A quantum communication system based on quantum solid-state storage

Abstract

The utility model discloses a quantum communication system based on quantum solid state storage, include: Alice end, main control board, Bob end, quantum solid state storage device and Charlie end, wherein, quantum solid state storage device sets up respectively at Alice end and Bob end, stores and releases light with the mode of photon echo, and the storage time is decided by the time interval of pump light and signal light that main control board regulates according to the time difference delta t of reference light reaching Alice end and Bob end, to realize the buffer of quantum state, buffer time and release, the utility model discloses through quantum solid state memory stores and releases signal light with the mode of photon echo, can compensate the loss that signal light caused when transmitting simultaneously, realizes the buffer of entangled photon pair resources and clock scheduling, has improved quantum communication system, quantum computation's stability and efficiency greatly.

Description

TECHNICAL FIELD

[0001] The utility model relates to quantum solid-state storage and quantum computing field, concretely relates to a quantum communication system based on quantum solid-state storage. BACKGROUND

[0002] Quantum communication is currently a unconditional secure communication mode based on physical principles. At present, the main challenge faced by quantum communication is to realize long-distance quantum communication. Photons are the natural carriers of quantum communication, however, due to the insurmountable channel loss, the transmission distance of photons is very limited. For this reason, people have proposed a quantum relay scheme based on quantum memory and quantum entanglement exchange.

[0003] Quantum solid-state memory (QSM) function is to store quantum states in optical signals into material systems, after precise controllable time, the stored quantum states can be restored to optical signals through certain control signals, for quantum communication or quantum information processing; That is, it can capture these entangled photons in time, and release them when needed, so as to allow more efficient resource management and use, improve the stability and efficiency of the communication system.

[0004] Entangled photon pairs are the basic resources of many quantum communication protocols, but their generation is often random and uncontrollable. The randomness of the photon pairs generated by the entangled light source leads to low resource utilization efficiency. In quantum communication protocols requiring high time accuracy, solid-state memory can be used as a time buffer to help synchronize the operations of remote quantum nodes, which is crucial for realizing precise quantum state manipulation and entanglement distribution.

[0005] Therefore, it is necessary to improve the existing quantum communication system and quantum computing, and introduce solid-state memory to improve the stability and efficiency of the communication system. Utility model content

[0006] In order to solve the above technical problems, a kind of entangled photon pair resource buffer and clock scheduling is proposed, which improves the stability and efficiency of communication system quantum communication system based on quantum solid-state storage.

[0007] To achieve the above purpose, the technical scheme adopted by the utility model is as follows: a quantum communication system based on quantum solid-state storage, characterized by comprising:

[0008] Alice end, for generating quantum signal light for transmission, and monitoring the arrival time of reference light from Charlie end, transmitting the time information to the main control board;

[0009] Bob end, for generating quantum signal light for transmission, and monitoring the arrival time of reference light from Charlie end, and transmitting the time information to the master board;

[0010] the master board, for controlling Alice end and Bob end to generate quantum signal light states meeting the requirements, and regulating the time interval of the pump light and the quantum signal light generated by Alice end and Bob end according to the time difference Δt of the arrival of the reference light at Alice end and Bob end sent by Charlie end, to realize the caching, buffering time and releasing of quantum states in the quantum solid-state storage device, so as to ensure the time consistency of the quantum signal light generated by Alice end and Bob end to reach Charlie end, and realize clock synchronization;

[0011] Charlie end, as a third-party detection end, for detecting the entangled photon pairs generated by Alice end and Bob end, and publishing the detection results, and Alice end and Bob end obtaining the original key according to the detection results; Charlie end is also responsible for sending reference light to Alice end and Bob end to solve the problem of different arrival times of signal light caused by optical path difference;

[0012] quantum solid-state storage device, respectively arranged at Alice end and Bob end, for storing and releasing light in the form of photon echo, and the storage time is determined by the master board according to the time difference Δt of the arrival of the reference light at Alice end and Bob end, to regulate the time interval of the pump light and the signal light, to realize the caching, buffering time and releasing of quantum states.

[0013] Preferably, the master board is further configured to:

[0014] receive the arrival time information of the reference light fed back by Alice end and Bob end;

[0015] calculate the optical path difference Δt between Alice end and Bob end;

[0016] regulate the time interval of the pump light loaded on the quantum solid-state storage device and the signal light generated by Alice end and Bob end according to the calculated optical path difference Δt, to ensure that the quantum signal light generated by Alice end and Bob end can reach Charlie end at the same time.

[0017] Preferably, the quantum solid-state storage device realizes the caching and releasing of quantum states through the photon echo effect, specifically:

[0018] the master board first controls the pump light to enter the quantum solid-state storage device;

[0019] then controls the quantum signal light generated by Alice end or Bob end to enter the quantum solid-state storage device;

[0020] After a preset time interval, pump light of the same frequency and intensity is sent into the quantum solid-state memory again. The quantum solid-state memory releases the same light as the previously sent quantum signal light according to the photon echo effect, thereby realizing the buffering and release of quantum states.

[0021] Preferably, the Charlie end detects the entangled photon pairs generated by the Alice and Bob ends and publishes the detection results, enabling the Alice and Bob ends to generate a secure raw key based on the results.

[0022] Preferably, the system also includes a communication link for transmitting signal light and reference light between Alice, Bob, Charlie and the main control board.

[0023] The beneficial technical effects of this invention are as follows: The quantum solid-state memory uses photon echo to store and release signal light, and can compensate for the loss of signal light during transmission. It realizes the caching and clock scheduling of entangled photons for resources, which greatly improves the stability and efficiency of quantum communication systems and quantum computing. Attached Figure Description

[0024] Fig. 1 This is a block diagram of the overall structure of quantum communication based on quantum solid-state storage according to the present invention.

[0025] Fig. 2 This describes the clock synchronization process in this utility model. Detailed Implementation

[0026] To make the objectives, technical solutions and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the embodiments. However, the scope of protection of this utility model is not limited to the specific embodiments described below.

[0027] like Figs. 1-2 As shown, a quantum communication system based on quantum solid-state storage includes an Alice terminal 101, a main control board 102, a Bob terminal 103, a quantum solid-state storage device 104, and a Charlie terminal 105, wherein:

[0028] Alice end 101 is used to generate the quantum signal light for transmission and monitor the arrival time of the reference light from Charlie end, and transmit the time information to the main control board.

[0029] Bob end 103 is used to generate the transmitted quantum signal light and monitor the arrival time of the reference light from Charlie end, and transmit the time information to the main control board.

[0030] In this implementation, Alice terminal 101 and Bob terminal 103 are symmetrical and have the same function.

[0031] The master board 102 is used to control the Alice end 101 and the Bob end 103 to generate the required quantum signal light state, and according to the time difference Δt of the reference light sent by the Charlie end 105 to reach the Alice end 101 and the Bob end 103, the time interval of the pump light and the quantum signal light generated by the Alice end 101 and the Bob end 103 is adjusted to realize the caching, buffering time and releasing of the quantum state in the quantum solid-state storage device, so as to ensure that the quantum signal light generated by the Alice end 101 and the Bob end 103 reaches the Charlie end 105 at the same time, and clock synchronization is realized.

[0032] Here, the above functions of the master board 102 are mainly completed by the existing integrated chip, and the new disk model used here is XC6SLX150-1FGG676C of the Xilinx® series.

[0033] The Charlie end 105, as a third-party detection end, is used to detect the entangled photon pairs generated by the Alice end 101 and the Bob end 103 and publish the detection results, and the Alice end 101 and the Bob end 103 obtain the original key according to the detection results. This part of the function is realized by using the existing quantum communication technology, for example, Bell state detection is used for detection.

[0034] The Charlie end 105 is also responsible for sending reference light to the Alice end 101 and the Bob end 105 to solve the problem of different arrival times of signal light caused by optical path difference;

[0035] The quantum solid-state storage device is arranged at the Alice end 101 and the Bob end 105 respectively, and uses the photon echo method to store and release light. The storage time is determined by the master board according to the time difference Δt of the reference light reaching the Alice end 101 and the Bob end 105 to adjust the time interval of the pump light and the signal light, so as to realize the caching, buffering time and releasing of the quantum state.

[0036] In addition, the master board 102 is also used to:

[0037] Receive the reference light arrival time information fed back by the Alice end 101 and the Bob end 103;

[0038] Calculate the optical path difference Δt between the Alice end 101 and the Bob end 103;

[0039] ​According to the calculated optical path difference At, the time interval of the pump light loaded on the quantum solid-state storage device and the signal light generated by Alice end 101 and Bob end 103 is regulated to ensure that the quantum signal light generated by Alice end and Bob end can reach Charlie end 105 at the same time, thereby realizing time synchronization.

[0040] The quantum solid-state storage device 104 realizes the caching and releasing of quantum states through the photon echo effect, specifically:

[0041] The main control board 102 first controls the pump light to enter the quantum solid-state memory 104;

[0042] Then control the quantum signal light generated by Alice end 101 or Bob end 103 to enter the quantum solid-state memory 104;

[0043] After a preset time interval, the same frequency and intensity of pump light is sent into the quantum solid-state memory 104 again, and the quantum solid-state memory 104 releases the same light as the previously entered quantum signal light according to the photon echo effect, thereby realizing the caching and releasing of quantum states.

[0044] Charlie end 105 detects the entangled photon pairs generated by Alice end 101 and Bob end 103 and publishes the detection results, so that Alice end 101 and Bob end 103 can generate a secure original key based on the results.

[0045] The system also includes a communication link for transmitting signal light and reference light between Alice end 101, Bob end 103, Charlie end 105 and main control board 102.

[0046] Specifically, the specific working process of the utility model is as follows:

[0047] First, Charlie end 105 simultaneously generates two paths of reference light with the same characteristics of frequency and wavelength to Alice end 101 and Bob end 102, and Alice end 101 and Bob end 103 record the arrival time T a1 And T b1 Of the reference light and feed back to the main control board for recording.

[0048] Next, the main control board 103 calculates the arrival time fed back by Alice end 101 and Bob end 102 to obtain the optical path difference At, At = |T a1 -T b1| The host board 103 controls the pumping light loaded on the quantum solid state storage device 104 and the signal light of the Alice end and the Bob end, and through modulating the time difference of the pumping light and the signal light of the Alice end and the Bob end, the quantum state is cached and released by using the photon echo effect to achieve the process of clock synchronization, as shown in Fig. 2 .

[0049] As shown in Fig. 2 , the pumping light generated by the host board 103 is first emitted into the quantum solid state storage device 104 of the Alice end 101, and then the generated signal light of the Alice end 101 is controlled to be emitted into the quantum solid state storage device 104, and the time difference between the pumping light and the signal light is t A , according to the photon echo effect, if the same frequency and intensity of the pumping light is sent into the quantum solid state storage device 104 after a period of time, the quantum solid state storage device will emit the same light as the signal light emitted by the Alice end 101 into the quantum solid state storage device, and the time interval between the two is t A , so as to realize the storage and release of the signal light.

[0050] Similarly, the pumping light generated by the host board 103 is first emitted into the quantum solid state storage device 104 of the Bob end 102, and then the generated signal light of the Bob end 102 is controlled to be emitted into the quantum solid state storage device 104, and the time difference between the pumping light and the signal light is t B , according to the photon echo effect, if the same frequency and intensity of the pumping light is sent into the quantum solid state storage device 104 after a period of time, the quantum solid state storage device will emit the same light as the signal light emitted by the Alice end 101 into the quantum solid state storage device, and the time interval between the two is t B , so as to realize the storage and release of the signal light.

[0051] The host board 103 controls the time difference between t A and t B to be just Δt, so as to just compensate for the time difference caused by the difference in the distance of the signal light emitted by the Alice end 101 and the Bob end 102 to the Charlie end.

[0052] Meanwhile, the quantum solid state storage device 104 can compensate for the loss caused by the transmission of the signal light, and can greatly increase the transmission distance.

[0053] In the utility model, the quantum solid state storage device stores and releases the signal light in the form of photon echo, can compensate for the loss caused by the transmission of the signal light, realizes the caching and clock scheduling of entangled photon pairs, and greatly improves the stability and efficiency of the communication system.

[0054] According to the disclosure and teaching of the above description, the skilled in the art of the utility model can also change and modify the above-mentioned embodiments. Therefore, the utility model is not limited to the specific embodiments disclosed and described above, and some modifications and changes of the utility model should fall within the protection scope of the claims of the utility model. In addition, although some specific terms are used in the specification, these terms are only for convenience of description and do not constitute any limitation on the utility model.

Claims

1. A quantum communication system based on quantum solid-state storage, characterized in that, The system comprises: an Alice terminal for generating quantum signal light for transmission and monitoring the arrival time of reference light from the Charlie terminal and transmitting the time information to the main control board; a Bob terminal for generating quantum signal light for transmission and monitoring the arrival time of reference light from the Charlie terminal and transmitting the time information to the main control board; a main control board for controlling the Alice terminal and the Bob terminal to generate quantum signal light in a required state, regulating the time interval of the pump light and the quantum signal light generated by the Alice terminal and the Bob terminal according to the time difference Δt of the arrival of the reference light from the Charlie terminal at the Alice terminal and the Bob terminal, so as to realize the caching, buffering time and release of the quantum state in the quantum solid-state storage device, thereby ensuring that the quantum signal light generated by the Alice terminal and the Bob terminal arrives at the Charlie terminal at the same time and realizing clock synchronization; a Charlie terminal as a third-party detection terminal for detecting the entangled photon pairs generated by the Alice terminal and the Bob terminal and publishing the detection results, so that the Alice terminal and the Bob terminal can obtain the original key based on the detection results; the Charlie terminal is also responsible for sending reference light to the Alice terminal and the Bob terminal to solve the problem of different arrival times of the signal light due to the optical path difference; a quantum solid-state storage device arranged at the Alice terminal and the Bob terminal respectively, which stores and releases light in the form of photon echo, and the storage time is determined by the time interval of the pump light and the signal light regulated by the main control board according to the time difference Δt of the arrival of the reference light at the Alice terminal and the Bob terminal, so as to realize the caching, buffering time and release of the quantum state.

2. The quantum communication system of claim 1, wherein, The main control board is also used for: receiving the arrival time information of the reference light fed back by the Alice terminal and the Bob terminal; calculating the optical path difference Δt between the Alice terminal and the Bob terminal; regulating the time interval of the pump light loaded on the quantum solid-state storage device and the signal light generated by the Alice terminal and the Bob terminal according to the calculated optical path difference Δt, so as to ensure that the quantum signal light generated by the Alice terminal and the Bob terminal can arrive at the Charlie terminal at the same time.

3. The quantum communication system of claim 1, wherein, The quantum solid-state storage device realizes the caching and release of the quantum state through the photon echo effect, specifically as follows: the main control board first controls the pump light to enter the quantum solid-state storage device; then controls the quantum signal light generated by the Alice terminal or the Bob terminal to enter the quantum solid-state storage device; after a preset time interval, the same frequency and intensity of pump light is sent into the quantum solid-state storage device again, and the quantum solid-state storage device releases the same light as the previously entered quantum signal light according to the photon echo effect, thereby realizing the caching and release of the quantum state.

4. The quantum communication system of claim 1, wherein, The Charlie terminal detects the entangled photon pairs generated by the Alice terminal and the Bob terminal and publishes the detection results, so that the Alice terminal and the Bob terminal can generate a secure original key based on the results.

5. The quantum communication system of any one of claims 1 to 4, wherein, The system further comprises a communication link for transmitting signal light and reference light between the Alice terminal, the Bob terminal, the Charlie terminal and the main control board.

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