CN106656494B - Quantum key distribution system and method based on continuous photointerruption - Google Patents
Quantum key distribution system and method based on continuous photointerruption Download PDFInfo
- Publication number
- CN106656494B CN106656494B CN201710134189.7A CN201710134189A CN106656494B CN 106656494 B CN106656494 B CN 106656494B CN 201710134189 A CN201710134189 A CN 201710134189A CN 106656494 B CN106656494 B CN 106656494B
- Authority
- CN
- China
- Prior art keywords
- polarization
- beam splitter
- continuous
- light
- transmitting end
- 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.)
- Active
Links
Classifications
-
- 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
-
- 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
-
- 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
- H04B10/80—Optical aspects relating to the use of optical transmission for specific applications, not provided for in groups H04B10/03 - H04B10/70, e.g. optical power feeding or optical transmission through water
- H04B10/85—Protection from unauthorised access, e.g. eavesdrop protection
Abstract
A quantum key distribution system and method based on continuous photointerruption, wherein a transmitting end comprises a continuous optical signal laser, a synchronous laser, a continuous photointerruption intensity modulator, a decoy state intensity modulator, a phase modulator, a first adjustable attenuator, a second adjustable attenuator and a transmitting end wavelength division multiplexer, and a receiving end comprises a receiving end wavelength division multiplexer, a synchronous detector, a polarization beam splitter and a single photon detector. Compared with the prior art, the invention decomposes signal light into two vertical polarization states by adding the polarization beam splitter at the receiving end, utilizes the polarization-maintaining optical fiber interference ring to complete interference under respective polarization states, obtains better interference results, simplifies the system redundancy, simultaneously adopts a continuous photointerrupter mode at the transmitting end to obtain two light pulses with consistent polarization states, omits the manufacture of the transmitting end interference ring, further simplifies the system redundancy and reduces the production cost.
Description
Technical Field
The invention relates to the technical field of optical transmission safety communication, in particular to a quantum key distribution system and method based on continuous photointerruption.
Background
With the wide spread of the internet, the information transfer between people reaches an unprecedented number and frequency, and various private information is increasingly exposed on the internet, so that the demand of people for secret communication also reaches an unprecedented height. The existing encryption mode of internet information security is called a public key cryptosystem, and the principle is that a public key transmitted on a network and a private key remained in a computer are generated through an encryption algorithm, and the two keys must be matched to use to realize complete encryption and decryption processes.
The encryption standard used by the modern Internet is an RSA algorithm which is born in the 70 th century of 20, namely, the encryption standard is hard to calculate by utilizing the mass factor decomposition of a large number to ensure the security of a secret key.
The quantum key distribution is BB84 protocol based on quantum mechanics measurement principle proposed by the physicist Bennett and the cryptologist Brangard in 1984, and the security of the key can be fundamentally ensured by the quantum key distribution.
In the prior art, a quantum key generates signal light at a transmitting end, and in the traditional quantum channel transmission process, due to the effects of double refraction and the like of an optical fiber channel, the polarization state of the quantum key has larger change, the interference effect of the later period of an optical signal is affected, the integral key is lost, at present, a deviation correcting system is added at a receiving end to solve the problems, the polarization state of the optical signal is restored through the deviation correcting system, but the deviation correcting system needs complex hardware and software to be composed, the complexity of the integral system is brought to the whole key distribution system, and the production cost is increased.
Disclosure of Invention
The invention aims to provide a quantum key distribution system and a quantum key distribution method, which are used for solving the technical defects that in the prior art, a deviation rectifying system is added at a receiving end for solving the problem of polarization state change of signal light transmitted in a quantum channel, and the polarization state of an optical signal is restored through the deviation rectifying system, but the deviation rectifying system needs complex hardware and software parts to form, so that the complexity of the whole system and the technical defect of improving the production cost are brought to the whole key distribution system.
The technical scheme of the invention is realized as follows:
the quantum key distribution system based on continuous photointerruption comprises a transmitting end and a receiving end, wherein the transmitting end and the receiving end are connected through a quantum channel, the transmitting end comprises a transmitting end driving plate, a continuous optical signal laser, a synchronous laser, a continuous photointerruption intensity modulator, a decoy state intensity modulator, a phase modulator, a first adjustable attenuator, a second adjustable attenuator and a transmitting end wavelength division multiplexer, the continuous optical signal laser is sequentially connected with the continuous photointerruption intensity modulator, the decoy state intensity modulator, the phase modulator, the first adjustable attenuator and the transmitting end wavelength division multiplexer, the synchronous laser is sequentially connected with the second adjustable attenuator and the transmitting end wavelength division multiplexer, the first adjustable attenuator and the second adjustable attenuator are connected with the same end of the transmitting end wavelength division multiplexer, and the transmitting end driving plate is respectively connected with the continuous optical signal laser, the synchronous laser, the continuous photointerruption intensity modulator, the decoy state intensity modulator, the phase modulator, the first adjustable attenuator and the second adjustable attenuator;
the receiving end comprises a receiving end driving plate, a receiving end wavelength division multiplexer, a synchronous detector, a polarization beam splitter, a first polarization beam splitter, a second polarization beam splitter and a single photon detector, wherein the receiving end wavelength division multiplexer is connected with the transmitting end wavelength division multiplexer through a quantum channel, the other end of the receiving end wavelength division multiplexer is respectively connected with the synchronous detector and the polarization beam splitter, the polarization beam splitter is sequentially connected with the first polarization beam splitter and the second polarization beam splitter, the first polarization beam splitter is respectively connected with the second polarization beam splitter through a long-arm polarization-maintaining optical fiber and a short-arm polarization-maintaining optical fiber, a phase regulator is connected in the long-arm polarization-maintaining optical fiber, and the other end of the second polarization-maintaining optical fiber is connected with two paths of single photon detectors, and the receiving end driving plate is respectively connected with the synchronous detector, the phase regulator and the single photon detector.
Preferably, the quantum channel is a single mode fiber.
Preferably, the receiving end further comprises a third polarization maintaining beam splitter and a fourth polarization maintaining beam splitter, the polarization beam splitters are sequentially connected with the third polarization maintaining beam splitter and the fourth polarization maintaining beam splitter, the third polarization maintaining beam splitter is connected with the fourth polarization maintaining beam splitter through a long-arm polarization maintaining fiber and a short-arm polarization maintaining fiber respectively, a phase regulator is connected in the long-arm polarization maintaining fiber, and the other end of the fourth polarization maintaining beam splitter is connected with two paths of single photon detectors.
Preferably, the transmitting end further comprises a depolarizer, and the depolarizer is arranged between the phase modulator of the transmitting end part and the first adjustable attenuator.
The invention also provides a quantum key distribution method based on continuous photointerruption according to claim 1, which comprises the following steps:
1) Triggering a laser: the transmitting end respectively triggers the continuous optical signal laser and the synchronous laser to transmit continuous signal light and synchronous light by using the same clock signal, wherein the continuous signal light is used as modulated light, and the synchronous light is transmitted to the receiving end as a synchronous signal and is responded by the synchronous detector to be used by the receiving end;
2) Continuous signal light attenuation chopping: chopping the continuous signal light into pulse light by using a continuous light chopping intensity modulator, wherein the repetition frequency of the pulse light is twice that of the continuous signal light;
3) Decoy state modulation: the pulse light is subjected to random intensity modulation through a decoy state intensity modulator to become signal light in a signal state, a decoy state or a vacuum state;
4) The electric control adjustable attenuator attenuates the signal light: the signal light attenuates the light pulse to the single photon magnitude through the first adjustable attenuator, and the synchronous light adjusts the synchronous light to the intensity range which can be responded by the receiving end through the second adjustable attenuator;
5) The signal light and the synchronous light are transmitted through a quantum channel: the signal light and the synchronous light with different wavelengths are combined into a channel for transmission at a transmitting end through a transmitting end wavelength division multiplexer, and are re-decomposed at a receiving end through a receiving end wavelength division multiplexer;
6) Splitting by a polarizing beam splitter: decomposing light with unsynchronized polarization into a horizontal polarization direction and a vertical polarization direction through a polarization beam splitter;
7) Interference at the receiving end: the method comprises the steps that a first polarization-preserving beam splitter is used for manufacturing an unequal arm MZ interference ring with the same length difference as that of a transmitting end arm, signal light is divided into two pulses through the polarization-preserving beam splitter, one of the two pulses passes through a long arm, a phase modulator is added in the long arm, random phase modulation is carried out on the signal light, and a short arm does not carry out modulation;
8) Single photon detector detects: the single photon detector detects the optical signal for subsequent processing to generate the security key.
Preferably, in the step 3), the signal light is subjected to random 4-phase modulation, which is 0, pi/2, pi, 3 pi/2 respectively; in step 7), the signal light is subjected to random 2-phase modulation, which is 0 and pi/2 respectively.
Preferably, the step 7) further includes another interference, a third polarization-maintaining beam splitter is used to manufacture an unequal arm MZ interference loop with the same length difference as the transmitting end arm, the signal light is divided into two pulses by the polarization-maintaining beam splitter, one path passes through the long arm, a phase modulator is added in the long arm, the random phase modulation is performed on the signal light, and the short arm does not perform modulation.
Compared with the prior art, the invention has the following beneficial effects:
according to the quantum key distribution system, the polarization beam splitter is added at the receiving end to decompose the signal light into two perpendicular polarization states, interference under the respective polarization states is completed by the polarization-maintaining optical fiber interference ring, a good interference result is obtained, the influence of the birefringence effect on the interference result caused by the light polarization state in the optical fiber transmission process is avoided, meanwhile, a deviation correcting system is abandoned, the system redundancy is simplified, and the production cost is reduced; meanwhile, two light pulses with consistent polarization states are obtained in a continuous photointerruption mode at the transmitting end, so that the manufacturing of an interference ring at the transmitting end is omitted, the redundancy of a system is further simplified, and the production cost is reduced.
Drawings
FIG. 1 is a schematic block diagram of a quantum key distribution system of the present invention;
fig. 2 is a flow chart of a quantum key distribution method of the present invention.
In the figure: transmitting end 1, transmitting end driving board 101, continuous optical signal laser 102, synchronous laser 103, continuous photointerruption intensity modulator 104, decoy intensity modulator 105, first tunable attenuator 106, second tunable attenuator 107, transmitting end wavelength division multiplexer 108, depolarizer 109, receiving end 2, receiving end driving board 201, receiving end wavelength division multiplexer 202, synchronous detector 203, polarizing beam splitter 204, first polarization maintaining beam splitter 205, second polarization maintaining beam splitter 206 and single photon detector 207, third polarization maintaining beam splitter 208, fourth polarization maintaining beam splitter 209, quantum channel 3, phase adjuster 4.
Detailed Description
The present invention will now be described more fully hereinafter with reference to the accompanying drawings, in which embodiments of the invention are shown.
As shown in fig. 1 to fig. 2, a continuous photointerruption-based quantum key distribution system includes a transmitting end 1 and a receiving end 2, where the transmitting end 1 and the receiving end 2 are connected through a quantum channel 3, the transmitting end 1 includes a transmitting end driving board 101, a continuous optical signal laser 102, a synchronous laser 103, a continuous photointerruption intensity modulator 104, a decoy-state intensity modulator 105, a phase modulator 4, a first adjustable attenuator 106, a second adjustable attenuator 107, and a transmitting end wavelength division multiplexer 108, the continuous optical signal laser 102 is sequentially connected with the continuous photointerruption intensity modulator 104, the decoy-state intensity modulator 105, the phase modulator 4, a first adjustable attenuator 106, and the transmitting end wavelength division multiplexer 108, the synchronous laser 103 is sequentially connected with the second adjustable attenuator 107, and the transmitting end wavelength division multiplexer 108, the first adjustable attenuator 106 is connected with the same end of the second adjustable attenuator 107, and the transmitting end driving board 101 is respectively connected with the continuous optical signal laser 103, the continuous optical signal modulator 102, the decoy-state intensity modulator 105, the phase modulator 106, the first adjustable attenuator 102, and the second adjustable attenuator 106, and the transmitting end wavelength division multiplexer 108; the phase regulator 4 of the transmitting end 1 part, the continuous photointerruption intensity modulator 104, the decoy state intensity modulator 105, the first adjustable attenuator 107 and the second adjustable attenuator 108 are respectively connected with the transmitting end driving board 101 through analog control signal lines, and the continuous optical signal laser 102 and the synchronous laser 103 are respectively connected with the transmitting end driving board 101 through digital control signal lines; the receiving end 2 comprises a receiving end driving board 201, a receiving end wavelength division multiplexer 202, a synchronous detector 203, a polarization beam splitter 204, a first polarization maintaining beam splitter 205, a second polarization maintaining beam splitter 206 and a single photon detector 207, the receiving end wavelength division multiplexer 202 is connected with the transmitting end wavelength division multiplexer 108 through a quantum channel 3, the other end of the receiving end wavelength division multiplexer 202 is respectively connected with the synchronous detector 203 and the polarization beam splitter 204, the polarization beam splitter 204 is sequentially connected with the first polarization maintaining beam splitter 205 and the second polarization maintaining beam splitter 206, the first polarization maintaining beam splitter 205 is respectively connected with the second polarization maintaining beam splitter 206 through a long-arm polarization maintaining fiber and a short-arm polarization maintaining fiber, a phase regulator 4 is connected in the long-arm polarization maintaining fiber, the other end of the second polarization maintaining beam splitter 206 is connected with the two single photon detectors 207, the receiving end driving board 201 is respectively connected with the synchronous detector 203, the phase regulator 4 and the single photon detector 207, and the phase regulator 4 of the receiving end 2 is connected with the receiving end driving board 201 through an analog control signal wire. In this embodiment, the quantum channel 3 is a single mode fiber, and if the distance between the quantum channels 3 is not too long, polarization maintaining fiber transmission can be adopted to increase the stability of the polarization state of the signal light. The receiving end 2 further comprises a third polarization maintaining beam splitter 208 and a fourth polarization maintaining beam splitter 209, the polarization beam splitter 204 is sequentially connected with the third polarization maintaining beam splitter 208 and the fourth polarization maintaining beam splitter 209, the third polarization maintaining beam splitter 208 is connected with the fourth polarization maintaining beam splitter 209 through a long-arm polarization maintaining fiber and a short-arm polarization maintaining fiber respectively, the long-arm polarization maintaining fiber is connected with the phase regulator 4, the other end of the fourth polarization maintaining beam splitter 209 is connected with the two single photon detectors 207, the quantum key distribution system adopts four single photon detectors 207 to detect photons altogether, wherein the first polarization maintaining beam splitter 205 and the second polarization maintaining beam splitter 206 form an interference ring with the phase regulator 4 through the long-arm polarization maintaining fiber and the short-arm polarization maintaining fiber, and the third polarization maintaining beam splitter 208 and the fourth polarization maintaining beam splitter 209 form another interference ring with the phase regulator 4 through the long-arm polarization maintaining fiber and the short-arm polarization maintaining fiber. The transmitting end 1 further comprises a depolarizer 109, the depolarizer 109 is arranged between the phase modulator 4 and the first adjustable attenuator 106 at the transmitting end part, and the depolarizer 109 can reduce the polarization degree of the signal light to 0, so that the polarization state of the signal light is in a natural light state, and the security of a system transmission key is effectively ensured.
The invention also provides a quantum key distribution method based on continuous photointerruption according to claim 1, which comprises the following steps:
1) Triggering a laser: the transmitting end respectively triggers the continuous optical signal laser and the synchronous laser to transmit continuous signal light and synchronous light by using the same clock signal, wherein the continuous signal light is used as modulated light, and the synchronous light is transmitted to the receiving end as a synchronous signal and is responded by the synchronous detector to be used by the receiving end;
2) Continuous signal light attenuation chopping: chopping the continuous signal light into pulse light by using a continuous light chopping intensity modulator, wherein the repetition frequency of the pulse light is twice that of the continuous signal light;
3) Decoy state modulation: the pulse light is subjected to random intensity modulation through a decoy state intensity modulator to become signal light in a signal state, a decoy state or a vacuum state;
4) The electric control adjustable attenuator attenuates the signal light: the signal light attenuates the light pulse to the single photon magnitude through the first adjustable attenuator, and the synchronous light adjusts the synchronous light to the intensity range which can be responded by the receiving end through the second adjustable attenuator;
5) The signal light and the synchronous light are transmitted through a quantum channel: the signal light and the synchronous light with different wavelengths are combined into a channel for transmission at a transmitting end through a transmitting end wavelength division multiplexer, and are re-decomposed at a receiving end through a receiving end wavelength division multiplexer;
6) Splitting by a polarizing beam splitter: decomposing light with unsynchronized polarization into a horizontal polarization direction and a vertical polarization direction through a polarization beam splitter;
7) Interference at the receiving end: the method comprises the steps that a first polarization-preserving beam splitter is used for manufacturing an unequal arm MZ interference ring with the same length difference as that of a transmitting end arm, signal light is divided into two pulses through the polarization-preserving beam splitter, one of the two pulses passes through a long arm, a phase modulator is added in the long arm, random phase modulation is carried out on the signal light, and a short arm does not carry out modulation;
8) Single photon detector detects: the single photon detector detects the optical signal for subsequent processing to generate the security key. In the step 3), the signal light is subjected to random 4-phase modulation, which is respectively 0, pi/2, pi and 3 pi/2; in step 7), the signal light is subjected to random 2-phase modulation, which is 0 and pi/2 respectively. The step 7) further comprises the step of interfering the other path, manufacturing an unequal arm MZ interference ring with the same length difference as the transmitting end arm by using a third polarization maintaining beam splitter, dividing the signal light into two pulses by the polarization maintaining beam splitter, wherein one path passes through a long arm, a phase modulator is added in the long arm, and carrying out random phase modulation on the signal light, and the short arm does not carry out modulation.
As known from the quantum key distribution system and the quantum key distribution method provided by the invention, the signal light is decomposed into two perpendicular polarization states by adding the polarization beam splitter at the receiving end, interference under the respective polarization states is completed by utilizing the polarization-maintaining optical fiber interference ring, a better interference result is obtained, the influence of the birefringence effect on the interference result caused by the light polarization state in the optical fiber transmission process is avoided, meanwhile, a deviation correcting system is abandoned, the redundancy of the system is simplified, and the production cost is also reduced; meanwhile, two light pulses with consistent polarization states are obtained in a continuous photointerruption mode at the transmitting end, so that the manufacturing of an interference ring at the transmitting end is omitted, the redundancy of a system is further simplified, and the production cost is reduced.
Claims (7)
1. A quantum key distribution system based on continuous photointerruption, characterized in that: the device comprises a transmitting end and a receiving end, wherein the transmitting end is connected with the receiving end through a quantum channel, the transmitting end comprises a transmitting end driving plate, a continuous optical signal laser, a synchronous laser, a continuous photointerruption intensity modulator, a decoy state intensity modulator, a phase modulator, a first adjustable attenuator, a second adjustable attenuator and a transmitting end wavelength division multiplexer, the continuous optical signal laser is sequentially connected with the continuous photointerruption intensity modulator, the decoy state intensity modulator, the phase modulator, the first adjustable attenuator and the transmitting end wavelength division multiplexer, the synchronous laser is sequentially connected with the second adjustable attenuator and the transmitting end wavelength division multiplexer, the first adjustable attenuator and the second adjustable attenuator are connected with the same end of the transmitting end wavelength division multiplexer, and the transmitting end driving plate is respectively connected with the continuous optical signal laser, the synchronous laser, the continuous photointerruption intensity modulator, the decoy state intensity modulator, the phase modulator, the first adjustable attenuator and the second adjustable attenuator;
the receiving end comprises a receiving end driving plate, a receiving end wavelength division multiplexer, a synchronous detector, a polarization beam splitter, a first polarization beam splitter, a second polarization beam splitter and a single photon detector, wherein the receiving end wavelength division multiplexer is connected with the transmitting end wavelength division multiplexer through a quantum channel, the other end of the receiving end wavelength division multiplexer is respectively connected with the synchronous detector and the polarization beam splitter, the polarization beam splitter is sequentially connected with the first polarization beam splitter and the second polarization beam splitter, the first polarization beam splitter is respectively connected with the second polarization beam splitter through a long-arm polarization-maintaining optical fiber and a short-arm polarization-maintaining optical fiber, a phase regulator is connected in the long-arm polarization-maintaining optical fiber, and the other end of the second polarization-maintaining optical fiber is connected with two paths of single photon detectors, and the receiving end driving plate is respectively connected with the synchronous detector, the phase regulator and the single photon detector.
2. The continuous photointerruption-based quantum key distribution system of claim 1, wherein the quantum channel is a single mode fiber.
3. The quantum key distribution system based on continuous photointerruption according to claim 2, wherein the receiving end further comprises a third polarization maintaining beam splitter and a fourth polarization maintaining beam splitter, the polarization beam splitters are sequentially connected with the third polarization maintaining beam splitter and the fourth polarization maintaining beam splitter, the third polarization maintaining beam splitter is connected with the fourth polarization maintaining beam splitter through a long-arm polarization maintaining fiber and a short-arm polarization maintaining fiber respectively, a phase regulator is connected in the long-arm polarization maintaining fiber, and the other end of the fourth polarization maintaining beam splitter is connected with two single photon detectors.
4. The continuous photointerruption based quantum key distribution system of claim 1, wherein said transmitting end further comprises a depolarizer disposed between the phase modulator of the transmitting end portion and the first tunable attenuator.
5. A continuous photointerruption-based quantum key distribution method according to claim 1, comprising the steps of:
1) Triggering a laser: the transmitting end respectively triggers the continuous optical signal laser and the synchronous laser to transmit continuous signal light and synchronous light by using the same clock signal, wherein the continuous signal light is used as modulated light, and the synchronous light is transmitted to the receiving end as a synchronous signal and is responded by the synchronous detector to be used by the receiving end;
2) Continuous signal light attenuation chopping: chopping the continuous signal light into pulse light by using a continuous light chopping intensity modulator, wherein the repetition frequency of the pulse light is twice that of the continuous signal light;
3) Decoy state modulation: the pulse light is subjected to random intensity modulation through a decoy state intensity modulator to become signal light in a signal state, a decoy state or a vacuum state;
4) The electric control adjustable attenuator attenuates the signal light: the signal light attenuates the light pulse to the single photon magnitude through the first adjustable attenuator, and the synchronous light adjusts the synchronous light to the intensity range which can be responded by the receiving end through the second adjustable attenuator;
5) The signal light and the synchronous light are transmitted through a quantum channel: the signal light and the synchronous light with different wavelengths are combined into a channel for transmission at a transmitting end through a transmitting end wavelength division multiplexer, and are re-decomposed at a receiving end through a receiving end wavelength division multiplexer;
6) Splitting by a polarizing beam splitter: decomposing light with unsynchronized polarization into a horizontal polarization direction and a vertical polarization direction through a polarization beam splitter;
7) Interference at the receiving end: the method comprises the steps that a first polarization-preserving beam splitter is used for manufacturing an unequal arm MZ interference ring with the same length difference as that of a transmitting end arm, signal light is divided into two pulses through the polarization-preserving beam splitter, one of the two pulses passes through a long arm, a phase modulator is added in the long arm, random phase modulation is carried out on the signal light, and a short arm does not carry out modulation;
8) Single photon detector detects: the single photon detector detects the optical signal for subsequent processing to generate the security key.
6. The method for quantum key distribution based on continuous photointerruption according to claim 5, wherein in said step 3), the signal light is subjected to random 4-phase modulation of 0, pi/2, pi, 3 pi/2, respectively; in step 7), the signal light is subjected to random 2-phase modulation, which is 0 and pi/2 respectively.
7. The method for quantum key distribution based on continuous photointerruption according to claim 5, wherein the step 7) further comprises another path of interference, wherein a third polarization-maintaining beam splitter is used for manufacturing an unequal arm MZ interference loop with the same length difference as the transmitting end arm, the signal light is divided into two pulses by the polarization-maintaining beam splitter, one path of signal light passes through a long arm, a phase modulator is added in the long arm, the signal light is subjected to random phase modulation, and the short arm is not subjected to modulation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710134189.7A CN106656494B (en) | 2017-03-08 | 2017-03-08 | Quantum key distribution system and method based on continuous photointerruption |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710134189.7A CN106656494B (en) | 2017-03-08 | 2017-03-08 | Quantum key distribution system and method based on continuous photointerruption |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106656494A CN106656494A (en) | 2017-05-10 |
| CN106656494B true CN106656494B (en) | 2023-08-18 |
Family
ID=58847171
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710134189.7A Active CN106656494B (en) | 2017-03-08 | 2017-03-08 | Quantum key distribution system and method based on continuous photointerruption |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106656494B (en) |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018161733A1 (en) * | 2017-03-08 | 2018-09-13 | 浙江九州量子信息技术股份有限公司 | Quantum key distribution system and method |
| CN106850217B (en) * | 2017-04-06 | 2019-06-14 | 山西大学 | A kind of realization one-dimensional modulation continuous variable quantum key delivering method |
| CN109962770B (en) * | 2017-12-14 | 2024-03-12 | 科大国盾量子技术股份有限公司 | Silicon-based monolithic integrated quantum key distribution sender chip |
| CN108183793B (en) * | 2017-12-25 | 2023-04-07 | 广东国腾量子科技有限公司 | Multi-user measuring equipment independent quantum key distribution system and method |
| CN110351070A (en) * | 2018-04-02 | 2019-10-18 | 浙江九州量子信息技术股份有限公司 | A kind of quantum key distribution system and method based on Y waveguide |
| CN110351068B (en) * | 2018-04-02 | 2024-02-09 | 浙江九州量子信息技术股份有限公司 | Quantum key distribution system and method based on waveguide |
| CN109462478A (en) * | 2018-12-29 | 2019-03-12 | 中国科学技术大学 | Quantum key distribution light source based on spontaneous radiation light source |
| CN113037468B (en) * | 2019-12-24 | 2023-04-28 | 山东国迅量子芯科技有限公司 | Monolithic silicon-based integrated chip and quantum key distribution system |
| CN114629563B (en) * | 2022-05-17 | 2022-08-16 | 浙江九州量子信息技术股份有限公司 | Polarization multiplexing quantum key distribution device and full-time full-pass quantum key distribution network |
Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101895495A (en) * | 2010-07-15 | 2010-11-24 | 北京邮电大学 | Method and system for transmitting and receiving by orthogonally dual-polarized differential quaternary phase shift keying |
| CN201965800U (en) * | 2011-03-11 | 2011-09-07 | 安徽量子通信技术有限公司 | Experimental optical path of quantum cryptography teaching system based on BB84 protocol |
| CN103414553A (en) * | 2013-07-29 | 2013-11-27 | 南京发艾博光电科技有限公司 | Quantum key distribution system and method based on time-slot mixed active polarization compensation |
| CN105162587A (en) * | 2015-09-25 | 2015-12-16 | 华南师范大学 | Multi-user orbital angular momentum multiplexing network system and quantum key distribution method thereof |
| CN105337730A (en) * | 2015-11-19 | 2016-02-17 | 山西大学 | Single-photon polarization control method based on phase encoding quantum key distribution (QKD) system and single-photon polarization control device based on phase encoding quantum key distribution (QKD) system |
| CN105897413A (en) * | 2016-05-26 | 2016-08-24 | 安徽问天量子科技股份有限公司 | Phase modulation polarization coded QKD system based on sagnac ring |
| 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 |
| CN106161010A (en) * | 2016-08-19 | 2016-11-23 | 浙江神州量子网络科技有限公司 | The high one-tenth point-to-point QKD system of code check and transmitting terminal, receiving terminal and QKD method |
| 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 |
| CN106209361A (en) * | 2016-07-22 | 2016-12-07 | 中国科学技术大学 | A kind of still can ensure safe star-like quantum key distribution network without credible relaying |
| CN206602534U (en) * | 2017-03-08 | 2017-10-31 | 浙江九州量子信息技术股份有限公司 | A kind of quantum key dispatching system based on continuous light copped wave |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100759811B1 (en) * | 2005-12-08 | 2007-09-20 | 한국전자통신연구원 | Transciver and method for high-speed auto-compensating quantum cryptography |
| JP5434373B2 (en) * | 2009-08-26 | 2014-03-05 | 沖電気工業株式会社 | Quantum entangled photon pair generator |
-
2017
- 2017-03-08 CN CN201710134189.7A patent/CN106656494B/en active Active
Patent Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101895495A (en) * | 2010-07-15 | 2010-11-24 | 北京邮电大学 | Method and system for transmitting and receiving by orthogonally dual-polarized differential quaternary phase shift keying |
| CN201965800U (en) * | 2011-03-11 | 2011-09-07 | 安徽量子通信技术有限公司 | Experimental optical path of quantum cryptography teaching system based on BB84 protocol |
| CN103414553A (en) * | 2013-07-29 | 2013-11-27 | 南京发艾博光电科技有限公司 | Quantum key distribution system and method based on time-slot mixed active polarization compensation |
| CN105162587A (en) * | 2015-09-25 | 2015-12-16 | 华南师范大学 | Multi-user orbital angular momentum multiplexing network system and quantum key distribution method thereof |
| CN105337730A (en) * | 2015-11-19 | 2016-02-17 | 山西大学 | Single-photon polarization control method based on phase encoding quantum key distribution (QKD) system and single-photon polarization control device based on phase encoding quantum key distribution (QKD) system |
| CN105897413A (en) * | 2016-05-26 | 2016-08-24 | 安徽问天量子科技股份有限公司 | Phase modulation polarization coded QKD system based on sagnac ring |
| CN106209361A (en) * | 2016-07-22 | 2016-12-07 | 中国科学技术大学 | A kind of still can ensure safe star-like quantum key distribution network without credible relaying |
| 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 |
| CN106161010A (en) * | 2016-08-19 | 2016-11-23 | 浙江神州量子网络科技有限公司 | The high one-tenth point-to-point QKD system of code check and transmitting terminal, receiving terminal and QKD method |
| 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 |
| CN206602534U (en) * | 2017-03-08 | 2017-10-31 | 浙江九州量子信息技术股份有限公司 | A kind of quantum key dispatching system based on continuous light copped wave |
Non-Patent Citations (1)
| Title |
|---|
| 刘友明 ; 汪超 ; 黄端 ; 黄鹏 ; 冯晓毅 ; 彭进业 ; 曹正文 ; 曾贵华 ; .高速连续变量量子密钥分发系统同步技术研究.光学学报.2015,(01),全文. * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106656494A (en) | 2017-05-10 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106656494B (en) | Quantum key distribution system and method based on continuous photointerruption | |
| CN106850213B (en) | Quantum key distribution system and method | |
| CN106789048B (en) | Quantum key distribution system and method based on two-way single photon detection | |
| CN106856429B (en) | Quantum key distribution system and method based on receiving end polarization beam splitting | |
| CN109586907B (en) | Fusion network system and method for quantum communication and quantum time-frequency transmission | |
| Da Silva et al. | Proof-of-principle demonstration of measurement-device-independent quantum key distribution using polarization qubits | |
| CN106161009B (en) | Quantum key distribution system based on time-phase encoding | |
| WO2018130052A1 (en) | Phase polarization multi-degree-of-freedom modulation qkd network system and method | |
| US8374350B2 (en) | Quantum communication system | |
| WO2006074151A2 (en) | Secure use of a single single-photon detector in a qkd system | |
| WO2017084380A1 (en) | Quantum communication method and apparatus | |
| CN108965344B (en) | System and method for safe backup of remote data | |
| CN107135071B (en) | Quantum key distribution system and method based on time division multiplexing | |
| CN110620663A (en) | Quantum key distribution system for polarization and phase composite coding | |
| CN209930270U (en) | Quantum communication system based on single photon communication technology | |
| CN110620619B (en) | Quantum communication system, transmitting end thereof and quantum communication method | |
| CN206743264U (en) | A kind of quantum key dispatching system based on two-way single photon detection | |
| WO2018161733A1 (en) | Quantum key distribution system and method | |
| CN111756526B (en) | Quantum key distribution system, transmitting end, receiving end and communication method thereof | |
| Pelet et al. | Operational entanglement-based quantum key distribution over 50 km of field-deployed optical fibers | |
| CN206517428U (en) | A kind of quantum key dispatching system | |
| CN206602533U (en) | A kind of quantum key dispatching system based on receiving terminal polarization beam splitting | |
| CN210629516U (en) | Quantum key distribution system for polarization and phase composite coding | |
| CN110351068B (en) | Quantum key distribution system and method based on waveguide | |
| Wang et al. | Loss-tolerant measurement device independent quantum key distribution with reference frame misalignment |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| CB02 | Change of applicant information |
Address after: 314500 -1, Beitang Road, Xiaoshan economic and Technological Development Zone, Hangzhou, Zhejiang 436, China Applicant after: ZHEJIANG QUANTUM TECHNOLOGIES Co.,Ltd. Address before: 314500, Zhejiang, Jiaxing, Tongxiang City, 320 Indus street, Nankang Road, 7 West, 4 floor Applicant before: ZHEJIANG QUANTUM TECHNOLOGIES Co.,Ltd. |
|
| CB02 | Change of applicant information | ||
| CB03 | Change of inventor or designer information |
Inventor after: Song Xiaotian Inventor after: Ye Zhining Inventor before: Song Xiaotian Inventor before: Zhao Yibo Inventor before: Ye Zhining |
|
| CB03 | Change of inventor or designer information | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |