CN116192320A - Quantum time synchronous control method for wavelength division multiplexing - Google Patents
Quantum time synchronous control method for wavelength division multiplexing Download PDFInfo
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Abstract
According to the quantum time synchronization control method for the wavelength division multiplexing, the real-time clock difference of the time reference between any two points of the distributed sensing system is measured through the quantum time synchronization system, clock difference fluctuation among all the points of the distributed sensing system is realized through the wavelength division multiplexing quantum entanglement distribution system, and the delay line of the distributed sensing system is controlled according to the clock difference calculation result, so that time synchronization is always kept among all sensing units, and full play of system superposition efficiency is realized. The project is used as a cooperative means to provide a time synchronization mechanism for a distributed sensing system such as combined spectral imaging and the like, and is expected to be widely applied to the fields of weather early warning, hydrologic monitoring, marine surveying and mapping, electric power monitoring and the like.
Description
Technical Field
The invention belongs to the interdisciplines of quantum measurement, quantum communication and signal processing, in particular to a method for measuring clock differences of a plurality of points by utilizing a wavelength division multiplexing quantum entanglement distribution system, completing time synchronization of the plurality of points by active control and realizing zero-reset control of the clock differences of a distributed measurement system, and particularly relates to a quantum time synchronization control method of wavelength division multiplexing.
Background
The core of coherent accumulation is to improve the signal to noise ratio by pulse accumulation according to the phase relation of adjacent pulse signals. The coherent accumulation technology can improve the performance of a distributed sensing system (or called a measurement network), so that various measurement devices distributed and distributed keep high coordination, and the performance can be greatly improved whether the combined measurement of the same target or the separate measurement of different targets is carried out. For application fields such as combined target measurement, the time reference between each measurement unit needs to reach high consistency, and the higher the time synchronization degree is, the closer the superposition effect of the measurement distance or the measurement precision is to an ideal value.
The quantum time synchronization means that time calibration is provided for different users through quantum signals, and the quantum time synchronization device has the characteristics of high reliability, high precision, high safety and the like, wherein the high reliability is represented by the fact that quantum time synchronization based on single photons naturally has strong electromagnetic interference resistance and still has time synchronization capability under the condition of electromagnetic compression; the high precision is reflected in that the quantum time synchronization is closer to the precision limit of the Hessenberg than the classical time synchronization; high security is presented in that quantum signal transmission also belongs to the field of quantum communication, i.e. also has the ability to combat channel attacks. The final output result of the quantum time synchronization system at the present stage is clock difference signals of each point, and if the clock difference signals are used as input variables to control each distributed sensing system to keep the time scale height consistent, the distributed sensing system can fully exert the system superposition effect.
Disclosure of Invention
Aiming at the defects, the technical problem to be solved by the invention is how to distribute entangled photons for any two nodes of the distributed sensing system by utilizing the wavelength division multiplexing quantum entanglement distribution system, and the high-precision real-time synchronization among all the points of the distributed sensing system is realized by utilizing the quantum time synchronization system based on the entangled photons to measure the relative clock difference among all the points of the distributed sensing system and controlling through a delay line.
The invention aims to provide a quantum time synchronization control method of wavelength division multiplexing, which utilizes a bidirectional transmission quantum time synchronization protocol based on entanglement to realize clock difference calculation between any two points of a distributed sensing system, utilizes the wavelength division multiplexing system to realize clock difference calculation between a certain point position and all other point positions of the distributed sensing system, and controls a tunable delay line according to clock difference fluctuation condition until the clock difference of all point position time references in the distributed sensing system is controlled within quantum time synchronization precision errors.
Preferably, the distributed sensing system comprises A, B, C three spots, each of which is provided with a multi-wavelength entangled light source capable of distributing entangled photons of two different wavelengths.
Preferably, the multi-wavelength entangled light source of the point a generates two pairs of entangled photons, one entangled photon from the two pairs of entangled photons is input to the local single photon detector, and the other entangled photon is output to the wavelength division multiplexing system through the circulator and is input to the single photon detectors of the point B and the point C respectively through the wavelength division multiplexing system.
Preferably, after the clock differences between a and B, A and C are obtained at the point a, the tunable delay line is controlled to slightly delay the clock signal output by the micro atomic clock until any one of the clock differences between a and B or between a and C is corrected to an indistinguishable zero value.
Preferably, the tunable delay line control is performed at point B until the remaining clock skew is also corrected to an indistinguishable zero value, at which point the time between the three distributed sensing system points A, B, C is synchronized.
Preferably, the method specifically comprises the following steps:
s1, constructing a wavelength division multiplexing quantum time synchronization network, realizing point-to-point clock error measurement by using an entangled-based bidirectional transmission quantum time synchronization protocol or other quantum time synchronization protocols, and realizing multi-node clock error measurement by using a wavelength division multiplexing system;
s2, setting a tunable delay line at the output end of each node high-performance clock, precisely controlling the optical delay of the tunable delay line according to clock difference data obtained by the measurement of the coincidence counter, and forming a negative feedback mechanism of clock difference measurement-control signal-optical delay-clock difference measurement until the clock difference between each point bit is controlled to be zero value of the limit precision of the quantum time synchronization system;
s3, controlling signal coordination among the distributed sensing systems by taking the quantum time synchronous control network of the wavelength division multiplexing as a time reference, so that the sensing performance of the distributed sensing systems can reach the enhancement of the system efficiency according to a near ideal state.
Preferably, in the step S1, a quantum time synchronization network is built by a multi-wavelength entangled light source, a wavelength division multiplexing system, an optical interferometer, a single photon detector, a coincidence counter, an optical circulator and a high-performance clock.
Preferably, the above-mentioned quantum synchronization compiles the time synchronization signal to the quantum state, realize the clock synchronization through the fidelity lossless transmission of the quantum state, the two sides of time synchronization need to be equipped with the high accurate clock and regard this clock as the reference clock of the quantum communication.
Preferably, the method includes a plurality of sensing nodes, each sensing node can independently measure a certain physical quantity, and the sensing performance can be improved through the information cooperation of the two sensing nodes.
The present invention provides a computer readable storage medium having stored thereon a computer program which when executed by a processor implements the above method.
Compared with the prior art, the invention has the following advantages:
firstly, the invention provides a quantum time synchronization network method based on wavelength division multiplexing, which can convert the traditional point-to-point quantum time synchronization into networking quantum time synchronization and provide important reference for a quantum time service system;
secondly, the tunable delay line control technology provided by the invention is a technology for realizing time synchronization at a physical level, and changes the method of simply solving clock error of the traditional quantum time synchronization system;
finally, the invention provides a design idea of applying the quantum time synchronization network and the control system to the distributed sensing system, so that various distributed information systems such as combined spectrum imaging and the like can be ensured to fully exert the networking synergistic effect.
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In order to more clearly illustrate the technical solution of the embodiments of the present invention, the drawings that are needed to be used in the embodiments of the present invention will be briefly described, and other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of an embodiment of a method for controlling quantum-time synchronization of wavelength division multiplexing according to the present invention;
FIG. 2 shows a schematic diagram of a particular embodiment of a quantum time synchronization control network of the wavelength division multiplexing of the present invention;
fig. 3 shows a schematic diagram of another embodiment of the quantum-time synchronization control method of wavelength division multiplexing according to the present invention.
Detailed Description
Features and exemplary embodiments of various aspects of the present invention will be described in detail below, and in order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are merely configured to illustrate the invention and are not configured to limit the invention. It will be apparent to one skilled in the art that the present invention may be practiced without some of these specific details. The following description of the embodiments is merely intended to provide a better understanding of the invention by showing examples of the invention.
It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising … …" does not exclude the presence of other like elements in a process, method, article or apparatus that comprises the element.
As shown in fig. 1, the present invention provides an embodiment of a quantum time synchronization control method of wavelength division multiplexing, including:
s101, performing point-to-point quantum time synchronous measurement, and realizing clock difference calculation between any two points of a distributed sensing system by using a bidirectional transmission quantum time synchronous protocol based on entanglement;
s102, synchronously measuring networked quantum time, and calculating clock differences between a certain point position and all other point positions of the distributed sensing system by utilizing a wavelength division multiplexing system;
and S103, realizing quantum time synchronization control, and controlling the tunable delay line according to the fluctuation condition of the clock difference until the clock difference of all point location time references in the distributed sensing system is controlled within the quantum time synchronization precision error.
In some embodiments, the distributed sensing system includes a plurality of sensing nodes, each sensing node is capable of independently measuring a certain physical quantity, and sensing performance can be improved through information cooperation of two sensing nodes.
In some preferred embodiments, the distributed sensing system comprises A, B, C three spots, each spot deploying a multi-wavelength entangled light source capable of distributing entangled photons of two different wavelengths.
In some embodiments, the multi-wavelength entangled light source of the point a generates two pairs of entangled photons, one entangled photon from each of the two pairs of entangled photons is input to the local single-photon detector, and the other entangled photon is output to the wavelength division multiplexing system through the circulator and is input to the single-photon detectors of the point B and the point C respectively through the wavelength division multiplexing system.
In some embodiments, after the clock differences between a and B, A and C are obtained at the point a, the tunable delay line is controlled to slightly delay the clock signal output by the micro atomic clock until any one of the clock differences between a and B or between a and C is corrected to an indistinguishable zero value.
In some embodiments, the tunable delay line control is performed at point B until the remaining clock skew is also corrected to an indistinguishable zero value, at which point the time between the three distributed sensing system points A, B, C is synchronized.
As shown in fig. 2, the embodiment further provides a quantum time synchronization control network for wavelength division multiplexing, which includes the following implementation steps:
1. the distributed sensing system comprises A, B, C three points, wherein each point is provided with a multi-wavelength entangled light source, and the entangled light sources can distribute entangled photons with two pairs of different wavelengths;
2. the multi-wavelength entangled light source of the point A generates two pairs of entangled photons, one entangled photon is selected from the two pairs of entangled photons and input into a local single photon detector, the other entangled photon is output into a wavelength division multiplexing system through a circulator, and the other entangled photon is respectively input into the single photon detectors of the points B and C through the wavelength division multiplexing system;
3. taking a local micro atomic clock as a time reference, carrying out coincidence measurement through a time interval counter, and obtaining the clock difference between A and B, A and C, wherein when the dot number of the distributed sensing system is N, the needed multi-wavelength entangled light source needs to provide N-1 pairs of entangled photons;
4. after the clock differences of A and B, A and C are obtained at the A position, the tunable delay line is controlled to slightly delay the clock signals output by the micro atomic clock until any one group of clock differences of A and B or A and C is corrected to a zero value which cannot be distinguished;
5. the tunable delay line control is performed at B until the remaining clock difference is also corrected to an indistinguishable zero value, at which point the time between the three distributed sensing system points A, B, C is synchronized (indistinguishable zero value means that there is some clock difference but the clock difference cannot be resolved by the quantum time synchronization system).
As shown in fig. 3, this embodiment shows an embodiment of a quantum time synchronization control method of wavelength division multiplexing, which specifically includes:
s201, constructing a wavelength division multiplexing quantum time synchronization network, constructing the quantum time synchronization network through a multi-wavelength entangled light source, a wavelength division multiplexing system, an optical interferometer, a single photon detector, a coincidence counter, an optical circulator, a high-performance clock and other devices, realizing point-to-point clock difference measurement by using an entangled bidirectional transmission quantum time synchronization protocol or other quantum time synchronization protocols, and realizing multi-node clock difference measurement by using the wavelength division multiplexing system;
s202, setting a tunable delay line at the output end of each node high-performance clock, precisely controlling the optical delay of the tunable delay line according to clock difference data obtained by the measurement of the coincidence counter, and forming a negative feedback mechanism of clock difference measurement-control signal-optical delay-clock difference measurement until the clock difference between each point bit is controlled to be zero value of the limit precision of the quantum time synchronization system;
s203, using a quantum time synchronous control network of wavelength division multiplexing as a time reference, controlling signal coordination among distributed sensing systems, so that the sensing performance of the distributed sensing systems can reach a system efficiency enhancement effect according to a near-ideal state, for example, the joint spectrum measurement distance is close to a theoretical calculated 3dB gain.
The invention also provides an embodiment of a quantum time synchronization control method of the wavelength division multiplexing, which measures the real-time clock difference of the time reference between any two points of the distributed sensing system through the quantum time synchronization system, realizes clock difference fluctuation among all the points of the distributed sensing system through the wavelength division multiplexing quantum entanglement distribution system, controls the delay line of the distributed sensing system according to the clock difference calculation result, always keeps time synchronization among all the sensing units, and realizes full play of the superposition efficiency of the system.
In some embodiments, the quantum time synchronization is to compile a time synchronization signal onto a quantum state, realize clock synchronization through quantum state fidelity lossless transmission, and the two time synchronization sides need to be provided with high-precision clocks and use the clock as a reference clock for quantum communication; the quantum time synchronization has higher precision than classical time synchronization, the clock synchronization signal can be compatible with the security of quantum communication, and the quantum time synchronization taking light quanta as a carrier has the electromagnetic interference resistance.
In some embodiments, the specific scheme and parameter indicators of quantum time synchronization are not limited, and the specific implementation and standard protocols of the quantum time synchronization system are not limited.
In some embodiments, the time synchronization control is to set a tunable delay line at the output end of the high-performance clock of each node, precisely control the optical delay of the tunable delay line according to the clock difference data obtained by the coincidence counter measurement, form a negative feedback mechanism of clock difference measurement-control signal-optical delay-clock difference measurement until the clock difference between each point bit is controlled to be zero value of the limit precision of the quantum time synchronization system, and not limit the optical structure of the tunable delay line and not limit the data flow of the negative feedback.
In some embodiments, the distributed sensing includes a plurality of sensing nodes, each sensing node can independently measure a certain physical quantity, the sensing performance can be improved through the information cooperation of two sensing nodes, the physical quantity measured by the sensing nodes can be an electric field, a magnetic field, a temperature, a gravity field, an optical field, an electromagnetic field echo and the like, the sensing performance improvement includes but is not limited to precision improvement, object identification capability improvement, measurement distance improvement, signal-to-noise ratio improvement and anti-interference capability improvement, and all the technologies of realizing signal precision control through multi-point high-precision time synchronization and enabling the distributed sensing performance to be better than single-point sensing performance are within the scope of the claims of the invention.
Compared with the prior art, the invention has the following advantages:
firstly, the invention provides a quantum time synchronization network method based on wavelength division multiplexing, which can convert the traditional point-to-point quantum time synchronization into networking quantum time synchronization and provide important reference for a quantum time service system;
secondly, the tunable delay line control technology provided by the invention is a technology for realizing time synchronization at a physical level, and changes the method of simply solving clock error of the traditional quantum time synchronization system;
finally, the invention provides a design idea of applying the quantum time synchronization network and the control system to the distributed sensing system, so that various distributed information systems such as combined spectrum imaging and the like can be ensured to fully exert the networking synergistic effect.
For convenience of description, the above devices are described as being functionally divided into various units, respectively. Of course, the functions of each element may be implemented in one or more software and/or hardware elements when implemented in the present application.
It will be appreciated by those skilled in the art that embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
The application may be described in the general context of computer-executable instructions, such as program modules, being executed by a computer. Generally, program modules include routines, programs, objects, components, data structures, etc. that perform particular tasks or implement particular abstract data types. The application may also be practiced in distributed computing environments where tasks are performed by remote processing devices that are linked through a communications network. In a distributed computing environment, program modules may be located in both local and remote computer storage media including memory storage devices.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
In one typical configuration, a computing device includes one or more processors (CPUs), input/output interfaces, network interfaces, and memory.
The memory may include volatile memory in a computer-readable medium, random Access Memory (RAM) and/or nonvolatile memory, such as Read Only Memory (ROM) or flash memory (flash RAM). Memory is an example of computer-readable media.
Computer readable media, including both non-transitory and non-transitory, removable and non-removable media, may implement information storage by any method or technology. The information may be computer readable instructions, data structures, modules of a program, or other data. Examples of storage media for a computer include, but are not limited to, phase change memory (PRAM), static Random Access Memory (SRAM), dynamic Random Access Memory (DRAM), other types of Random Access Memory (RAM), read Only Memory (ROM), electrically Erasable Programmable Read Only Memory (EEPROM), flash memory or other memory technology, compact disc read only memory (CD-ROM), digital Versatile Discs (DVD) or other optical storage, magnetic cassettes, magnetic tape magnetic disk storage or other magnetic storage devices, or any other non-transmission medium, which can be used to store information that can be accessed by a computing device. Computer-readable media, as defined herein, does not include transitory computer-readable media (transmission media), such as modulated data signals and carrier waves.
It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article or apparatus that comprises the element.
In this specification, each embodiment is described in a progressive manner, and identical and similar parts of each embodiment are all referred to each other, and each embodiment mainly describes differences from other embodiments. In particular, for system embodiments, since they are substantially similar to method embodiments, the description is relatively simple, as relevant to see a section of the description of method embodiments.
The foregoing is merely exemplary of the present application and is not intended to limit the present application. Various modifications and changes may be made to the present application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc. which are within the spirit and principles of the present application are intended to be included within the scope of the claims of the present application.
Claims (10)
1. The quantum time synchronous control method of the wavelength division multiplexing is characterized in that clock difference resolving between any two points of a distributed sensing system is achieved by utilizing a bidirectional transmission quantum time synchronous protocol based on entanglement, clock difference resolving between a certain point position and all other point positions of the distributed sensing system is achieved by utilizing the wavelength division multiplexing system, and a tunable delay line is controlled according to clock difference fluctuation conditions until clock differences of time references of all point positions in the distributed sensing system are controlled within quantum time synchronous precision errors.
2. The method of quantum-time synchronous control of wavelength division multiplexing of claim 1, wherein the distributed sensing system comprises A, B, C three spots, each spot being configured with a multi-wavelength entangled light source capable of distributing entangled photons of two different pairs of wavelengths.
3. The quantum time synchronization control method of wavelength division multiplexing according to claim 2, wherein the multi-wavelength entangled light source of the a point location generates two pairs of entangled photons, one entangled photon from the two pairs of entangled photons is input to a local single photon detector, the other entangled photon is output to the wavelength division multiplexing system through a circulator, and the entangled photon is input to the single photon detectors of the B point location and the C point location respectively through the wavelength division multiplexing system.
4. The method for quantum time synchronization control of wavelength division multiplexing according to claim 2, wherein after the clock differences between a and B, A and C are obtained at the point a, the tunable delay line is controlled to slightly delay the clock signal output by the micro atomic clock until any one of the clock differences between a and B or between a and C is corrected to a zero value which cannot be distinguished.
5. The quantum-time synchronous control method of wavelength division multiplexing according to claim 2, wherein the tunable delay line control is performed at point B until the remaining clock difference is corrected to an indistinguishable zero value, at which time the time between the three distributed sensing system points A, B, C is synchronized.
6. The quantum time synchronization control method of wavelength division multiplexing according to claim 1, wherein the method specifically comprises the steps of:
s1, constructing a wavelength division multiplexing quantum time synchronization network, realizing point-to-point clock error measurement by using an entangled-based bidirectional transmission quantum time synchronization protocol or other quantum time synchronization protocols, and realizing multi-node clock error measurement by using a wavelength division multiplexing system;
s2, setting a tunable delay line at the output end of each node high-performance clock, precisely controlling the optical delay of the tunable delay line according to clock difference data obtained by the measurement of the coincidence counter, and forming a negative feedback mechanism of clock difference measurement-control signal-optical delay-clock difference measurement until the clock difference between each point bit is controlled to be zero value of the limit precision of the quantum time synchronization system;
s3, controlling signal coordination among the distributed sensing systems by taking the quantum time synchronous control network of the wavelength division multiplexing as a time reference, so that the sensing performance of the distributed sensing systems can reach the enhancement of the system efficiency according to a near ideal state.
7. The method for quantum-time synchronization control of wavelength division multiplexing according to claim 6, wherein the quantum-time synchronization network is built up in S1 by a multi-wavelength entangled light source, a wavelength division multiplexing system, an optical interferometer, a single photon detector, a coincidence counter, an optical circulator, and a high-performance clock.
8. The method for quantum time synchronization control of wavelength division multiplexing according to claim 6, wherein the quantum synchronization compiles a time synchronization signal into a quantum state, realizes clock synchronization by quantum state fidelity lossless transmission, and the two time synchronization sides need to be provided with a high-precision clock and use the clock as a reference clock for quantum communication.
9. The quantum time synchronization control method of wavelength division multiplexing according to claim 1, wherein the method comprises a plurality of sensing nodes, each sensing node can independently measure a certain physical quantity, and sensing performance can be improved by information cooperation of two sensing nodes.
10. A computer readable storage medium having stored thereon a computer program which when executed by a processor performs the method of any of claims 1-9.
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| CN117250161A (en) * | 2023-11-17 | 2023-12-19 | 黑龙江省农业科学院黑河分院 | Real-time monitoring system of soybean salt and alkali tolerance identification pond |
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