by the quantum key sharing agreement,
Wherein said Polarization Control beam splitter, described Polarization Control bundling device, described two light paths and the device that is positioned on described two light paths are Polarization Control type device, polarization state to two light pulses is controlled, make that the polarization state of closing two light pulses of exporting the bundle back is identical, and
In the whole process of closing bundle, two light pulses are all without the quantum channel transmission in beam splitting, but after finishing phase modulation (PM), export two light pulses of closing behind the bundle to quantum channel, carry out one-way transmission.
10, Polarization Control scrambler as claimed in claim 9 is characterized in that
Described Polarization Control beam splitter, described Polarization Control bundling device, described two light paths and the device that is positioned on described two light paths are polarization maintenance device.
11, Polarization Control scrambler as claimed in claim 9 also comprises:
Two catoptrons lay respectively in one of described two light paths, are used to reflect the light pulse of incident,
Wherein Polarization Control beam splitter and Polarization Control bundling device are same device.
12, Polarization Control scrambler as claimed in claim 9 also comprises:
Two catoptrons are arranged in one of described two light paths, are used to reflect the light pulse of incident,
Wherein Polarization Control beam splitter and Polarization Control bundling device are same device.
13, as claim 10 or 11 described Polarization Control scramblers, it is characterized in that
Described catoptron is 90 degree rotation faraday catoptrons.
14, as the described Polarization Control scrambler of one of claim 9～13, it is characterized in that
Described phase-modulator is arranged in the light path of closing behind the bundle, and described phase-modulator is Polarization Control type device or unpolarized control type device.
15, as the described Polarization Control scrambler of one of claim 9～14, also comprise:
Optical circulator, be positioned at the output terminal of described Polarization Control scrambler, export from second port of circulator from the light that first port of optical circulator is imported, export from the 3rd port of circulator from the light that second port of circulator is imported, close light behind the bundle from first port input of circulator, and from second port output of circulator.
16, Polarization Control scrambler as claimed in claim 15 also comprises:
Detector links to each other with the 3rd port of circulator, is used for the reverse input light from second port of circulator is detected.
17, as claim 15 or 16 described Polarization Control scramblers, also comprise:
Spectral filter links to each other with first port of circulator, is used for light output the carrying out spectral filtering behind the involutory bundle.
18, a kind of quantum key dispatching system comprises:
Optical pulse generator is used to produce light pulse;
Transmitting terminal adopts according to the described Polarization Control scrambler of one of claim 9～17, and the Polarization Control coding is carried out in the light pulse that is used for that optical pulse generator is produced;
Quantum channel is used to transmit the light output behind the bundle of closing from transmitting terminal;
Receiving end, employing is according to the described Polarization Control scrambler of one of claim 9～17, be used for to from transmitting terminal, that transmit through quantum channel, close light output behind the bundle and carry out and decode by the quantum key sharing agreement, produce two light pulse groups, each light pulse group is derived by the light pulse that transmitting terminal sent; And
Single-photon detector is used for the stack result of interference of each at least one light pulse of two light pulse groups of synchronous detection, and carries out quantum-key distribution according to quantum key distribution protocol.
19, quantum key dispatching system as claimed in claim 18 is characterized in that
If in transmitting terminal, phase-modulator is arranged in the light path of closing behind the bundle, and then at receiving end, phase-modulator is arranged in the input light path before the beam splitting.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009101319808A CN101571612B (en) | 2004-02-02 | 2004-02-02 | Polarization controlling encoder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009101319808A CN101571612B (en) | 2004-02-02 | 2004-02-02 | Polarization controlling encoder |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2004100139966A Division CN1651947A (en) | 2004-02-02 | 2004-02-02 | Polarization control coding method coder and quantum key distributing system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101571612A true CN101571612A (en) | 2009-11-04 |
| CN101571612B CN101571612B (en) | 2012-12-26 |
Family
ID=41231005
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009101319808A Expired - Lifetime CN101571612B (en) | 2004-02-02 | 2004-02-02 | Polarization controlling encoder |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101571612B (en) |
Cited By (29)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102368705A (en) * | 2011-11-14 | 2012-03-07 | 中国科学技术大学 | Attacking method for polarization coded quantum key distribution system |
| CN101800636B (en) * | 2010-02-04 | 2012-07-25 | 安徽量子通信技术有限公司 | Synchronizer and synchronization method for quantum key distribution |
| CN103475425A (en) * | 2013-07-26 | 2013-12-25 | 华东师范大学 | Single photon source based on Faraday-Sagnac loop and realization method thereof |
| CN103986527A (en) * | 2014-06-06 | 2014-08-13 | 中国科学技术大学 | High-speed low-voltage phase modulation method |
| CN104579641A (en) * | 2014-12-24 | 2015-04-29 | 上海理工大学 | Phase encoding device in quantum communication system |
| CN105486483A (en) * | 2016-01-11 | 2016-04-13 | 北京中科思远光电科技有限公司 | Spatial and temporal multiplexing technology-based laser beam combining method |
| CN105699954A (en) * | 2014-11-24 | 2016-06-22 | 中国航空工业集团公司雷华电子技术研究所 | Optical domain reflection-based miniaturized tunable photoelectric time delay network structure |
| CN106130723A (en) * | 2016-08-19 | 2016-11-16 | 浙江神州量子网络科技有限公司 | There is the quantum key distribution system of actively monitoring function |
| CN106161009A (en) * | 2016-08-19 | 2016-11-23 | 浙江神州量子网络科技有限公司 | Quantum key distribution system based on coding time phase and encoding apparatus and decoding apparatus |
| CN106161011A (en) * | 2016-08-19 | 2016-11-23 | 浙江神州量子网络科技有限公司 | A kind of plug and play quantum key dissemination system based on coding time phase and method and transmitting terminal and receiving terminal |
| CN106506096A (en) * | 2016-10-31 | 2017-03-15 | 四川航天机电工程研究所 | A kind of unequal arm interference ring and quantum key dispatching system |
| CN106817174A (en) * | 2016-12-19 | 2017-06-09 | 北京大学 | Channel multiplexing device based on two-way plug and play QKD system |
| CN107437966A (en) * | 2017-08-08 | 2017-12-05 | 安徽问天量子科技股份有限公司 | Both ends polarization state initial method based on phase-modulated polarized state coding QKD system |
| CN107979463A (en) * | 2018-01-22 | 2018-05-01 | 中国科学技术大学 | A kind of phase codec and quantum key dispatching system |
| CN108540282A (en) * | 2018-05-02 | 2018-09-14 | 如般量子科技有限公司 | HD-QKD systems based on Polarization Modulation time encoding |
| CN109343173A (en) * | 2018-12-06 | 2019-02-15 | 安徽问天量子科技股份有限公司 | A kind of interferometer that hybrid waveguide is integrated |
| CN109391471A (en) * | 2018-10-15 | 2019-02-26 | 中国科学技术大学 | A kind of hybrid waveguide integrated interferometer and quantum key dispatching system |
| CN110460388A (en) * | 2019-06-18 | 2019-11-15 | 中国电子科技集团公司电子科学研究院 | Time phase decoding apparatus and quantum key distribution system including it |
| WO2020088411A1 (en) * | 2018-10-29 | 2020-05-07 | 中国电子科技集团公司电子科学研究院 | Quantum key distribution phase decoding method and apparatus, and corresponding system |
| WO2020088412A1 (en) * | 2018-10-29 | 2020-05-07 | 中国电子科技集团公司电子科学研究院 | Time bit-phase decoding method and device for quantum key distribution, and corresponding system |
| CN111239896A (en) * | 2020-03-26 | 2020-06-05 | 北京爱杰光电科技有限公司 | Active polarization rotator realized based on mixed surface plasma groove waveguide |
| CN111337052A (en) * | 2020-03-20 | 2020-06-26 | 北京世维通光智能科技有限公司 | Y waveguide parameter measuring instrument, measuring system and measuring method |
| CN111555871A (en) * | 2020-04-29 | 2020-08-18 | 中国科学院半导体研究所 | Reconfigurable receiving chip for quantum key distribution |
| CN111585755A (en) * | 2020-04-29 | 2020-08-25 | 中国科学院半导体研究所 | Multi-protocol compatible quantum key distribution decoding integrated chip with configurable on-chip unit |
| CN113324485A (en) * | 2021-05-26 | 2021-08-31 | 国开启科量子技术(北京)有限公司 | Arm length difference measuring system of unequal arm interferometer |
| CN113572562A (en) * | 2021-03-02 | 2021-10-29 | 华南师范大学 | Transmitting device and receiving device of wavelength division multiplexing polarization compensation system |
| US11327233B2 (en) | 2016-09-27 | 2022-05-10 | Huawei Technologies Co., Ltd. | Encoding apparatus using same polarization modes, and quantum key distribution device and system based on same |
| CN114584224A (en) * | 2022-04-28 | 2022-06-03 | 杭州慧明量子通信技术有限公司 | Quantum key distribution phase encoding device |
| TWI828111B (en) * | 2021-09-29 | 2024-01-01 | 國立中央大學 | Adiabatic coupling phase modulation modules, devices and quantum key distribution systems |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2254767C (en) * | 1996-05-22 | 2002-04-16 | British Telecommunications Public Limited Company | Method and apparatus for polarisation-insensitive quantum cryptography |
| ES2215238T3 (en) * | 1996-09-05 | 2004-10-01 | Swisscom Ag | DEVICE AND PROCEDURE FOR QUANTIC CRYPTOGRAPHY. |
| US6188768B1 (en) * | 1998-03-31 | 2001-02-13 | International Business Machines Corporation | Autocompensating quantum cryptographic key distribution system based on polarization splitting of light |
-
2004
- 2004-02-02 CN CN2009101319808A patent/CN101571612B/en not_active Expired - Lifetime
Cited By (44)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101800636B (en) * | 2010-02-04 | 2012-07-25 | 安徽量子通信技术有限公司 | Synchronizer and synchronization method for quantum key distribution |
| CN102368705A (en) * | 2011-11-14 | 2012-03-07 | 中国科学技术大学 | Attacking method for polarization coded quantum key distribution system |
| CN103475425A (en) * | 2013-07-26 | 2013-12-25 | 华东师范大学 | Single photon source based on Faraday-Sagnac loop and realization method thereof |
| CN103475425B (en) * | 2013-07-26 | 2016-08-31 | 华东师范大学 | The implementation method of single-photon source based on faraday-Sagnac loop |
| CN103986527A (en) * | 2014-06-06 | 2014-08-13 | 中国科学技术大学 | High-speed low-voltage phase modulation method |
| CN103986527B (en) * | 2014-06-06 | 2016-08-17 | 中国科学技术大学 | A kind of high speed low voltage phase modulating method |
| CN105699954A (en) * | 2014-11-24 | 2016-06-22 | 中国航空工业集团公司雷华电子技术研究所 | Optical domain reflection-based miniaturized tunable photoelectric time delay network structure |
| CN104579641A (en) * | 2014-12-24 | 2015-04-29 | 上海理工大学 | Phase encoding device in quantum communication system |
| CN105486483A (en) * | 2016-01-11 | 2016-04-13 | 北京中科思远光电科技有限公司 | Spatial and temporal multiplexing technology-based laser beam combining method |
| CN106130723A (en) * | 2016-08-19 | 2016-11-16 | 浙江神州量子网络科技有限公司 | There is the quantum key distribution system of actively monitoring function |
| CN106161009A (en) * | 2016-08-19 | 2016-11-23 | 浙江神州量子网络科技有限公司 | Quantum key distribution system based on coding time phase and encoding apparatus and decoding apparatus |
| CN106161011A (en) * | 2016-08-19 | 2016-11-23 | 浙江神州量子网络科技有限公司 | A kind of plug and play quantum key dissemination system based on coding time phase and method and transmitting terminal and receiving terminal |
| CN106161011B (en) * | 2016-08-19 | 2022-11-15 | 浙江神州量子网络科技有限公司 | Plug-and-play quantum key distribution system and method based on time-phase coding, sending end and receiving end |
| CN106161009B (en) * | 2016-08-19 | 2023-05-05 | 浙江神州量子网络科技有限公司 | Quantum key distribution system based on time-phase encoding |
| US11327233B2 (en) | 2016-09-27 | 2022-05-10 | Huawei Technologies Co., Ltd. | Encoding apparatus using same polarization modes, and quantum key distribution device and system based on same |
| WO2018076831A1 (en) * | 2016-10-31 | 2018-05-03 | 四川航天机电工程研究所 | Unequal-arm interference ring and quantum key distribution system |
| CN106506096B (en) * | 2016-10-31 | 2018-08-07 | 四川航天机电工程研究所 | A kind of unequal arm interference ring and quantum key dispatching system |
| CN106506096A (en) * | 2016-10-31 | 2017-03-15 | 四川航天机电工程研究所 | A kind of unequal arm interference ring and quantum key dispatching system |
| CN106817174B (en) * | 2016-12-19 | 2022-10-11 | 北京大学 | Channel multiplexing device based on double-circuit plug-and-play QKD system |
| CN106817174A (en) * | 2016-12-19 | 2017-06-09 | 北京大学 | Channel multiplexing device based on two-way plug and play QKD system |
| CN107437966A (en) * | 2017-08-08 | 2017-12-05 | 安徽问天量子科技股份有限公司 | Both ends polarization state initial method based on phase-modulated polarized state coding QKD system |
| CN107437966B (en) * | 2017-08-08 | 2019-08-09 | 安徽问天量子科技股份有限公司 | Both ends polarization state initial method based on phase-modulated polarized state coding QKD system |
| CN107979463A (en) * | 2018-01-22 | 2018-05-01 | 中国科学技术大学 | A kind of phase codec and quantum key dispatching system |
| CN107979463B (en) * | 2018-01-22 | 2020-06-26 | 中国科学技术大学 | Phase encoder-decoder and quantum key distribution system |
| CN108540282A (en) * | 2018-05-02 | 2018-09-14 | 如般量子科技有限公司 | HD-QKD systems based on Polarization Modulation time encoding |
| CN109391471A (en) * | 2018-10-15 | 2019-02-26 | 中国科学技术大学 | A kind of hybrid waveguide integrated interferometer and quantum key dispatching system |
| CN109391471B (en) * | 2018-10-15 | 2021-07-06 | 中国科学技术大学 | Hybrid waveguide integrated interferometer and quantum key distribution system |
| WO2020088412A1 (en) * | 2018-10-29 | 2020-05-07 | 中国电子科技集团公司电子科学研究院 | Time bit-phase decoding method and device for quantum key distribution, and corresponding system |
| WO2020088411A1 (en) * | 2018-10-29 | 2020-05-07 | 中国电子科技集团公司电子科学研究院 | Quantum key distribution phase decoding method and apparatus, and corresponding system |
| US20210385078A1 (en) * | 2018-10-29 | 2021-12-09 | China Academy Of Electronics And Information Technology Of Cetc | Phase decoding method and apparatus for quantum key distribution, and corresponding system |
| CN109343173B (en) * | 2018-12-06 | 2023-08-25 | 安徽问天量子科技股份有限公司 | Hybrid waveguide integrated interferometer |
| CN109343173A (en) * | 2018-12-06 | 2019-02-15 | 安徽问天量子科技股份有限公司 | A kind of interferometer that hybrid waveguide is integrated |
| CN110460388A (en) * | 2019-06-18 | 2019-11-15 | 中国电子科技集团公司电子科学研究院 | Time phase decoding apparatus and quantum key distribution system including it |
| CN111337052A (en) * | 2020-03-20 | 2020-06-26 | 北京世维通光智能科技有限公司 | Y waveguide parameter measuring instrument, measuring system and measuring method |
| CN111337052B (en) * | 2020-03-20 | 2024-03-22 | 北京世维通光智能科技有限公司 | Y waveguide parameter measuring instrument, measuring system and measuring method |
| CN111239896A (en) * | 2020-03-26 | 2020-06-05 | 北京爱杰光电科技有限公司 | Active polarization rotator realized based on mixed surface plasma groove waveguide |
| CN111555871B (en) * | 2020-04-29 | 2021-03-26 | 中国科学院半导体研究所 | Reconfigurable receiving chip for quantum key distribution |
| CN111585755A (en) * | 2020-04-29 | 2020-08-25 | 中国科学院半导体研究所 | Multi-protocol compatible quantum key distribution decoding integrated chip with configurable on-chip unit |
| CN111555871A (en) * | 2020-04-29 | 2020-08-18 | 中国科学院半导体研究所 | Reconfigurable receiving chip for quantum key distribution |
| CN113572562A (en) * | 2021-03-02 | 2021-10-29 | 华南师范大学 | Transmitting device and receiving device of wavelength division multiplexing polarization compensation system |
| CN113572562B (en) * | 2021-03-02 | 2023-07-28 | 华南师范大学 | Transmitting device and receiving device of wavelength division multiplexing polarization compensation system |
| CN113324485A (en) * | 2021-05-26 | 2021-08-31 | 国开启科量子技术(北京)有限公司 | Arm length difference measuring system of unequal arm interferometer |
| TWI828111B (en) * | 2021-09-29 | 2024-01-01 | 國立中央大學 | Adiabatic coupling phase modulation modules, devices and quantum key distribution systems |
| CN114584224A (en) * | 2022-04-28 | 2022-06-03 | 杭州慧明量子通信技术有限公司 | Quantum key distribution phase encoding device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101571612B (en) | 2012-12-26 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101571612B (en) | Polarization controlling encoder | |
| CN1651947A (en) | Polarization control coding method coder and quantum key distributing system | |
| Muller et al. | “Plug and play” systems for quantum cryptography | |
| CN101053186B (en) | System and method for providing two-way communication of quantum signals, timing signals, and public data | |
| US6188768B1 (en) | Autocompensating quantum cryptographic key distribution system based on polarization splitting of light | |
| US7227955B2 (en) | Single-photon watch dog detector for folded quantum key distribution system | |
| CA2265553C (en) | Quantum cryptography device and method | |
| CN108650091B (en) | Phase decoding method, phase decoding receiving device and quantum key distribution system | |
| CN101150371B (en) | A quanta secret key distribution system for phase coding polarization detection | |
| CN100403152C (en) | Two-way QKD system with backscattering suppression | |
| US20040208638A1 (en) | Communication system using entangled photons | |
| US20090180615A1 (en) | Qkd stations with fast optical switches and qkd systems using same | |
| US11451308B1 (en) | Quantum communications system having pulses divided into time bins and associated methods | |
| RU2507690C1 (en) | Method for quantum encoding and transmission of cryptographic keys | |
| CN114629563B (en) | Polarization multiplexing quantum key distribution device and full-time full-pass quantum key distribution network | |
| CN104579641A (en) | Phase encoding device in quantum communication system | |
| JP5003142B2 (en) | Polarization coding-phase coding converter and quantum communication system using the same | |
| US20050189478A1 (en) | Compact optics assembly for a QKD station | |
| CN110752882A (en) | Low-bit-error-rate phase coding system and receiving end thereof | |
| EP1522166B1 (en) | Watch dog detector for qkd system | |
| Townsend et al. | Secure optical communications systems using quantum cryptography | |
| CN115883089B (en) | Polarization selective phase modulation interferometer, quantum key distribution device, system and network | |
| CN117459153B (en) | Optical fiber channel eavesdropping detection device | |
| WO2023207573A1 (en) | Miniaturized time phase decoder and qkd receiver | |
| Nambu et al. | Planar lightwave circuits for quantum cryptographic systems |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: USTC HOLDINGS CO., LTD. Free format text: FORMER OWNER: UNIVERSITY OF SCIENCE AND TECHNOLOGY OF CHINA Effective date: 20150707 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20150707 Address after: 230026, No. 19, South, Hi Tech Plaza, 92 Jinzhai Road, Anhui, Hefei Patentee after: USTC Asset Management Co.,Ltd. Address before: 230026 Jinzhai Road, Anhui, China, No. 96, No. Patentee before: University of Science and Technology of China |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20151028 Address after: 241000 Anhui Province, Wuhu City asan road hi tech Development Zone Yusheng business center Patentee after: ANHUI ASKY QUANTUM TECHNOLOGY Co.,Ltd. Address before: 230026, No. 19, South, Hi Tech Plaza, 92 Jinzhai Road, Anhui, Hefei Patentee before: USTC Asset Management Co.,Ltd. |
|
| CX01 | Expiry of patent term |
Granted publication date: 20121226 |
|
| CX01 | Expiry of patent term |