CN108650084A - Quantum safety direct communication method based on entangled photon pairs and system - Google Patents
Quantum safety direct communication method based on entangled photon pairs and system Download PDFInfo
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- CN108650084A CN108650084A CN201810436749.9A CN201810436749A CN108650084A CN 108650084 A CN108650084 A CN 108650084A CN 201810436749 A CN201810436749 A CN 201810436749A CN 108650084 A CN108650084 A CN 108650084A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L9/00—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols
- H04L9/08—Key distribution or management, e.g. generation, sharing or updating, of cryptographic keys or passwords
- H04L9/0816—Key establishment, i.e. cryptographic processes or cryptographic protocols whereby a shared secret becomes available to two or more parties, for subsequent use
- H04L9/0852—Quantum cryptography
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/70—Photonic quantum communication
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L9/00—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols
- H04L9/08—Key distribution or management, e.g. generation, sharing or updating, of cryptographic keys or passwords
- H04L9/0816—Key establishment, i.e. cryptographic processes or cryptographic protocols whereby a shared secret becomes available to two or more parties, for subsequent use
- H04L9/0852—Quantum cryptography
- H04L9/0858—Details about key distillation or coding, e.g. reconciliation, error correction, privacy amplification, polarisation coding or phase coding
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Abstract
The invention discloses a kind of quantum safety direct communication method and system based on entangled photon pairs, including source, data sending terminal and data receiver are tangled, data sending terminal includes：First polarization beam apparatus, the first faraday rotator mirror and controllable photoswitch, one of controllable photoswitch output end are connected with the second faraday rotator mirror, and controllable photoswitch obtains the quantum bit sent from data source；Data receiver includes sequentially connected second polarization beam apparatus, third polarization beam apparatus and the 4th polarization beam apparatus, and two output ends of the 4th polarization beam apparatus are separately connected a single photon detector；Multiple sources of tangling generate multiple entangled photon pairs, one photon of entangled photons centering will be sent to data sending terminal through wave multiplexer, another photon is sent to data receiver through wave multiplexer, and the quantum bit received is determined according to the photon numbers that single photon detector detects.The transmission of information is not directed through communication line in the present invention, and information transmission safety is high.
Description
Technical field
The present invention relates to Technique on Quantum Communication field more particularly to a kind of quantum safety based on entangled photon pairs are directly logical
Believe method and system.
Background technology
Optical communication net has become most important communication network, and optical communication network is providing large capacity, high band to the user
When wide communication mode, it is also faced with increasingly severe network security problem, wherein how to ensure that the communication information is not stolen
Destruction is listened, replicated and forged, realizes that safe information communication becomes a huge challenge.And utilize quantum quantum mechanics
Principle and various Quantum Properties realize that quantum communications can will effectively ensure the safety of the communication information.
The generation and distribution of quantum key are mainly realized in quantum communications at present by quantum techniques, then are encrypted by quantum key
Information and by classical information channel transfer, and the technological development of Quantum Secure Direct Communication and research are not yet practical.Quantum
Secure direct communication refers to communicating pair using quantum state as information carrier, using principle of quantum mechanics and various Quantum Properties, is led to
Quantum channel is crossed, safe between communicating pair, dead-tight direct transmission effective information especially transmits confidential information
Method.Quantum Secure Direct Communication without generating quantum key, can direct safe transmission confidential information, improve communication effect
Rate.Similar with quantum communications password, the safety of Quantum Secure Direct Communication is also by the uncertainty relation in quantum mechanics
With the Quantum Properties such as the relevance and nonlocality of non-reproduction and entangled photons come what is ensured, safety is embodied in eavesdropping
Person cannot get any confidential information.Different from quantum key distribution, quantum key distribution is required to detect listener-in, abandons
Communication process, and what Quantum Secure Direct Communication was transmitted is information, it is desirable that information, such Quantum Secure Direct Communication cannot be revealed
Requirement be just higher than quantum key distribution.Therefore, quantum safety direct communication method can be used for the distribution of quantum key, instead
Not so.
Quantum Secure Direct Communication needs to meet two requirements：1. recipient receives the quantum state as information carrier
Afterwards, the confidential information that sender sends out can be directly read, without exchanging additional classical auxiliary information with sender；2.
Even if listener-in cannot get any confidential information if having eavesdropped quantum channel.
Method based on Quantum Secure Direct Communication mainly has：Ping-Pong Quantum Secure Direct Communications agreement, two step amounts
Sub- secure direct communication agreement, the QSDC agreements etc. based on single photon.However, the above communication means be required for data reception and
The mutual interactive measurement result to light quantum of sender, and the transmission of measurement result will be completed by classical communication channel.It adopts
Need reciprocally negotiating between sender and recipient that could complete with the transmission process of the above several method, data.
Invention content
It is an object of the invention to overcome deficiency in the prior art, a kind of quantum safety based on entangled photon pairs is provided
Direct communication method and system solve Quantum Secure Direct Communication in the prior art and need mutually to assist between sender and recipient
Quotient could complete to lead to the technical problem that information transfer efficiency is low, safety is not high.
In order to solve the above technical problems, the technical solution adopted in the present invention is：Quantum safety based on entangled photon pairs
Direct communication method, includes the following steps：
The mutually orthogonal entangled photon pairs of multiple polarization states are prepared, one of each entangled photons centering photon is sorted
It is sent to data sending terminal through the first wave multiplexer, another photon is sent to data receiver through the second wave multiplexer；
Data sending terminal sorts a branch of photon by the first polarization beam apparatus from the photon beam received, is set as S1 hair；
Data receiver sorts a branch of photon by the second polarization beam apparatus from the photon beam received, is set as S1 receives, light
Beamlet S1 hairWith photon beam S1 receivesIn Entangled State；
Data sending terminal is by S1 hairPolarization direction is rotated by 90 °, and is set as S2 hairs, and by S2 hairsIt is sent to controllable photoswitch, controllable light
It switchs from data source and reads the quantum bit for needing to send, the quantum bit control switching position sent as needed makes
S2 hairsHolding polarization state is constant or polarization state is rotated by 90 °；
Data receiver is by third polarization beam apparatus from photon beam S1 receivesThe middle a branch of photon of sorting, is set as S2 receive, photon beam
S2 hairsWith photon beam S2 receiveIn Entangled State；By the 4th polarization beam apparatus by photon beam S2 receive, it is set asWith
Two photon beams in statistics and more same periodWithPhoton numbers, it is true according to the photon numbers detected
Determine the quantum bit of data sending terminal transmission.
Further, data receiver receives the second wave multiplexer and sends the time lag of photon in data sending terminal reception
The time of photon is sent to the first wave multiplexer.
Further, determine that the method for the bit of data sending terminal transmission is as follows according to the photon numbers detected：
If detecting photon beamMiddle single photon quantity is more than photon beam1.5 times of middle single photon quantity, Huo Zheguang
BeamletMiddle single photon quantity is more than photon beam1.5 times of middle single photon quantity, then assert data sending terminal S2 hairsKeep inclined
Polarization state is constant or polarization state is rotated by 90 °, and to obtain the switching position of controllable photoswitch, further determines that data sending terminal is sent out
The bit sent；
If detecting photon beamMiddle single photon quantity is not more than photon beam1.5 times of middle single photon quantity, or
Photon beamMiddle single photon quantity is not more than photon beam1.5 times of middle single photon quantity, then ignore as error code.
The Quantum Secure Direct Communication system based on entangled photon pairs that the present invention also provides a kind of, including：
It is multiple to tangle source：It is used to prepare the mutually orthogonal entangled photon pairs of multiple polarization states；
First wave multiplexer：Photon transmission for being sorted from multiple entangled photons centerings is to data sending terminal；
Second wave multiplexer：Photon transmission for being sorted from multiple entangled photons centerings is to data receiver；
Data sending terminal：Including the first polarization beam apparatus, the first faraday rotator mirror, controllable photoswitch, the second method
Draw rotating mirror and data source；
First polarization beam apparatus is sorted from the photon beam that the first wave multiplexer exports a branch of is transmitted to the first Faraday rotation
Speculum, the first faraday rotator mirror are transmitted to controllable photoswitch after being rotated by 90 ° the photon beam polarization state received, can
Control photoswitch reads the bit for needing to send from the data source, and the bit control switching position sent as needed makes
The photon beam that controllable photoswitch receives keeps polarization state constant or is rotated by the second faraday rotator mirror polarization state
90°；
Data receiver：Including sequentially connected second polarization beam apparatus, third polarization beam apparatus and the 4th polarization beam splitting
Two output ends of device, the 4th polarization beam apparatus are connected separately with single photon detector；
Second polarization beam apparatus sorted from the photon beam that the second wave multiplexer exports it is a branch of be transmitted to third polarization beam apparatus,
Third polarization beam apparatus is sub-elected from the photon beam received a branch of is transmitted to the 4th polarization beam apparatus, the 4th polarization beam apparatus
The photon beam received is divided into two beams and is transmitted separately to two single photon detectors, the light detected according to two single photon detectors
Subnumber amount determines the quantum bit that data sending terminal is sent；
Wherein：The photon beam that the photon beam that first faraday rotator mirror receives is received with third polarization beam apparatus
In Entangled State；The photon beam that the photon beam and the 4th polarization beam apparatus that controllable photoswitch receives receive is in Entangled State.
Further, the photon that the first wave multiplexer will be sorted by the first single mode optical fiber channel from multiple entangled photons centerings
It is transferred to data sending terminal；
Second wave multiplexer is by the second single mode optical fiber channel by the photon transmission sorted from multiple entangled photons centerings to number
According to receiving terminal；
The length in the second single mode optical fiber channel is more than the length in the first single mode optical fiber channel.
Preferably, between the first polarization beam apparatus and the first faraday rotator mirror, the first faraday rotator mirror
It is connect respectively by polarization maintaining optical fibre between controllable photoswitch.
Further, the data sending terminal further includes first laser terminator, second laser terminator, the first polarization point
The photon beam for being not transferred to the first faraday rotator mirror sub-elected is transmitted to first laser terminator by beam device；
One output end of controllable photoswitch is connected to second laser terminator, and another output end is through the second Faraday rotation
Speculum is connected to second laser terminator.
Further, data receiver further includes third laser terminator, and the second polarization beam apparatus does not pass what is sub-elected
The photon beam for transporting to third polarization beam apparatus is transmitted to third laser terminator；Third polarization beam apparatus will sub-elect not simultaneously
The photon beam for being transmitted to the 4th polarization beam apparatus is also transmitted to third laser terminator.
Compared with prior art, the advantageous effect of the invention reached is：
The state (polarization state) that the present invention can directly measure light quantum by the recipient of data obtains the transmission sent
Data information；The measurement result of recipient is not necessarily to tell sender by other communication modes simultaneously；The guarantor of transmission data
Close property will be determined by the internal structure of recipient and transmission method, apparatus, increase the difficulty that attacker attacks transmission information；It is logical
It crosses the present invention and the direct secret communication on conventional fiber optic communication chain road may be implemented；It can also be used for the transmission of encryption key.
Description of the drawings
Fig. 1 is the structural schematic diagram of the Quantum Secure Direct Communication system provided by the invention based on entangled photon pairs；
Fig. 2 is the flow chart of the quantum safety direct communication method provided by the invention based on entangled photon pairs.
Specific implementation mode
Conventional optical communication line may be used in the present invention, and the mutually orthogonal entangled photons of polarization state are prepared using source of tangling
It is right, by multiple entangled photon pairs for tangling sources and preparing different polarization states combination respectively, by wave multiplexer by the one of photon centering
Group is transmitted to data sending terminal by optical fiber, and another group is transmitted to data receiver by optical fiber.Ensure the light of data receiver
Fibre is slightly longer than the optical fiber of data sending terminal, and data sending terminal is selected the photon of some polarization direction by polarization beam apparatus, is used in combination
Polarization maintaining optical fibre keeps its polarization direction；And data receiver is selected and number by the polarization beam apparatus orthogonal with data sending terminal
The entangled photons chosen according to transmitting terminal.Data sending terminal makes the polarization direction of photon be rotated by 90 ° with faraday rotator mirror, and
Keep polarization direction constant by polarization maintaining optical fibre；Data receiver selects entangled photons again by polarization beam apparatus again
It selects, to ensure the photon entanglement for loading data.Transmitting terminal photoswitch at regular intervals, two sent as needed into
The position of data switching switch processed so that photon transmits on different paths, so that the polarization direction of photon deflects 90 °
Or it remains unchanged；Receiving terminal uses polarization beam apparatus by the light of different polarization direction (polarization direction deflects 90 ° or remains unchanged)
Son is sent to corresponding single photon detector, detects the quantity that two beams input photon by each single photon detector, counts and compare
Two single photon detectors detect that the quantity of photon, the photon numbers such as detected are not much different in a period of time, then conduct
Error code is ignored, and such as counts on single photon quantity that some single photon detector detects than another single photon according to detection
To the single photon quantity that detects of detector it is big by 50% or more, then assert that transmitting terminal is to tangling corresponding to the single photon detector
The operation of photon is that polarization direction deflects 90 ° or remains unchanged, and then can obtain position and the transmitting terminal hair of switching switch
The binary data sent.
The invention will be further described below in conjunction with the accompanying drawings.Following embodiment is only used for clearly illustrating the present invention
Technical solution, and not intended to limit the protection scope of the present invention.
As shown in Figure 1, being that the structure of the Quantum Secure Direct Communication system provided by the invention based on entangled photon pairs is shown
Be intended to, including it is multiple tangle source, the first wave multiplexer, the second wave multiplexer, data sending terminal and data receiver, it is multiple to tangle sources use
In preparing the mutually orthogonal entangled photon pairs of multiple polarization states, the first wave multiplexer is tangled by the first single mode optical fiber channel by each
One photon of photon centering is distributed to data sending terminal, and the second wave multiplexer each tangles light by the second single mode optical fiber channel handle
Another photon of sub- centering is distributed to data receiver, and photon is received to make data receiver lag behind data sending terminal, the
The length in two single mode optical fiber channels should be greater than the length in the first single mode optical fiber channel.
Data sending terminal includes：First polarization beam apparatus, first laser terminator, the first faraday rotator mirror, can
Control photoswitch, the second faraday rotator mirror, second laser terminator and data source.The input terminal of first polarization beam apparatus is logical
It crosses optical fiber to connect with the output end of the first wave multiplexer, one of first polarization beam apparatus output end and first laser terminator
Input terminal connection, another output end connect by polarization maintaining optical fibre with the input terminal of the first faraday rotator mirror；First method
The output end of rotating mirror is drawn to be connect with the input terminal of controllable photoswitch by polarization maintaining optical fibre, one of controllable photoswitch opens
The input terminal of contact portion second laser terminator is closed, another switch contact swashs through the second faraday rotator mirror connection second
The input terminal of light terminator.Controllable photoswitch obtains the bit for needing to send from data source.
For data sending terminal, the first polarization beam apparatus sorts a branch of be transmitted to from the photon beam that the first wave multiplexer exports
First faraday rotator mirror, the first faraday rotator mirror transmit after being rotated by 90 ° the photon beam polarization state received
To controllable photoswitch, controllable photoswitch reads the bit for needing to send from data source, the bit control switch sent as needed
Switching position makes the photon beam that controllable photoswitch receives keep polarization state constant or inclined by the second faraday rotator mirror
Polarization state is rotated by 90 °.
Data receiver includes：Second polarization beam apparatus, third polarization beam apparatus, the 4th polarization beam apparatus, third laser
Terminator and two single photon detectors.The input terminal of second polarization beam apparatus is connected by the output end of optical fiber and the second wave multiplexer
It connects；The input terminal of the output end connection third polarization beam apparatus of second polarization beam apparatus, another output end connection third swash
The input terminal of light terminator；One output end of third polarization beam apparatus connects the input terminal of the 4th polarization beam apparatus, another defeated
Outlet connects the input terminal of third laser terminator；Two output ends of the 4th polarization beam apparatus are separately connected a singl e photon detection
Device.
For data receiver, the second polarization beam apparatus sorts a branch of be transmitted to from the photon beam that the second wave multiplexer exports
Third polarization beam apparatus, third polarization beam apparatus is sub-elected from the photon beam received a branch of is transmitted to the 4th polarization beam splitting
Device, the photon beam received is divided into two beams and is transmitted separately to two single photon detectors by the 4th polarization beam apparatus, according to two monochromatic lights
The photon numbers that sub- detector detects determine the bit that data sending terminal is sent.
Wherein：The photon beam that the photon beam that first faraday rotator mirror receives is received with third polarization beam apparatus
In Entangled State；The photon beam that the photon beam and the 4th polarization beam apparatus that controllable photoswitch receives receive is in Entangled State.
The present invention also provides a kind of quantum safety direct communication methods based on entangled photon pairs, using communication above-mentioned
System is realized, is included the following steps：
The mutually orthogonal entangled photon pairs of multiple polarization states are prepared, one of each entangled photons centering photon is sorted
It is sent to data sending terminal through the first wave multiplexer, another photon is sent to data receiver through the second wave multiplexer；Data receiver
Termination receive the second wave multiplexer send photon time lag in data sending terminal receive the first wave multiplexer send photon when
Between.
Data sending terminal sorts a branch of photon by the first polarization beam apparatus from the photon beam received, is set as S1 hair；
Data receiver sorts a branch of photon by the second polarization beam apparatus from the photon beam received, is set as S1 receives, light
Beamlet S1 hairWith photon beam S1 receivesIn Entangled State；
Data sending terminal is by S1 hairPolarization direction is rotated by 90 °, and is set as S2 hairs, and by S2 hairsIt is sent to controllable photoswitch；Data connect
Receiving end is by third polarization beam apparatus from photon beam S1 receivesThe middle a branch of photon of sorting, is set as S2 receive, photon beam S2 hairsWith photon beam S2 receivePlace
In Entangled State；
Controllable photoswitch reads the bit for needing to send from data source, and the quantum bit control switch sent as needed is cut
Change place makes S2 hairsHolding polarization state is constant or polarization state is rotated by 90 °；
Data receiver is by the 4th polarization beam apparatus by photon beam S2 receive, it is set asWith
Two photon beams in statistics and more same periodWithPhoton numbers, it is true according to the photon numbers detected
Determine the quantum bit of data sending terminal transmission, the specific method is as follows：
If detecting photon beamMiddle single photon quantity is more than photon beam1.5 times of middle single photon quantity, Huo Zheguang
BeamletMiddle single photon quantity is more than photon beam1.5 times of middle single photon quantity, then assert data sending terminal S2 hairsKeep inclined
Polarization state is constant or polarization state is rotated by 90 °, and to obtain the switching position of controllable photoswitch, further determines that data sending terminal is sent out
The bit sent；
If detecting photon beamMiddle single photon quantity is not more than photon beam1.5 times of middle single photon quantity, or
Photon beamMiddle single photon quantity is not more than photon beam1.5 times of middle single photon quantity, then ignore as error code.
The above is only a preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, without departing from the technical principles of the invention, several improvement and deformations can also be made, these improvement and deformations
Also it should be regarded as protection scope of the present invention.
Claims (8)
1. the quantum safety direct communication method based on entangled photon pairs, which is characterized in that include the following steps：
The mutually orthogonal entangled photon pairs of multiple polarization states are prepared, sort one of each entangled photons centering photon through
One wave multiplexer is sent to data sending terminal, another photon is sent to data receiver through the second wave multiplexer；
Data sending terminal sorts a branch of photon by the first polarization beam apparatus from the photon beam received, is set as S1 hair；
Data receiver sorts a branch of photon by the second polarization beam apparatus from the photon beam received, is set as S1 receives, photon beam
S1 hairWith photon beam S1 receivesIn Entangled State；
Data sending terminal is by S1 hairPolarization direction is rotated by 90 °, and is set as S2 hairs, and by S2 hairsIt is sent to controllable photoswitch, controllable photoswitch
The bit for needing to send is read from data source, the bit control switching position sent as needed makes S2 hairsKeep polarization state
Constant or polarization state is rotated by 90 °；
Data receiver is by third polarization beam apparatus from photon beam S1 receivesThe middle a branch of photon of sorting, is set as S2 receive, photon beam S2 hairsWith
Photon beam S2 receiveIn Entangled State；By the 4th polarization beam apparatus by photon beam S2 receive, it is set asWith
Two photon beams in statistics and more same periodWithPhoton numbers, determine number according to the photon numbers detected
The quantum bit sent according to transmitting terminal.
2. the quantum safety direct communication method according to claim 1 based on entangled photon pairs, which is characterized in that data
The time lag that receiving terminal receives the second wave multiplexer transmission photon receives the first wave multiplexer transmission photon in data sending terminal
Time.
3. the quantum safety direct communication method according to claim 1 based on entangled photon pairs, which is characterized in that according to
The photon numbers detected determine that the method for the quantum bit that data sending terminal is sent is as follows：
If detecting photon beamMiddle single photon quantity is more than photon beam1.5 times or photon beam of middle single photon quantityMiddle single photon quantity is more than photon beam1.5 times of middle single photon quantity, then assert data sending terminal S2 hairsKeep polarization state
Constant or polarization state is rotated by 90 °, and to obtain the switching position of controllable photoswitch, is further determined that transmitted by data sending terminal
Quantum bit；
If detecting photon beamMiddle single photon quantity is not more than photon beam1.5 times or photon of middle single photon quantity
BeamMiddle single photon quantity is not more than photon beam1.5 times of middle single photon quantity, then ignore as error code.
4. the Quantum Secure Direct Communication system based on entangled photon pairs, which is characterized in that including
It is multiple to tangle source：It is used to prepare the mutually orthogonal entangled photon pairs of multiple polarization states；
First wave multiplexer：Photon transmission for being sorted from multiple entangled photons centerings is to data sending terminal；
Second wave multiplexer：Photon transmission for being sorted from multiple entangled photons centerings is to data receiver；
Data sending terminal：Including the first polarization beam apparatus, the first faraday rotator mirror, controllable photoswitch, the second faraday
Rotating mirror and data source；
First polarization beam apparatus sorts a branch of first Faraday rotation that is transmitted to from the photon beam that the first wave multiplexer exports and reflects
Mirror, the first faraday rotator mirror are transmitted to controllable photoswitch, controllable light after being rotated by 90 ° the photon beam polarization state received
It switchs from the data source and reads the bit for needing to send, the bit control switching position sent as needed makes controllable
The photon beam that photoswitch receives keeps polarization state constant or is rotated by 90 ° by the second faraday rotator mirror polarization state；
Data receiver：Including sequentially connected second polarization beam apparatus, third polarization beam apparatus and the 4th polarization beam apparatus,
Two output ends of four polarization beam apparatus are connected separately with single photon detector；
Second polarization beam apparatus is sorted from the photon beam that the second wave multiplexer exports a branch of is transmitted to third polarization beam apparatus, third
Polarization beam apparatus sub-elected from the photon beam received it is a branch of be transmitted to the 4th polarization beam apparatus, the 4th polarization beam apparatus will connect
The photon beam received is divided into two beams and is transmitted separately to two single photon detectors, the number of photons detected according to two single photon detectors
Amount determines the bit that data sending terminal is sent；
Wherein：The photon beam that the photon beam that first faraday rotator mirror receives is received with third polarization beam apparatus is in
Entangled State；The photon beam that the photon beam and the 4th polarization beam apparatus that controllable photoswitch receives receive is in Entangled State.
5. the Quantum Secure Direct Communication system according to claim 4 based on entangled photon pairs, which is characterized in that first
Wave multiplexer is by the first single mode optical fiber channel by the photon transmission sorted from multiple entangled photons centerings to data sending terminal；
Second wave multiplexer is connect the photon transmission sorted from multiple entangled photons centerings to data by the second single mode optical fiber channel
Receiving end；
The length in the second single mode optical fiber channel is more than the length in the first single mode optical fiber channel.
6. the Quantum Secure Direct Communication system according to claim 4 based on entangled photon pairs, which is characterized in that first
Distinguish between polarization beam apparatus and the first faraday rotator mirror, between the first faraday rotator mirror and controllable photoswitch
It is connected by polarization maintaining optical fibre.
7. the Quantum Secure Direct Communication system according to claim 4 based on entangled photon pairs, which is characterized in that described
Data sending terminal further includes first laser terminator, second laser terminator, and the first polarization beam apparatus does not transmit what is sub-elected
Photon beam to the first faraday rotator mirror is transmitted to first laser terminator；
One output end of controllable photoswitch is connected to second laser terminator, and another output end is reflected through the second Faraday rotation
Mirror is connected to second laser terminator.
8. the Quantum Secure Direct Communication system according to claim 4 based on entangled photon pairs, which is characterized in that data
Receiving terminal further includes third laser terminator, the light for being not transferred to third polarization beam apparatus that the second polarization beam apparatus will sub-elect
Beamlet is transmitted to third laser terminator；The 4th polarization beam apparatus of being not transferred to that third polarization beam apparatus will sub-elect simultaneously
Photon beam is also transmitted to third laser terminator.
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| XIUJUAN ZHANG: "Three-party quantum secure direct communication base on Partially Entangled States", 《IEEE》 * |
| 李熙涵: "量子直接通信", 《物理学报》 * |
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| Publication number | Publication date |
|---|---|
| CN108650084B (en) | 2020-10-27 |
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