CN116192278B - Optimizing method, device, medium and equipment for quantum communication system - Google Patents
Optimizing method, device, medium and equipment for quantum communication system Download PDFInfo
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Abstract
The invention provides an optimizing method, a device, a medium and equipment for a quantum communication system, wherein the method comprises the following steps: repeatedly executing an instruction sequence for controlling the light source to output light pulses; acquiring single photon counting sequences detected at each delay position of the single photon detector; acquiring the sequence of each instruction in an instruction sequence obtained through each cyclic shift operation; calculating correlation coefficients between the single photon counting sequences detected at the respective delay positions and the instruction sequences obtained via each cyclic shift operation; the delay position of the single photon detector and the ordering of the instructions in the instruction sequence are respectively locked to the delay position of the single photon detector and the ordering of the instructions in the instruction sequence corresponding to the maximum value in the calculated correlation coefficient. The invention enables the transmitting end and the receiving end to be positioned to the same light pulse to ensure that the light pulse from the transmitting end is correctly detected in the receiving end.
Description
Technical Field
The present invention relates to the field of quantum communications technologies, and in particular, to a method, an apparatus, a medium, and a device for optimizing a quantum communication system.
Background
In quantum communication systems, such as quantum key distribution systems, the transmitting end is used to encode the transmitted light pulses and the receiving end is used to decode the received light pulses, so that the operation of the transmitting end and the operation of the receiving end must be kept synchronized and positioned to the same light pulses to ensure that the light pulses from the transmitting end are correctly detected and marked in the receiving end. However, in the related art, although it is possible to ensure that the transmitting end and the receiving end operate the optical pulse train at the same frequency by the code clock generated by the transmitting end, it is not ensured that the transmitting end and the receiving end are positioned to the same optical pulse, which makes the optical pulse from the transmitting end not be correctly detected and marked in the receiving end, thereby reducing the rate of the system. Therefore, ensuring that the transmitting end and the receiving end can be accurately positioned on the same light pulse has a critical effect on improving the system's code rate.
Disclosure of Invention
The invention aims to provide an optimizing method, device, medium and equipment for a quantum communication system.
According to an aspect of the present invention, there is provided a method of optimizing for a quantum communication system, the method comprising: repeatedly executing an instruction sequence for controlling the light source to output light pulses; changing delay positions of a single photon detector for receiving light pulses according to a predetermined step size to obtain a single photon counting sequence detected at each delay position of the single photon detector; performing cyclic shift operation on each instruction in the instruction sequence according to the length of the instruction sequence to acquire the sequence of each instruction in the instruction sequence obtained through each cyclic shift operation; calculating correlation coefficients between the single photon counting sequence detected at each delay position of the single photon detector and the instruction sequence obtained through each cyclic shift operation; acquiring a delay position of the single photon detector corresponding to the maximum value in the calculated correlation coefficient and sequencing of each instruction in the instruction sequence; locking the delay position of the single photon detector and the ordering of the instructions in the instruction sequence to the acquired delay position of the single photon detector and the ordering of the instructions in the acquired instruction sequence, respectively, wherein the light source is included in an emitting end of the quantum communication system, and the single photon detector is included in a receiving end of the quantum communication system.
According to one embodiment of the present invention, the coding mode of the quantum communication system is based on at least one of polarization coding, time coding, phase coding and time phase coding.
According to one embodiment of the invention, each instruction in the sequence of instructions comprises luminescent information or non-luminescent information.
According to one embodiment of the invention, the cyclic shift operation includes at least one of a cyclic left shift operation and a cyclic right shift operation.
According to one embodiment of the present invention, the step of performing a cyclic shift operation on each instruction in the instruction sequence according to the length of the instruction sequence includes: determining the number of times of performing circular left shift operation on each instruction in the instruction sequence according to the length of the instruction sequence, and circularly shifting one bit leftwards each time, wherein the instruction of the forefront one bit in the instruction sequence is shifted to the rearmost one bit in the instruction sequence, and other instructions except the instruction of the forefront one bit in the instruction sequence are respectively shifted forwards by one bit.
According to one embodiment of the present invention, the step of performing a cyclic shift operation on each instruction in the instruction sequence according to the length of the instruction sequence includes: determining the times of performing circular right shift operation on each instruction in the instruction sequence according to the length of the instruction sequence, and circularly shifting one bit to the right each time, wherein the instruction in the rearmost bit in the instruction sequence is shifted to the foremost bit in the instruction sequence, and other instructions except the instruction in the rearmost bit in the instruction sequence are respectively shifted backwards by one bit.
According to one embodiment of the invention, the length of the instruction sequence is the same as the length of the single photon counting sequence.
According to one embodiment of the invention, execution of each instruction in the sequence of instructions and acquisition of each single photon count in the sequence of single photon counts is synchronized with a coding clock of the quantum communication system.
According to another aspect of the present invention, there is also provided an optimizing apparatus for a quantum communication system, the apparatus comprising: a light pulse output control unit configured to repeatedly execute a sequence of instructions for controlling the light source to output light pulses; a photon counting acquisition unit configured to change delay positions of a single photon detector for receiving light pulses by a predetermined step length to acquire a single photon counting sequence detected at each delay position of the single photon detector; a cyclic shift operation unit configured to perform cyclic shift operation on ordering positions of respective instructions in the instruction sequence according to a length of the instruction sequence, so as to obtain ordering of the respective instructions in the instruction sequence obtained via each cyclic shift operation; a correlation coefficient calculation unit configured to calculate a correlation coefficient between a single photon count sequence detected at each delay position of the single photon detector and the instruction sequence obtained via each cyclic shift operation; a correlation coefficient optimizing unit configured to acquire a delay position of the single photon detector corresponding to a maximum value in the calculated correlation coefficient and an order of respective instructions in the instruction sequence; a system position locking unit configured to lock the delay position of the single photon detector and the ordering of the individual instructions in the instruction sequence to the acquired delay position of the single photon detector and the ordering of the individual instructions in the acquired instruction sequence, respectively, wherein the light source is included in the transmitting end of the quantum communication system and the single photon detector is included in the receiving end of the quantum communication system.
According to one embodiment of the present invention, the coding mode of the quantum communication system is based on at least one of polarization coding, time coding, phase coding and time phase coding.
According to one embodiment of the invention, each instruction in the sequence of instructions comprises luminescent information or non-luminescent information.
According to one embodiment of the invention, the cyclic shift operation includes at least one of a cyclic left shift operation and a cyclic right shift operation.
According to an embodiment of the present invention, the cyclic shift operation unit is further configured to: determining the number of times of performing circular left shift operation on each instruction in the instruction sequence according to the length of the instruction sequence, and circularly shifting one bit leftwards each time, wherein the instruction of the forefront one bit in the instruction sequence is shifted to the rearmost one bit in the instruction sequence, and other instructions except the instruction of the forefront one bit in the instruction sequence are respectively shifted forwards by one bit.
According to an embodiment of the present invention, the cyclic shift operation unit is further configured to: determining the times of performing circular right shift operation on each instruction in the instruction sequence according to the length of the instruction sequence, and circularly shifting one bit to the right each time, wherein the instruction in the rearmost bit in the instruction sequence is shifted to the foremost bit in the instruction sequence, and other instructions except the instruction in the rearmost bit in the instruction sequence are respectively shifted backwards by one bit.
According to one embodiment of the invention, the length of the instruction sequence is the same as the length of the single photon counting sequence.
According to one embodiment of the invention, execution of each instruction in the sequence of instructions and acquisition of each single photon count in the sequence of single photon counts is synchronized with a coding clock of the quantum communication system.
According to another aspect of the invention there is also provided a computer readable storage medium storing a computer program which, when executed by a processor, implements a method of optimizing a quantum communication system as described hereinbefore.
According to another aspect of the present invention, there is also provided a computer apparatus including: a processor; a memory storing a computer program which, when executed by a processor, implements the optimizing method for a quantum communication system as described above.
The optimizing method, the optimizing device, the optimizing medium and the optimizing equipment for the quantum communication system can enable the transmitting end and the receiving end of the quantum communication system to be positioned to the same light pulse so as to ensure that the light pulse from the transmitting end is correctly detected and marked in the receiving end, and therefore the code rate of the system can be improved to a great extent.
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The above objects and features of the present invention will become more apparent from the following description taken in conjunction with the accompanying drawings.
Fig. 1 shows a schematic flow chart of an optimizing method for a quantum communication system according to an exemplary embodiment of the invention.
Fig. 2 is a schematic block diagram illustrating an optimizing apparatus for a quantum communication system according to an exemplary embodiment of the present invention.
Description of the embodiments
Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
Fig. 1 shows a schematic flow chart of an optimizing method for a quantum communication system according to an exemplary embodiment of the invention.
Referring to fig. 1, the method illustrated in fig. 1 may include the following steps.
In step 101, a sequence of instructions for controlling the light source to output light pulses is repeatedly executed.
Here, the light source for outputting the light pulse may be included in the emission end of the quantum communication system, and each instruction in the instruction sequence for controlling the light source to output the light pulse may include light emission information or non-light emission information, for example, the instruction sequence {1,0,0,0,0,0,1,0,0,0,0,0,1,0,0,0,0,0,0,0} may include 20 instructions, where "1" means light emission and "0" means non-light emission. In the transmitting end, execution of each instruction in the instruction sequence {1,0,0,0,0,0,1,0,0,0,0,0,1,0,0,0,0,0,0,0} may be synchronized with a coding clock of the quantum communication system.
In step 102, the delay positions of the single photon detectors for receiving the light pulses are varied by a predetermined step size to obtain a sequence of single photon counts detected at the respective delay positions of the single photon detectors.
Here, a single photon detector for receiving the light pulses may be included in the receiving end of the quantum communication system, whose single photon counts detected at respective delay positions of the single photon detector may be recorded into a single photon count sequence. As an example, the delay position of the single photon detector may be the delay position of the gating signal for the single photon detector, or the delay position of other signals for the single photon detector, which is not limited by the present invention. In addition, in the receiving end, the acquisition of each single photon count in the single photon count sequence may be synchronized with the encoding clock of the quantum communication system, and the number of single photon counts included in the single photon count sequence (i.e., the length of the single photon count sequence) may be the same as the number of instructions included in the instruction sequence (i.e., the length of the instruction sequence). For example, a sequence of single photon counts detected at different Delay positions Delay0, delay1, delay2, delay3, … … of the single photon detector may be recorded for the previously repeatedly executed instruction sequence {1,0,0,0,0,0,1,0,0,0,0,0,1,0,0,0,0,0,0,0}, as shown below.
As can be seen from the above detection data, the single photon count sequence {7,0,0,0,0,0,9,0,0,0,0,0,8,0,0,0,0,0,0,0} detected at Delay0 of the single photon detector may include 20 single photon counts, where "7" indicates 7 photons detected, "9" indicates 9 photons detected, "8" indicates 8 photons detected, and "0" indicates no photons detected. The sequence of single photon counts detected at other Delay positions Delay1, delay2, delay3, … …, etc. is similar thereto, and may also include 20 single photon counts, which are not described in detail herein.
In step 103, a cyclic shift operation is performed on each instruction in the instruction sequence according to the length of the instruction sequence, so as to obtain the order of each instruction in the instruction sequence obtained through each cyclic shift operation.
In one example, step 103 may be implemented using a round-robin left-shifting operation. For example, taking the instruction sequence {1,0,0,0,0,0,1,0,0,0,0,0,1,0,0,0,0,0,0,0} as an example, each instruction in the instruction sequence may be subjected to 20-cycle left shift operations according to the length of the instruction sequence, each time the left cycle is shifted by one bit, the instruction "1" of the first bit in the instruction sequence may be shifted to the last bit in the instruction sequence, and other instructions in the instruction sequence except the instruction "1" of the first bit may be respectively shifted forward by one bit. The ordering of the individual instructions in the instruction sequence via each round of the right shift operation is as follows.
As can be seen from the above loop Shift Left data, the order of the respective instructions in the instruction sequence obtained by the 1 st loop Shift Left 1 operation is {0,0,0,0,0,1,0,0,0,0,0,1,0,0,0,0,0,0,0,1}; the ordering of the instructions in the instruction sequence obtained by the 2 nd-time loop Left Shift operation Shift Left 2 is {0,0,0,0,1,0,0,0,0,0,1,0,0,0,0,0,0,0,1,0}; … … the ordering of the individual instructions in the instruction sequence obtained via the 20 th round Shift Left operation Shift Left 20 reverts to the original ordering of the instruction sequence {1,0,0,0,0,0,1,0,0,0,0,0,1,0,0,0,0,0,0,0}.
In another example, step 103 may be implemented using a round robin right shift operation, for example, continuing to take the instruction sequence {1,0,0,0,0,0,1,0,0,0,0,0,1,0,0,0,0,0,0,0} as an example, each instruction in the instruction sequence may be subject to 20 round robin right shift operations according to the length of the instruction sequence, each time a round robin right shift is performed by one bit, the last one bit of instruction "0" in the instruction sequence may be shifted to the first one bit in the instruction sequence, and other instructions in the instruction sequence except for the last one bit of instruction "0" may be respectively shifted one bit backward. The ordering of the individual instructions in the instruction sequence via each round of the right shift operation is as follows.
As can be seen from the above loop Right Shift data, the order of the respective instructions in the instruction sequence obtained by the 1 st loop Right Shift operation Shift Right 1 is {0,1,0,0,0,0,0,1,0,0,0,0,0,1,0,0,0,0,0,0}; the ordering of the individual instructions in the instruction sequence obtained by the 2 nd round Shift Right 2 operation is {0,0,1,0,0,0,0,0,1,0,0,0,0,0,1,0,0,0,0,0}; … … the ordering of the individual instructions in the instruction sequence obtained via the 20 th round Shift Right 20 operation reverts to the original ordering of the instruction sequence {1,0,0,0,0,0,1,0,0,0,0,0,1,0,0,0,0,0,0,0}.
Therefore, no matter the instruction sequence is subjected to circular left shift operation or circular right shift operation, multiple groups of instruction sequences with different orders can be obtained.
In step 104, correlation coefficients between the sequence of single photon counts detected at the respective delay positions of the single photon detector and the sequence of instructions via each cyclic shift operation are calculated.
In an example of the loop Left Shift operation, a correlation coefficient between the single photon count sequence {7,0,0,0,0,0,9,0,0,0,0,0,8,0,0,0,0,0,0,0} detected at the Delay position Delay0 of the single photon detector and the instruction sequence {0,0,0,0,0,1,0,0,0,0,0,1,0,0,0,0,0,0,0,1} obtained via the 1 st loop Left Shift operation Shift 1, a correlation coefficient between the single photon count sequence {7,0,0,0,0,0,9,0,0,0,0,0,8,0,0,0,0,0,0,0} detected at the Delay position Delay0 of the single photon detector and the instruction sequence {0,0,0,0,1,0,0,0,0,0,1,0,0,0,0,0,0,0,1,0} obtained via the 2 nd loop Left Shift operation Shift 2, a correlation coefficient between … …, and the single photon count sequence {7,0,0,0,0,0,9,0,0,0,0,0,8,0,0,0,0,0,0,0} detected at the Delay position Delay0 of the single photon detector and the instruction sequence {1,0,0,0,0,0,1,0,0,0,0,0,1,0,0,0,0,0,0,0} obtained via the 20 th loop Left Shift operation Shift 20 may be calculated. Similarly, the correlation coefficient between the single photon count sequence detected at the Delay positions Delay1, delay2, delay3, … …, etc. of the single photon detector and the instruction sequence obtained via each cycle of the left shift operation can also be calculated in the same manner.
Similarly, in the example of a cyclic right shift operation, the correlation coefficient between the single photon count sequence detected at the Delay positions Delay0, delay1, delay2, delay3, … …, etc. of the single photon detector and the instruction sequence obtained via each cyclic right shift operation may also be calculated in the same manner. And will not be described in detail herein.
Here, the greater or more recent 1 (e.g., without limitation, 0.98) the correlation coefficient indicates the more relevant between the single photon counting sequence used to calculate the correlation coefficient and the instruction sequence, and thus, when the maximum value occurs among the plurality of correlation coefficients calculated by step 104, the delay position of the corresponding single photon detector and the ordering of the respective instructions in the corresponding instruction sequence may be determined based on the single photon counting sequence used to calculate the correlation coefficient and the instruction sequence. In other words, the quantum communication system may lock or set the delay position of the single photon detector for receiving the light pulses and the ordering of the individual instructions in the sequence of instructions for controlling the light source to output the light pulses based on this, such that the transmitting and receiving ends of the quantum communication system may be positioned to the same light pulse. For this purpose, the following steps may be continued to achieve alignment of the two ends on the light pulse.
In step 105, the delay position of the single photon detector corresponding to the maximum value in the calculated correlation coefficient and the ordering of the individual instructions in the instruction sequence are obtained.
In step 106, the delay position of the single photon detector and the ordering of the instructions in the instruction sequence are locked to the acquired delay position of the single photon detector and the ordering of the instructions in the acquired instruction sequence, respectively.
In addition, the method shown in fig. 1 is applicable to various quantum communication systems, and thus, the encoding mode of the quantum communication system may be based on polarization encoding, time encoding, phase encoding or time phase encoding, or other optical pulse encoding modes, which is not a limitation of the present invention.
It follows that the method shown in fig. 1 enables the transmitting and receiving ends of the quantum communication system to be positioned to the same light pulse to ensure that the light pulse from the transmitting end is correctly detected and marked in the receiving end, which can greatly improve the rate of the system.
Fig. 2 is a schematic block diagram illustrating an optimizing apparatus for a quantum communication system according to an exemplary embodiment of the present invention.
Referring to fig. 2, the apparatus shown in fig. 2 may include at least an optical pulse output control unit 201, a photon count acquisition unit 202, a cyclic shift operation unit 203, a correlation coefficient calculation unit 204, a correlation coefficient optimizing unit 205, and a system position locking unit 206.
In the apparatus shown in fig. 2, the light pulse output control unit 201 may be configured to repeatedly execute a sequence of instructions for controlling the light source to output light pulses; the photon counting acquisition unit 202 may be configured to vary the delay positions of the single photon detector for receiving the light pulses by a predetermined step size to obtain a sequence of single photon counts detected at the respective delay positions of the single photon detector; the cyclic shift operation unit 203 may be configured to perform a cyclic shift operation on the ordering positions of the respective instructions in the instruction sequence according to the length of the instruction sequence, so as to obtain the ordering of the respective instructions in the instruction sequence obtained via each cyclic shift operation; the correlation coefficient calculation unit 204 may be configured to calculate a correlation coefficient between the single photon counting sequence detected at each delay position of the single photon detector and the instruction sequence obtained via each cyclic shift operation; the correlation coefficient optimizing unit 205 may be configured to obtain the delay position of the single photon detector corresponding to the maximum value in the calculated correlation coefficient and the ordering of the individual instructions in the instruction sequence; the system position locking unit 206 may be configured to lock the delay position of the single photon detector and the ordering of the individual instructions in the instruction sequence to the acquired delay position of the single photon detector and the ordering of the individual instructions in the acquired instruction sequence, respectively.
In the apparatus shown in fig. 2, the light source may be included in the transmitting end of the quantum communication system and the single photon detector may be included in the receiving end of the quantum communication system.
In the apparatus shown in fig. 2, each instruction in the instruction sequence may include light emitting information or non-light emitting information, and the length of the instruction sequence may be the same as the length of the single photon counting sequence. Execution of each instruction in the sequence of instructions and acquisition of each single photon count in the sequence of single photon counts may be synchronized with a coding clock of the quantum communication system.
In one example, the cyclic shift operation unit 203 may be further configured to determine the number of times of cyclic left shift operation on each instruction in the instruction sequence according to the length of the instruction sequence, each time one bit of cyclic left shift is performed, the first one bit of instruction in the instruction sequence is moved to the last one bit in the instruction sequence, and other instructions in the instruction sequence except for the first one bit of instruction are respectively moved forward by one bit.
In another example, the cyclic shift operation unit 203 may be further configured to determine the number of times of performing cyclic right shift operation on each instruction in the instruction sequence according to the length of the instruction sequence, each time a bit is shifted right circularly, the last one bit of the instruction in the instruction sequence is shifted to the foremost one bit in the instruction sequence, and other instructions in the instruction sequence except for the last one bit are respectively shifted backward by one bit.
The apparatus shown in fig. 2 is applicable to various quantum communication systems, and thus, the encoding method of the quantum communication system may be based on polarization encoding, time encoding, phase encoding, time phase encoding, or other optical pulse encoding methods, which is not a limitation of the present invention.
It follows that the arrangement shown in fig. 2 also enables the transmitting and receiving ends of the quantum communication system to be positioned to the same light pulse to ensure that the light pulse from the transmitting end is correctly detected and marked in the receiving end, which can greatly improve the rate of the system.
Furthermore, a computer-readable storage medium storing a computer program may also be provided according to an exemplary embodiment of the present invention. The computer readable storage medium stores a computer program which, when executed by a processor, causes the processor to perform an optimizing method for a quantum communication system according to an exemplary embodiment of the present invention. The computer readable recording medium is any data storage device that can store data which can be read out by a computer system. Examples of the computer-readable recording medium include: read-only memory, random access memory, compact disc read-only, magnetic tape, floppy disk, optical data storage device, and carrier waves (such as data transmission through the internet via wired or wireless transmission paths).
Furthermore, a computing device may be provided in accordance with an exemplary embodiment of the present invention. The computing device includes a processor and a memory. The memory is used for storing a computer program. The computer program is executed by a processor to cause the processor to perform a computer program for an optimizing method for a quantum communication system according to an exemplary embodiment of the present invention.
While the present application has been shown and described with reference to the preferred embodiments, it will be understood by those skilled in the art that various modifications and changes may be made to these embodiments without departing from the spirit and scope of the present application as defined by the appended claims.
Claims (18)
1. An optimization method for a quantum communication system, comprising:
repeatedly executing an instruction sequence for controlling the light source to output light pulses;
changing delay positions of a single photon detector for receiving light pulses according to a predetermined step size to obtain a single photon counting sequence detected at each delay position of the single photon detector;
performing cyclic shift operation on each instruction in the instruction sequence according to the length of the instruction sequence to acquire the sequence of each instruction in the instruction sequence obtained through each cyclic shift operation;
calculating correlation coefficients between the single photon counting sequence detected at each delay position of the single photon detector and the instruction sequence obtained through each cyclic shift operation;
acquiring a delay position of the single photon detector corresponding to the maximum value in the calculated correlation coefficient and sequencing of each instruction in the instruction sequence;
locking the delay position of the single photon detector and the ordering of the individual instructions in the instruction sequence to the acquired delay position of the single photon detector and the acquired ordering in the instruction sequence respectively,
wherein the light source is included in a transmitting end of the quantum communication system and the single photon detector is included in a receiving end of the quantum communication system.
2. The method of claim 1, wherein the quantum communication system is encoded based on at least one of polarization encoding, time encoding, phase encoding, and time phase encoding.
3. The method of claim 1, wherein each instruction in the sequence of instructions comprises light emitting information or no light emitting information.
4. The method of claim 1, wherein the cyclic shift operation comprises at least one of a cyclic left shift operation and a cyclic right shift operation.
5. The method of claim 1, wherein performing a cyclic shift operation on each instruction in the sequence of instructions according to the length of the sequence of instructions comprises:
determining the number of times of performing circular left shift operation on each instruction in the instruction sequence according to the length of the instruction sequence, and circularly shifting one bit leftwards each time, wherein the instruction of the forefront one bit in the instruction sequence is shifted to the rearmost one bit in the instruction sequence, and other instructions except the instruction of the forefront one bit in the instruction sequence are respectively shifted forwards by one bit.
6. The method of claim 1, wherein performing a cyclic shift operation on each instruction in the sequence of instructions according to the length of the sequence of instructions comprises:
determining the times of performing circular right shift operation on each instruction in the instruction sequence according to the length of the instruction sequence, and circularly shifting one bit to the right each time, wherein the instruction in the rearmost bit in the instruction sequence is shifted to the foremost bit in the instruction sequence, and other instructions except the instruction in the rearmost bit in the instruction sequence are respectively shifted backwards by one bit.
7. The method of claim 1, wherein the length of the sequence of instructions is the same as the length of the sequence of single photon counts.
8. The method of claim 1, wherein execution of each instruction in the sequence of instructions and acquisition of each single photon count in the sequence of single photon counts is synchronized with a coding clock of the quantum communication system.
9. An optimizing apparatus for a quantum communication system, comprising:
a light pulse output control unit configured to repeatedly execute a sequence of instructions for controlling the light source to output light pulses;
a photon counting acquisition unit configured to change delay positions of a single photon detector for receiving light pulses by a predetermined step length to acquire a single photon counting sequence detected at each delay position of the single photon detector;
a cyclic shift operation unit configured to perform cyclic shift operation on ordering positions of respective instructions in the instruction sequence according to a length of the instruction sequence, so as to obtain ordering of the respective instructions in the instruction sequence obtained via each cyclic shift operation;
a correlation coefficient calculation unit configured to calculate a correlation coefficient between a single photon count sequence detected at each delay position of the single photon detector and the instruction sequence obtained via each cyclic shift operation;
a correlation coefficient optimizing unit configured to acquire a delay position of the single photon detector corresponding to a maximum value in the calculated correlation coefficient and an order of respective instructions in the instruction sequence;
a system position locking unit configured to lock the delay position of the single photon detector and the ordering of the individual instructions in the instruction sequence to the acquired delay position of the single photon detector and the acquired ordering in the instruction sequence, respectively,
wherein the light source is included in a transmitting end of the quantum communication system and the single photon detector is included in a receiving end of the quantum communication system.
10. The apparatus of claim 9, wherein the quantum communication system is encoded based on at least one of polarization encoding, time encoding, phase encoding, and time phase encoding.
11. The apparatus of claim 9, wherein each instruction in the sequence of instructions comprises light emitting information or non-light emitting information.
12. The apparatus of claim 9, wherein the cyclic shift operation comprises at least one of a cyclic left shift operation and a cyclic right shift operation.
13. The apparatus of claim 9, wherein the cyclic shift operation unit is further configured to:
determining the number of times of performing circular left shift operation on each instruction in the instruction sequence according to the length of the instruction sequence, and circularly shifting one bit leftwards each time, wherein the instruction of the forefront one bit in the instruction sequence is shifted to the rearmost one bit in the instruction sequence, and other instructions except the instruction of the forefront one bit in the instruction sequence are respectively shifted forwards by one bit.
14. The apparatus of claim 9, wherein the cyclic shift operation unit is further configured to:
determining the times of performing circular right shift operation on each instruction in the instruction sequence according to the length of the instruction sequence, and circularly shifting one bit to the right each time, wherein the instruction in the rearmost bit in the instruction sequence is shifted to the foremost bit in the instruction sequence, and other instructions except the instruction in the rearmost bit in the instruction sequence are respectively shifted backwards by one bit.
15. The apparatus of claim 9, wherein the sequence of instructions has a length that is the same as a length of the single photon counting sequence.
16. The apparatus of claim 9, wherein execution of each instruction in the sequence of instructions and acquisition of each single photon count in the sequence of single photon counts is synchronized with a coding clock of the quantum communication system.
17. A computer readable storage medium storing a computer program, characterized in that the optimizing method for a quantum communication system according to any one of claims 1 to 8 is implemented when the computer program is executed by a processor.
18. A computing device, comprising:
a processor;
a memory storing a computer program which, when executed by a processor, implements the optimizing method for a quantum communication system of any one of claims 1 to 8.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202310324438.4A CN116192278B (en) | 2023-03-30 | 2023-03-30 | Optimizing method, device, medium and equipment for quantum communication system |
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| CN202310324438.4A CN116192278B (en) | 2023-03-30 | 2023-03-30 | Optimizing method, device, medium and equipment for quantum communication system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108737074A (en) * | 2017-04-13 | 2018-11-02 | 科大国盾量子技术股份有限公司 | A kind of information synchronization method and device |
| WO2020140851A1 (en) * | 2018-12-30 | 2020-07-09 | 华南师范大学 | Quantum communication and quantum time-frequency transmission fusion network system and method |
| CN111896127A (en) * | 2020-08-03 | 2020-11-06 | 四川九洲电器集团有限责任公司 | Time-delay multichannel photon counting receiving method and system based on single photon detector |
| CN115001596A (en) * | 2022-08-05 | 2022-09-02 | 国开启科量子技术(北京)有限公司 | Gating signal tuning method and device for quantum communication system |
| CN115442041A (en) * | 2022-11-08 | 2022-12-06 | 国开启科量子技术(北京)有限公司 | Method, apparatus, medium, and device for optimizing light source based on interference contrast |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108737074A (en) * | 2017-04-13 | 2018-11-02 | 科大国盾量子技术股份有限公司 | A kind of information synchronization method and device |
| WO2020140851A1 (en) * | 2018-12-30 | 2020-07-09 | 华南师范大学 | Quantum communication and quantum time-frequency transmission fusion network system and method |
| CN111896127A (en) * | 2020-08-03 | 2020-11-06 | 四川九洲电器集团有限责任公司 | Time-delay multichannel photon counting receiving method and system based on single photon detector |
| CN115001596A (en) * | 2022-08-05 | 2022-09-02 | 国开启科量子技术(北京)有限公司 | Gating signal tuning method and device for quantum communication system |
| CN115442041A (en) * | 2022-11-08 | 2022-12-06 | 国开启科量子技术(北京)有限公司 | Method, apparatus, medium, and device for optimizing light source based on interference contrast |
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