CN208285324U - A kind of changeable polymorphic type quantum Terminal communication system - Google Patents
A kind of changeable polymorphic type quantum Terminal communication system Download PDFInfo
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- CN208285324U CN208285324U CN201820899730.3U CN201820899730U CN208285324U CN 208285324 U CN208285324 U CN 208285324U CN 201820899730 U CN201820899730 U CN 201820899730U CN 208285324 U CN208285324 U CN 208285324U
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Abstract
The utility model provides a kind of changeable polymorphic type quantum Terminal communication system, including several quantum terminals, several optical add/drop multiplexers, network service terminal and control group；The quantum terminal is correspondingly connected with by optical fiber and optical add/drop multiplexer；It is connect by bus with network service terminal between several described optical add/drop multiplexers；The quantum terminal is quantum mail terminal, quantum voice terminal or quantum video terminal.Structure is simple, changeable polymorphic type quantum Terminal communication system easy to use, realizes that the polymorphic type of quantum terminal switches by control protocol selector and optical add/drop multiplexer, so that this system type of service is no longer single.
Description
Technical field
The utility model relates to quantum informations and technical field of photo communication, and in particular to a kind of changeable polymorphic type quantum is whole
Hold communication system.
Background technique
Quantum key distribution (QKD, Quantum Key Distribution) is to realize there is height using quantum effect
The quanta cryptology technique of safety is the research hotspot of current international quantum physics and information science.Compared to traditional secrecy
The communication technology, quantum secret communication are communicated based on quantum-mechanical basic principle or characteristic, i.e. quantum uncertainty principle
It ensure that the theoretic unconditional security of quantum secret communication with unclonable theorem etc..
From Bennett and Brassard since first in 1984 is about the paper of QKD, and first set is built
QKD experimental system, to demonstrate how using BB84 agreement between two communication parties safely shared key, there is transmission distance
From the problems such as short, key rate is low.Hereafter, global researchers continuously improve, improve the experimental technique of QKD, at present
Until realized the QKD of 200~300km distance.At the same time, all kinds of different QKD agreements are proposed in succession, such as SARG04
Agreement, trick state agreement etc..
Due to the difference of communication environment and transmission medium, it is broadly divided into optical fiber QKD system and space QKD system two major classes,
Wherein fibre system is more suitable for and builds terrestrial communication networks, such as local area network, Metropolitan Area Network (MAN) etc..In order to save fiber resource and net
Network construction cost, using WDM, (Wavelength Division Multiplexing, wavelength-division are multiple in many optical fiber QKD systems
With) clock light and information light is incorporated to same optical fiber transmission building QKD network by technology, such as Switzerland's quantum, Tokyo QKD and Vienna
Multiple quantum communications Experimental Networks such as SECOQC.
Currently, optical fiber QKD network system is mainly a kind of QKD agreement of a QKD system regular collocation, there is the net of enough numbers
Network user and type of user terminal is single.How by quantum terminal, according to the difference of terminal traffic demand, (such as transmission code rate is transmitted
Distance etc.) switching is realized in the same optical fiber QKD network system, maximally utilizing the grid resource is a challenge.
Utility model content
Changeable polymorphic type quantum terminal simple, easy to use that the purpose of this utility model is to provide a kind of structures is logical
Letter system realizes that the polymorphic type of quantum terminal switches by control protocol selector and optical add/drop multiplexer, so that this system industry
Service type is no longer single.
To achieve the goals above, the utility model provides a kind of changeable polymorphic type quantum Terminal communication system, specifically
Technical solution is as follows:
A kind of changeable polymorphic type quantum Terminal communication system, including several quantum terminals, several optical add/drop multiplexer
Device, network service terminal and control group；
The quantum terminal is correspondingly connected with by optical fiber and optical add/drop multiplexer；Between several described optical add/drop multiplexers
It is connect by bus with network service terminal.
Preferably, the quantum terminal is quantum mail terminal, quantum voice terminal or quantum video terminal.
Preferably, the quantum terminal includes adjustable attenuator, phase-modulator and faraday mirror.
Preferably, the adjustable attenuator is connect with phase-modulator, and the phase-modulator is connect with faraday mirror.
Specifically, the main function of the optical add/drop multiplexer is separated or is inserted into from multi-wavelength channel for quantum terminal
One or more wavelength, and according to the difference of quantum terminal type, specific communication wavelengths are set therewith；
Preferably, the network service terminal includes protocol selector, tunable laser, circulator, single-photon detecting
Survey device, coupler, non-equilibrium interferometer, phase-modulator, polarization beam apparatus and Polarization Control；
Preferably, QKD agreement (QKD, Quantum Key Distribution, quantum may be selected in the protocol selector
Key distribution).
Preferably, the QKD agreement can be BB84 agreement, SARG04 agreement or inveigle state agreement.
Specifically, the selection of different agreement, different transmission range and transmission can be achieved in the case where guaranteeing the bit error rate
Key rate.
Preferably, the control group selects the agreement of network service terminal by control protocol selector；
Preferably, the control group selects the communication wavelengths of quantum terminal by control optical add/drop multiplexer, realizes different
The quantum terminal of type switches；(such as quantum mail terminal is switched to quantum video terminal).
Specifically, the selection of agreement is the communication distance and quantum according to quantum service terminal to network service terminal
Requirement of the terminal to cipher key delivery rate codetermines.
Compared with prior art, the beneficial effect of technical solutions of the utility model is:
It (1) can be to the specific wavelength of polymorphic type quantum terminal distribution using OADM device, it is ensured that terminal switching
It is accurate, while network user end appropriate can be added in bus links by OADM device, maximize benefit
With the Internet resources of the system；
(2) protocol selector can provide a variety of QKD agreements, by control group, not according to quantum terminal traffic demand
With (such as terminal there are different requirements to code rate, transmission range), the perfect matching of QKD agreement and quantum terminal is realized；
(3) this system using two-channel structure and has used Polarization Control and faraday mirror, can be existed with automatic compensating signal
The phase fluctuation that introduces in transmission process, polarization drift compensation, system are more stable.
Detailed description of the invention
Fig. 1 is a kind of overall structure block diagram of changeable polymorphic type quantum Terminal communication system of the utility model；
Fig. 2 is that a kind of ALICE quantum terminal structure of changeable polymorphic type quantum Terminal communication system of the utility model shows
It is intended to；
Fig. 3 is a kind of BOB network service terminal structure of changeable polymorphic type quantum Terminal communication system of the utility model
Schematic diagram；
Fig. 4 is a kind of concrete structure schematic diagram of changeable polymorphic type quantum Terminal communication system of the utility model.
Specific embodiment
Specific embodiment of the present utility model is described further with reference to the accompanying drawing.
The present embodiment describes the specific embodiment of the utility model by taking BB84 agreement as an example；Fig. 4 be the present embodiment in,
The detailed process of information transmitting.
As shown in Figs 1-4, a kind of changeable polymorphic type quantum Terminal communication system, including three ALICE quantum terminals, three
A optical add/drop multiplexer OADM, BOB network service terminal and control group；
Three ALICE quantum terminal is respectively ALICE quantum mail terminal, ALICE quantum voice terminal, ALICE
Quantum video terminal
The ALICE quantum mail terminal, ALICE quantum voice terminal, ALICE quantum video terminal pass through optical fiber respectively
It connects one to one with three optical add/drop multiplexer OADM；Pass through bus and BOB network between the optical add/drop multiplexer OADM
Service terminal connection.
The ALICE quantum mail terminal, ALICE quantum voice terminal, ALICE quantum video terminal includes can darkening
Attenuator A, phase-modulator PMA and faraday mirror FM.
The BOB network service terminal includes protocol selector, tunable laser, circulator, two single-photon detectings
Survey device D1 and D2,50/50 coupler, non-equilibrium interferometer, phase-modulator PMB, polarization beam apparatus and Polarization Control PC.
As shown in figure 4, BOB network service terminal is ISP, it is used to generate the optical signal pulses of coded key,
The quantum terminal of network is assigned them to simultaneously, and when pulse returns to BOB network service terminal, detects these arteries and veins again
Punching.
BOB network service terminal is equipped with a tunable laser, and the tunable laser is for generating difference
The laser of wavelength passes through circulator, and then in coupler locations, light pulse is divided into two beams up and down, and two-beam pulse can all be declined
Subtract device and successively reach quantum terminal, then reflected by faraday mirror FM, reflected light pulse under the action of polarization beam apparatus,
So that upper and lower two-beam pulse switching path returns to coupler and interferes, two InGaAs/InP snowslide single photon detections are triggered
Device D1 and D2 is responded；
The detector D1 and D2 is cooled to -55 DEG C, and runs in Geiger mode angular position digitizer；
The non-equilibrium interferometer is unbalanced Mach-Zehnder interferometer, and the interferometer upper arm is equipped with phase-modulation
Device PMB and delay line DL；
The phase-modulator PMB drives signal by the electricity for inputting correct level to modulator to provide π/4 or-π/4
Phase shift；
The interferometer lower arm has Polarization Control PC and polarization beam apparatus；
In the system, each ALICE quantum terminal connects a passive optical add/drop multiplexer OADM, the quantum terminal
Including variable optical attenuator A, lithium niobate phase modulator PMA and faraday's reflecting mirror FM；
The phase-modulator PMA of ALICE quantum terminal is controlled by voltage, and each PMA provides four different phases
It moves:-π/4 ,+π/4 ,+3 π/4 and -3 π/4.
Each type quantum terminal (such as quantum mail terminal, quantum video terminal or quantum voice terminal) is assigned only
One address (i.e. wavelength channel), for being communicated with the foundation of ISP's BOB network service terminal.
Optical add/drop multiplexer OADM passes through the photon transmission of specified address wavelength to corresponding quantum terminal, and allows institute
There is the photon of other wavelength along optical-fibre channel reflected frontward, to achieve the purpose that wavelength relative photon router.
BOB network service terminal starts encryption key distribution by sending optical signal pulses with desired address wavelength；Each
Pulse is divided into two at coupler and passes through an arm of interferometer.
The signal that the interferometer upper arm passes through is delayed by line DL delay, and inclined by the signal of lower arm Polarization Control PC
Vibration is rotated by 90 °.
It is coupled in Fiber quantum channel with latter two signal by polarization beam apparatus PBS, and passes through its OADM to forward pass
It is multicast to expected ALICE quantum terminal.
The value of settable its adjustable attenuator A of ALICE quantum terminal carrys out deamplification to required average photon number, may be used also
Random phase shift is applied to go-ahead signal pulse using PMA, optical signal is reflected back OADM by faraday's reflecting mirror FM, and OADM again will
Signal is transmitted back to BOB network service terminal.
FM makes the polarization of output signal and the polarized orthogonal of input signal, and therefore, signal is entered by the arm of BOB interferometer
The path initially entered with them after through same optical path at CP on the contrary, and reconfigure；
In addition, FM also compensates for any polarization correlated of the birefringent and optical element in Fiber quantum channel.BOB net
Network service terminal in identical pulse using any one phase shift PMB setting only when signal is returned by randomly detecting
The phase shift that ALICE quantum terminal applies optical signal.
When the phase shift summation that BOB network service terminal and ALICE quantum terminal apply is equal to zero, photon passes through annular
Device is routed to single-photon detector D1.If phase shift summation is ± π, single-photon detector D2 is gone to.
BOB network service terminal can be by simply by the wavelength tuning of signal pulse to distributing in this way
The specific wavelength value of polymorphic type quantum terminal carrys out each quantum terminal on addressable network, while by control group according to ALICE
The type of service of quantum terminal selects corresponding QKD agreement and OADM, realizes the switching of quantum terminal different business.
According to the disclosure and teachings of the above specification, the utility model those skilled in the art can also be to above-mentioned reality
The mode of applying is changed and is modified.Therefore, the utility model is not limited to specific embodiment disclosed and described above, right
Some modifications and changes of utility model should also be as falling into the protection scope of the claims of the present utility model.In addition, although
It is used some specific terms in this specification, these terms are merely for convenience of description, not to the utility model structure
At any restrictions.
Claims (8)
1. a kind of changeable polymorphic type quantum Terminal communication system, it is characterised in that: the system comprises several quantum terminals,
Several optical add/drop multiplexers, network service terminal and control group；
Each described quantum terminal is correspondingly connected with by optical fiber and optical add/drop multiplexer；
It is connect by bus with network service terminal between several described optical add/drop multiplexers；
The optical add/drop multiplexer is used to separate or be inserted into from multi-wavelength channel for quantum terminal one or more wavelength, and
According to the difference of quantum terminal type, specific communication wavelengths are set therewith.
2. a kind of changeable polymorphic type quantum Terminal communication system according to claim 1, it is characterised in that: the quantum
Terminal is quantum mail terminal, quantum voice terminal or quantum video terminal.
3. a kind of changeable polymorphic type quantum Terminal communication system according to claim 1, it is characterised in that: the quantum
Terminal includes adjustable attenuator, phase-modulator and faraday mirror；
The adjustable attenuator is connect with phase-modulator, and the phase-modulator is connect with faraday mirror.
4. a kind of changeable polymorphic type quantum Terminal communication system according to claim 1, it is characterised in that: the network
Service terminal includes protocol selector, tunable laser, circulator, single-photon detector, coupler, non-equilibrium interference
Instrument, phase-modulator, polarization beam apparatus and Polarization Control.
5. a kind of changeable polymorphic type quantum Terminal communication system according to claim 4, it is characterised in that: the agreement
QKD agreement may be selected in selector.
6. a kind of changeable polymorphic type quantum Terminal communication system according to claim 5, it is characterised in that: the QKD
Agreement is BB84 agreement, SARG04 agreement or trick state agreement.
7. a kind of changeable polymorphic type quantum Terminal communication system according to claim 1, it is characterised in that: the control
Group control protocol selector, selects the agreement of network service terminal.
8. a kind of changeable polymorphic type quantum Terminal communication system according to claim 1, it is characterised in that: the control
The communication wavelengths of group control optical add/drop multiplexer selection quantum terminal.
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| CN201820899730.3U CN208285324U (en) | 2018-06-11 | 2018-06-11 | A kind of changeable polymorphic type quantum Terminal communication system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108540286A (en) * | 2018-06-11 | 2018-09-14 | 华南师范大学 | A kind of changeable polymorphic type quantum terminal network communication system and method for distributing key |
| CN116170081A (en) * | 2023-04-26 | 2023-05-26 | 军事科学院系统工程研究院网络信息研究所 | Quantum communication protocol automatic switching method based on link perception |
-
2018
- 2018-06-11 CN CN201820899730.3U patent/CN208285324U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108540286A (en) * | 2018-06-11 | 2018-09-14 | 华南师范大学 | A kind of changeable polymorphic type quantum terminal network communication system and method for distributing key |
| CN108540286B (en) * | 2018-06-11 | 2023-12-05 | 广东尤科泊得科技发展有限公司 | Switchable multi-type quantum terminal network communication system and key distribution method |
| CN116170081A (en) * | 2023-04-26 | 2023-05-26 | 军事科学院系统工程研究院网络信息研究所 | Quantum communication protocol automatic switching method based on link perception |
| CN116170081B (en) * | 2023-04-26 | 2023-08-04 | 中国人民解放军军事科学院系统工程研究院 | Quantum communication protocol automatic switching method based on link perception |
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Effective date of registration: 20210318 Address after: 510663 room A105, first floor, ladder a, No. 11, panglv Road, Science City, Guangzhou high tech Industrial Development Zone, Guangdong Province Patentee after: Guangdong Yukopod Technology Development Co.,Ltd. Address before: College of information and optoelectronics, South China Normal University, No. 378, Waihuan West Road, Panyu District, Guangzhou, Guangdong Province, 510006 Patentee before: SOUTH CHINA NORMAL University |
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