CN203813797U - An all-fiber communication system of a quantum key distribution system - Google Patents
An all-fiber communication system of a quantum key distribution system Download PDFInfo
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- CN203813797U CN203813797U CN201420073229.3U CN201420073229U CN203813797U CN 203813797 U CN203813797 U CN 203813797U CN 201420073229 U CN201420073229 U CN 201420073229U CN 203813797 U CN203813797 U CN 203813797U
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- 238000004891 communication Methods 0.000 title abstract description 13
- 239000000835 fiber Substances 0.000 title abstract 5
- 230000003287 optical effect Effects 0.000 claims description 61
- 239000013307 optical fiber Substances 0.000 claims description 17
- 230000005540 biological transmission Effects 0.000 claims description 14
- 238000001514 detection method Methods 0.000 claims description 4
- 230000001360 synchronised effect Effects 0.000 abstract description 8
- 238000000034 method Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 241000700605 Viruses Species 0.000 description 1
- 230000001427 coherent effect Effects 0.000 description 1
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- 238000004321 preservation Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000009897 systematic effect Effects 0.000 description 1
Abstract
The utility model discloses an all-fiber communication system of a quantum key distribution system. The all-fiber communication system of the quantum key distribution system comprises a transmitting terminal and a receiving terminal. The transmitting terminal comprises a transmitting terminal FPGA, a quantum light laser 1, a synchronous light and classic signal multiplexing laser 2, a transmitting terminal operating system, a transmitting terminal quantum signal modulation system and a transmitting terminal wavelength division multiplexer DWDM. The receiving terminal comprises a receiving terminal FPGA, a single-photon detector SPD, a synchronous light detector, a receiving terminal quantum signal demodulation system, a receiving terminal wavelength division multiplexer DWDM and a receiving terminal operating system. According to the all-fiber communication system of the quantum key distribution system, three kinds of signals are put into one fiber to be transmitted through the adoption of a time division multiplexing mode, net wire connection is eliminated; secret key negotiation signals and synchronous data are transmitted through synchronous light laser time division multiplexing; QSK is enabled to be free from dependence on classic Ethernet communication; and the safety of a QKD system is greatly improved.
Description
Technical field
The present invention relates to a kind of communication system of quantum key dispatching system QKD equipment room, relate in particular to a kind of full optical fiber telecommunications system of quantum key dispatching system.
Background technology
Along with the business-like progress of QKD, the safety and stability of QKD system more and more receives the concern of industry.We know that the fail safe of quantum key is based on physical three large philosophys: measure the theory of collapsing, Heisenberg uncertainty principle, quantum and can not clone law.Therefore quantum key is considered to be perfectly safe, and the core value of quantum key is also just its being perfectly safe property.
Yet but there is very large potential safety hazard in actual QKD equipment.The processing of the core data in current QKD equipment and preservation are all to carry out in inner operating system platform, and the key agreement signal of transmitting terminal and receiving terminal transmission is also to be undertaken by the network interface on this platform.QKD equipment room always has two kinds of communication modes: a kind of is to come transmitting synchronous light signal and quantum key signal simultaneously with simple optical fiber, and another kind is by network cable transmission key agreement signal.In netting twine communication, both sides need alternately base information, error correction information, quantum secure to amplify relevant information and mutual synchronizing information etc., and both sides hold consultation according to these information, thereby obtain common key.Be easy to see that the operating system platform in QKD is actually the commander in chief of QKD equipment, yet we know that this equipment based on the general-purpose operating system is easy to be subject to virus attack, once that is to say that this system is connected into the Internet by netting twine, the fail safe of QKD is also just all gone so.Once the success of attack operation system, also just means that assailant just can at random control QKD equipment, certainly, the quantum key information of preserving in system also will be completely exposed.This security hole will be fatal, and it will cause the commercialization road of QKD equipment to sprawl.As shown in Figure 1, the signal of existing QKD communication between devices comprises three kinds: 1, transmitting terminal synchronous laser is sent synchronizable optical signal to receiving terminal synchronizable optical detector, and both sides are usingd this as synchronizing signal.2, transmitting terminal quantum light laser sends quantum signal to receiving terminal single-photon detector, and both sides all modulate quantum light in quantum signal optical channel, is exactly required quantum key initial data after this modulation signal demodulation.3, transmitting terminal and receiving terminal are realized network by the network interface in domestic os separately and are connected, and both sides' handshake, correcting data error matched signal, the quantum key key agreement signals such as amplifying coherent signal of maintaining secrecy is all to pass through network cable transmission.If Fig. 1 is traditional QKD data communication package.
Summary of the invention
Technical scheme to be solved by this invention is for above-mentioned the deficiencies in the prior art, and a kind of full optical fiber telecommunications system of quantum key dispatching system is provided.The full optical fiber telecommunications system of this quantum key dispatching system can adopt simple optical fiber by the mode of time-sharing multiplex, to realize the transmission of quantum key signal, synchronizable optical signal and key agreement signal, to reach the object of eliminating the QKD security hole that classic network communication brings.
For solving the problems of the technologies described above, the technical scheme that the present invention takes is: a kind of full optical fiber telecommunications system of quantum key dispatching system, comprise transmitting terminal and receiving terminal, and it is characterized in that:
Described transmitting terminal comprises transmitting terminal FPGA, quantum light laser Laser1, synchronizable optical and the multiplexing laser Laser2 of classical signals, transmitting terminal operating system, transmitting terminal quantum signal modulating system, transmitting terminal wavelength division multiplexer DWDM;
Described receiving terminal comprises receiving terminal FPGA, single-photon detector SPD, synchronizable optical detector, receiving terminal quantum signal demodulating system, receiving terminal wavelength division multiplexer DWDM, receiving terminal operating system;
The light frequency of the multiplexing laser Laser2 transmission of quantum light laser Laser1 and synchronizable optical and classical signals is not identical;
Described quantum light laser Laser1, synchronizable optical and the multiplexing laser Laser2 of classical signals and transmitting terminal operating system are electrically connected to transmitting terminal FPGA respectively; Single-photon detector SPD, synchronizable optical detector and receiving terminal operating system are electrically connected to receiving terminal FPGA respectively;
Quantum light laser Laser1 is used for sending quantum key signal to transmitting terminal quantum signal modulating system; Transmitting terminal quantum signal modulating system will send to transmitting terminal wavelength division multiplexer DWDM after quantum signal coding; The multiplexing laser Laser2 of described synchronizable optical and classical signals sends synchronizable optical signal and key agreement signal to transmitting terminal wavelength division multiplexer DWDM in the mode of time-sharing multiplex; In the synchronizable optical signal that the quantum light that described transmitting terminal wavelength division multiplexer DWDM sends transmitting terminal quantum signal modulating system and synchronizable optical and the multiplexing laser Laser2 of classical signals send and key agreement signal loading to optical fiber and send to receiving terminal wavelength division multiplexer DWDM;
Receiving terminal wavelength division multiplexer DWDM is divided into two-way light by the light of two kinds of wavelength that receive, Bing Jiang mono-road light sends to receiving terminal quantum signal demodulating system, after demodulation, send into again single-photon detector, single-photon detector sends to receiving terminal FPGA by detection data after quantum light is surveyed, and forms original vol sub-key; Receiving terminal wavelength division multiplexer DWDM sends another road light into synchronizable optical detector simultaneously, and synchronizable optical detector output synchronizing signal and key agreement signal are to receiving terminal FPGA; Receiving terminal FPGA receives after synchronizing signal, quantum key signal is done synchronously.
As further improved technical scheme of the present invention, synchronizable optical detector comes selectivity output synchronizing signal and key agreement signal to receiving terminal FPGA by control circuit.
As further improved technical scheme of the present invention, the transmission frequency of quantum light laser Laser1 is 200MHZ, and the quantum optical wavelength of transmitting is 1550.92nm; The light frequency of the multiplexing laser Laser2 transmitting of synchronizable optical and classical signals is 1MHZ; Receiving terminal FPGA receives after synchronizing signal, and synchronizing signal frequency multiplication is also done synchronously quantum key signal by the synchronizing signal of this 200MHZ to 200MHZ.
The frequency of QKD transmission of quantum key signal take below as 200M is example, the course of work of the present invention and principle be described:
1, transmitting terminal sends quantum key signal by the quantum light laser Laser1 of 1550.12nm, and its transmission frequency is 200M; With a 1550.92nm, with synchronizable optical and the multiplexing laser Laser2 of classical signals, in the mode of time-sharing multiplex, send synchronizable optical signal and key agreement signal more in addition; Then the light of two kinds of lasers is loaded into and in an optical fiber, is sent to receiving terminal wavelength division multiplexer DWDM by wavelength division multiplexer.The particularly important is, the synchronizable optical signal that the multiplexing laser Laser2 of synchronizable optical and classical signals sends not is the quantum light signal same frequency that sends with quantum light laser Laser1, if still adopt the repetition rate identical with quantum light, so just cannot realize and send again key agreement signal in synchronizable optical pulse interval.The present invention is arranged on 1MHZ by the trigger rate of synchronizable optical, that is to say between each synchronizable optical pulse between be separated with 1us, in this 1us interval, have the sufficient time to go to transmit the key agreement information that both sides need completely.
2, receiving terminal is divided into two-way by receiving terminal wavelength division multiplexer DWDM by the light of two kinds of wavelength, receiving terminal quantum signal demodulating system is sent on one tunnel, after demodulation, send into single-photon detector again and survey, single-photon detector sends to receiving terminal FPGA by detection data, obtains original vol sub-key; Synchronizable optical detector is sent on another road, and the output of this synchronizable optical detector has two kinds, and a kind of is synchronizing signal, and a kind of is key agreement signal; These two kinds of signals carry out selectivity output by control circuit.For the synchronizing signal of 1 MHZ, it can not be directly used in and carry out synchronous to quantum key signal, the FPGA of receiving terminal needs by inner PLL module 1MHZ signal frequency multiplication, to 200MHZ, of this 200MHZ signal, quantum key signal to be made synchronously after receiving 1MHZ synchronizing signal.Key agreement signal is just once to transmit after QKD often sends a frame quantum signal.
3, transmitting terminal and receiving terminal are distinguished the process of synchronizable optical signal and key agreement signal: transmitting terminal and receiving terminal are only just had ready conditions to identify and judged current time which kind of signal this sends or which kind of signal what receive be after having determined both sides' the sequential of communicating by letter, so QKD wanted first to send separately a frame synchronization light signal before transmission security key, because PLL frequency multiplication needs certain hour stable, so must meeting PLL frequency multiplication, this frame synchronizing signal length locks the required time.When completing both sides, PLL frequency multiplication just can determine sequential relationship separately by this synchronizing signal.Both sides must determine sequential relationship and data transmission format separately under the host-host protocol of appointing in advance.Once sequential is determined, transmitting terminal just can be take synchronizable optical pulse and periodically be sent key agreement signal as the reference time, receiving terminal periodically switches the output of synchroprobe circuit as a reference with synchronizing signal too, if be synchronizable optical from the current signal of time judgement, with regard to synchroprobe, synchronization signal processing circuit is sent in output so, if key agreement signal, is outputted to synchroprobe negotiation data treatment circuit.
The full optical fiber telecommunications system of this quantum key dispatching system adopts the mode of time-sharing multiplex that three kinds of signals are placed in an optical fiber and are transmitted, removed netting twine connection, and send key agreement signal and synchrodata with synchronizable optical laser time-sharing multiplex, make QKD break away from the dependence to classical ethernet communication, greatly promoted the fail safe of QKD system.
Accompanying drawing explanation
Fig. 1 is the structural representation of traditional Q KD data communication system.
Fig. 2 is structural representation of the present invention.
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described further.
Embodiment
embodiment 1
Referring to Fig. 2, the full optical fiber telecommunications system of this quantum key dispatching system, comprise transmitting terminal and receiving terminal, described transmitting terminal comprises transmitting terminal FPGA, quantum light laser Laser1, synchronizable optical and the multiplexing laser Laser2 of classical signals, transmitting terminal operating system, transmitting terminal quantum signal modulating system, transmitting terminal wavelength division multiplexer DWDM; Described receiving terminal comprises receiving terminal FPGA, single-photon detector SPD, synchronizable optical detector, receiving terminal quantum signal demodulating system, receiving terminal wavelength division multiplexer DWDM, receiving terminal operating system; The light frequency of the multiplexing laser Laser2 transmission of quantum light laser Laser1 and synchronizable optical and classical signals is not identical; Described quantum light laser Laser1, synchronizable optical and the multiplexing laser Laser2 of classical signals and transmitting terminal operating system are electrically connected to transmitting terminal FPGA respectively; Single-photon detector SPD, synchronizable optical detector and receiving terminal operating system are electrically connected to receiving terminal FPGA respectively; Quantum light laser Laser1 is used for sending quantum key signal to transmitting terminal quantum signal modulating system; Transmitting terminal will send to transmitting terminal wavelength division multiplexer DWDM after quantum signal coding; The multiplexing laser Laser2 of described synchronizable optical and classical signals sends synchronizable optical signal and key agreement signal to transmitting terminal wavelength division multiplexer DWDM in the mode of time-sharing multiplex; In the synchronizable optical signal that the quantum light that described transmitting terminal wavelength division multiplexer DWDM sends transmitting terminal quantum signal modulating system and synchronizable optical and the multiplexing laser Laser2 of classical signals send and key agreement signal loading to optical fiber and send to receiving terminal wavelength division multiplexer DWDM; Receiving terminal wavelength division multiplexer DWDM is divided into two-way light by the light of two kinds of wavelength that receive, Bing Jiang mono-road light sends to receiving terminal quantum signal demodulating system, after demodulation, send into again single-photon detector, single-photon detector sends to receiving terminal FPGA by detection data after quantum light is surveyed, and forms original vol sub-key; Receiving terminal wavelength division multiplexer DWDM sends another road light into synchronizable optical detector simultaneously, and synchronizable optical detector output synchronizing signal and key agreement signal are to receiving terminal FPGA; Receiving terminal FPGA receives after synchronizing signal, quantum key signal is done synchronously.Synchronizable optical detector comes selectivity output synchronizing signal and key agreement signal to receiving terminal FPGA by control circuit.The transmission frequency of quantum light laser Laser1 is 200MHZ, and the quantum optical wavelength of transmitting is 1550.92nm; The light frequency of the multiplexing laser Laser2 transmitting of synchronizable optical and classical signals is 1MHZ; Receiving terminal FPGA receives after synchronizing signal, and synchronizing signal frequency multiplication is also done synchronously quantum key signal by the synchronizing signal of this 200MHZ to 200MHZ.Quantum light is different with synchronizable optical frequency, still adopts low frequency synchronizable optical signal in high frequency content sub-key transmitting procedure, and utilizes clock recovery gain-of-function high-speed synchronous signal at receiving terminal, and 200MHZ illustrates systematic procedure.
Claims (3)
1. a full optical fiber telecommunications system for quantum key dispatching system, comprises transmitting terminal and receiving terminal, it is characterized in that:
Described transmitting terminal comprises transmitting terminal FPGA, quantum light laser Laser1, synchronizable optical and the multiplexing laser Laser2 of classical signals, transmitting terminal operating system, transmitting terminal quantum signal modulating system, transmitting terminal wavelength division multiplexer DWDM;
Described receiving terminal comprises receiving terminal FPGA, single-photon detector SPD, synchronizable optical detector, receiving terminal quantum signal demodulating system, receiving terminal wavelength division multiplexer DWDM, receiving terminal operating system;
The light frequency of the multiplexing laser Laser2 transmission of quantum light laser Laser1 and synchronizable optical and classical signals is not identical;
Described quantum light laser Laser1, synchronizable optical and the multiplexing laser Laser2 of classical signals and transmitting terminal operating system are electrically connected to transmitting terminal FPGA respectively; Single-photon detector SPD, synchronizable optical detector and receiving terminal operating system are electrically connected to receiving terminal FPGA respectively;
Quantum light laser Laser1 is used for sending quantum key signal to transmitting terminal quantum signal modulating system; Transmitting terminal quantum signal modulating system will send to transmitting terminal wavelength division multiplexer DWDM after quantum signal coding; The multiplexing laser Laser2 of described synchronizable optical and classical signals sends synchronizable optical signal and key agreement signal to transmitting terminal wavelength division multiplexer DWDM in the mode of time-sharing multiplex; In the synchronizable optical signal that the quantum light that described transmitting terminal wavelength division multiplexer DWDM sends transmitting terminal quantum signal modulating system and synchronizable optical and the multiplexing laser Laser2 of classical signals send and key agreement signal loading to optical fiber and send to receiving terminal wavelength division multiplexer DWDM;
Receiving terminal wavelength division multiplexer DWDM is divided into two-way light by the light of two kinds of wavelength that receive, Bing Jiang mono-road light sends to receiving terminal quantum signal demodulating system, after demodulation, send into again single-photon detector, single-photon detector sends to receiving terminal FPGA by detection data after quantum light is surveyed, and forms original vol sub-key; Receiving terminal wavelength division multiplexer DWDM sends another road light into synchronizable optical detector simultaneously, and synchronizable optical detector output synchronizing signal and key agreement signal are to receiving terminal FPGA; Receiving terminal FPGA receives after synchronizing signal, quantum key signal is done synchronously.
2. the full optical fiber telecommunications system of quantum key dispatching system according to claim 1, is characterized in that: synchronizable optical detector comes selectivity output synchronizing signal and key agreement signal to receiving terminal FPGA by control circuit.
3. the full optical fiber telecommunications system of quantum key dispatching system according to claim 2, is characterized in that: the transmission frequency of quantum light laser Laser1 is 200MHZ, and the quantum optical wavelength of transmitting is 1550.92nm; The light frequency of the multiplexing laser Laser2 transmitting of synchronizable optical and classical signals is 1MHZ; Receiving terminal FPGA receives after synchronizing signal, and synchronizing signal frequency multiplication is also done synchronously quantum key signal by the synchronizing signal of this 200MHZ to 200MHZ.
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103840905A (en) * | 2014-02-20 | 2014-06-04 | 安徽问天量子科技股份有限公司 | Full optical fiber communication system and method of QKD system |
| CN104202157A (en) * | 2014-09-16 | 2014-12-10 | 安徽量子通信技术有限公司 | Quantum key distribution (QKD) system synchronization method and device |
| CN104486317A (en) * | 2014-12-08 | 2015-04-01 | 国家电网公司 | Common-optical fiber transmission method for multiuser quantum key distribution of power systems |
| CN107465502A (en) * | 2016-06-02 | 2017-12-12 | 华为技术有限公司 | A kind of quantum communications method and relevant apparatus |
| CN108337088A (en) * | 2018-02-08 | 2018-07-27 | 中国人民解放军战略支援部队信息工程大学 | Single fiber merges quantum key distribution system, method and related system, method |
| 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 |
| WO2018232575A1 (en) * | 2017-06-19 | 2018-12-27 | 华为技术有限公司 | Photon detection system |
| CN110546915A (en) * | 2017-01-23 | 2019-12-06 | 约翰内斯堡金山大学 | Method and system for hybrid classical quantum communication |
| CN110868293A (en) * | 2019-12-03 | 2020-03-06 | 国开启科量子技术(北京)有限公司 | Time division multiplexing high-speed QKD system and method |
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2014
- 2014-02-20 CN CN201420073229.3U patent/CN203813797U/en not_active Expired - Lifetime
Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103840905A (en) * | 2014-02-20 | 2014-06-04 | 安徽问天量子科技股份有限公司 | Full optical fiber communication system and method of QKD system |
| CN104202157B (en) * | 2014-09-16 | 2018-01-02 | 科大国盾量子技术股份有限公司 | The synchronous method and device of a kind of quantum key distribution system |
| CN104202157A (en) * | 2014-09-16 | 2014-12-10 | 安徽量子通信技术有限公司 | Quantum key distribution (QKD) system synchronization method and device |
| CN104486317A (en) * | 2014-12-08 | 2015-04-01 | 国家电网公司 | Common-optical fiber transmission method for multiuser quantum key distribution of power systems |
| CN104486317B (en) * | 2014-12-08 | 2017-12-01 | 国家电网公司 | A kind of common fine transmission method of multi-user quantum encryption key distribution for power system |
| US10778341B2 (en) | 2016-06-02 | 2020-09-15 | Huawei Technologies Co., Ltd. | Quantum communication method and related apparatus |
| CN107465502A (en) * | 2016-06-02 | 2017-12-12 | 华为技术有限公司 | A kind of quantum communications method and relevant apparatus |
| CN110546915A (en) * | 2017-01-23 | 2019-12-06 | 约翰内斯堡金山大学 | Method and system for hybrid classical quantum communication |
| CN110546915B (en) * | 2017-01-23 | 2022-10-04 | 约翰内斯堡金山大学 | Method and system for hybrid classical quantum communication |
| WO2018232575A1 (en) * | 2017-06-19 | 2018-12-27 | 华为技术有限公司 | Photon detection system |
| CN109429508A (en) * | 2017-06-19 | 2019-03-05 | 华为技术有限公司 | A kind of photon detection system |
| CN108337088A (en) * | 2018-02-08 | 2018-07-27 | 中国人民解放军战略支援部队信息工程大学 | Single fiber merges quantum key distribution system, method and related system, method |
| CN108337088B (en) * | 2018-02-08 | 2021-01-22 | 中国人民解放军战略支援部队信息工程大学 | Single-fiber fusion quantum key distribution system and method and related system and method |
| 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 |
| CN110868293A (en) * | 2019-12-03 | 2020-03-06 | 国开启科量子技术(北京)有限公司 | Time division multiplexing high-speed QKD system and method |
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Address after: 241003 No. 12, Zhanghe Road, hi tech Zone, Anhui, Wuhu Patentee after: ANHUI ASKY QUANTUM TECHNOLOGY Co.,Ltd. Address before: 241002 Anhui science and technology innovation public service center, Wuhu national hi tech Zone, Yijiang Patentee before: ANHUI ASKY QUANTUM TECHNOLOGY Co.,Ltd. |
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