CN113472451A - Quantum time synchronization method for mechanical-solid interconnection - Google Patents
Quantum time synchronization method for mechanical-solid interconnection Download PDFInfo
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Abstract
The invention discloses a quantum time synchronization method for mechanical-solid interconnection, which is characterized in that a mechanical-solid interconnection quantum communication link is established through a precise tracking system, a self-adaptive optical compensation system, a wavelength conversion system and the like, the mechanical-solid interconnection quantum time synchronization is realized through a quantum light source, a high-precision clock, a time interval counter and the like, and a brand new technical means is provided for wide-area high-precision high-safety time synchronization under the rejection conditions of electromagnetic pressing and the like. The invention effectively combines the quantum communication technology and the quantum time synchronization technology, replaces the radio communication channel with the wireless optical communication channel, realizes the comprehensive coverage of quantum time synchronization through the fixed interconnection link of the full quantum machine, can expand the quantum communication service scope and promote the landing application of the quantum internet, and is expected to provide a solution for the development of the next generation time service navigation positioning system.
Description
Technical Field
The invention belongs to the interdisciplinary field of quantum detection, quantum communication, clock synchronization, optical fiber communication and wireless optical communication, in particular to a method for establishing a mechanical-solid interconnection quantum communication link, safely and reliably transmitting a quantum clock signal through a quantum communication system and realizing high-precision quantum time synchronization in a wide area range, and particularly relates to a mechanical-solid interconnection quantum time synchronization method, a mechanical-solid interconnection quantum time synchronization system and a storage medium.
Background
The quantum is the smallest inseparable unit of energy, meets the Heisenberg inaccuracy measuring principle and the quantum unclonable principle, cannot accurately obtain all state information of an unknown quantum before measurement, and cannot accurately copy all state information of a measured quantum in a full-dimensional manner. The quantum communication technology using flight quantum (such as single photon) as carrier transmission can resist various channel attack means such as amplitude-division eavesdropping, receiving-retransmitting and the like, and has theoretically unconditional safety. Quantum communication comprises a plurality of technical branches, narrow quantum communication mainly refers to the transmission of plaintext information by using quantum, including quantum key distribution, quantum direct communication and the like, and quantum communication in a broad sense mainly refers to the transmission of quantum states, and typical applications include distributed quantum sensing, distributed quantum computation, high-precision quantum time synchronization and the like.
The quantum time synchronization is characterized in that time calibration is provided for users in different places through quantum signals, and the quantum time synchronization has the characteristics of high reliability, high precision, high safety and the like, wherein the high reliability is realized in that the quantum time synchronization based on single photons naturally has strong electromagnetic interference resistance and still has time synchronization capability under the condition of electromagnetic pressing; the high precision is embodied in that the quantum time synchronization is closer to the Heisenberg precision limit than the classical time synchronization; the high security is realized in the way that quantum signal transmission also belongs to the quantum communication category, namely, the capability of resisting channel attack is also provided. However, quantum time synchronization at present mainly faces to fixed network optical cables, time synchronization in a mobile environment still depends on radio signals, and a feasible means capable of communicating time synchronization of a mobile platform and time synchronization of a fixed platform is lacked.
Disclosure of Invention
Based on the problems of the prior art, the technical problems to be solved by the invention are as follows: how to realize wide-area high-precision high-safety time synchronization under the rejection conditions such as electromagnetic pressing.
Aiming at the defects in the prior art, the invention aims to provide a quantum time synchronization method for mechanical-solid interconnection, which integrates a quantum communication technology and a laser time synchronization technology, establishes a quantum communication link for mechanical-solid interconnection through a precise tracking system, a self-adaptive optical compensation system, a wavelength conversion system and the like, establishes a quantum time synchronization system through a quantum light source, a high-precision clock, a time interval counter and the like, realizes a quantum time synchronization function by utilizing the quantum communication link for mechanical-solid interconnection, and provides a brand new technical means for wide-area high-precision high-safety time synchronization under rejection conditions such as electromagnetic pressing and the like.
In order to achieve the above effect, the quantum time synchronization method of mechanical-solid interconnection provided by the invention comprises the following steps:
establishing a machine-fixed interconnection quantum communication link, establishing a fixed all-optical link and a maneuvering all-optical link, and connecting the machine-fixed interconnection quantum communication link through a wavelength conversion system;
constructing a quantum time synchronization end system, generating a quantum clock signal through a quantum light source, analyzing the arrival time of the quantum clock signal by using a time interval counter and correcting a local high-precision clock, and realizing the anti-interception high-precision quantum time synchronization of the clock signal;
and step three, synchronizing the mechanical-solid interconnection quantum time, constructing an air, space, ground and sea integrated mechanical-solid interconnection quantum communication link, and realizing multi-domain support and wide area coverage networking quantum time synchronization.
Preferably, in the first step, a fixed all-optical link is constructed through an optical fiber, and a mobile all-optical link is constructed through a precise tracking system and a self-adaptive compensation optical system.
Preferably, the third step is implemented by passing through an air, space, ground and sea integrated mechanical-solid interconnection quantum communication link, and time reference correction is carried out on all nodes directly connected with a quantum channel, so that quantum time synchronization capabilities of various working environments, global coverage, ultra-classical accuracy limit, electromagnetic interference resistance, interception and forgery resistance and large-scale networked distribution are formed.
Preferably, the optical fiber channel operating band is a lowest loss band of the communication optical fiber near 1550 nm.
Preferably, the operating band of the free space optical channel is an atmospheric transmission window near 808nm or a 1550+ nm long wave band resistant to solar background light interference.
Preferably, the working waveband of the underwater optical channel is blue-green light, and the low-loss communication among the free space optical channel, the underwater optical channel and the optical fiber channel is realized through the wavelength conversion system.
Preferably, the machine-fixed interconnection link is oriented to an all-optical link established by quantum communication, fixed targets are directly connected through a relay-free non-amplification low-loss optical fiber, free-space maneuvering targets are stably connected through channels and low-loss transmission of all-optical signals through an accurate tracking and aiming system and a self-adaptive compensation system by taking the atmosphere as a transmission medium; water is used as a transmission medium between underwater maneuvering targets, and stable connection of channels and low-loss transmission of all-optical signals are realized through a precise tracking and aiming system and a self-adaptive compensation system.
Preferably, the quantum time synchronization compiles a time synchronization signal into a quantum state, and clock synchronization is realized through quantum state fidelity lossless transmission, and both time synchronization parties need to be provided with a high-precision clock and use the clock as a reference clock for quantum communication.
A system for realizing the quantum time synchronization method of machine-fixed interconnection comprises an optical fiber, a precise tracking system, an adaptive optical compensation system, a wavelength conversion system, a quantum light source, a time interval counter, a fixed all-optical link constructed by the optical fiber, a maneuvering all-optical link constructed by the precise tracking system and the adaptive compensation optical system, a machine-fixed interconnection quantum communication link started by the wavelength conversion system, an entangled photon generated by a quantum entangled light source and transmitted by the quantum communication link, a single photon detector for detecting each path of photon and a time interval counter for analyzing the arrival time of a quantum clock signal, respective high-precision clocks of two communication parties are compared, and clock difference is used as reference calibration time; all the nodes directly connected with the quantum channel are subjected to time reference correction through the air, space, ground and sea integrated mechanical-solid interconnection quantum communication link, and the quantum time synchronization capacity of various working environments, global coverage, super-classical accuracy limit, electromagnetic interference resistance, interception and forgery resistance and large-scale networked distribution is formed.
A computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the above-mentioned method.
A computer program product comprising computer programs/instructions which, when executed by a processor, implement the steps of the above-described method.
The time division multiplexing centralized detection strategy provided by the invention avoids the cost and energy consumption risk of large-scale deployment of single photon detectors, and provides an important solution for quantum internet construction and quantum information technology integration.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the embodiments of the present invention will be briefly described below, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic diagram illustrating the quantum time synchronization method of the present invention for mechanical interconnect;
FIG. 2 illustrates a diagram of the present invention mechanical-solid interconnect quantum communication link;
fig. 3 shows a schematic diagram of the bidirectional quantum time synchronization system based on the entanglement light source.
Detailed Description
Features and exemplary embodiments of various aspects of the present invention will be described in detail below, and in order to make objects, technical solutions and advantages of the present invention more apparent, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not to be construed as limiting 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 present invention by illustrating examples of the present invention.
It is noted that, herein, relational terms such as first and second, and the like may be 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. Also, 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 identical elements in a process, method, article, or apparatus that comprises the element.
The invention provides an embodiment of a quantum time synchronization method of mechanical-solid interconnection, which comprises the following steps of establishing a quantum communication link of mechanical-solid interconnection, establishing a fixed all-optical link and a maneuvering all-optical link, and switching on the quantum communication link of mechanical-solid interconnection through a wavelength conversion system;
constructing a quantum time synchronization end system, generating a quantum clock signal through a quantum light source, analyzing the arrival time of the quantum clock signal by using a time interval counter and correcting a local high-precision clock, and realizing the anti-interception high-precision quantum time synchronization of the clock signal;
and step three, synchronizing the mechanical-solid interconnection quantum time, constructing an air, space, ground and sea integrated mechanical-solid interconnection quantum communication link, and realizing multi-domain support and wide area coverage networking quantum time synchronization.
In some embodiments, step one is to construct a fixed all-optical link through optical fibers, and step one is to construct a mobile all-optical link through a precise tracking system and an adaptive compensation optical system.
In some embodiments, the third step is performed through an air, space, ground and sea integrated mechanical-solid interconnection quantum communication link, and time reference correction is performed on all nodes directly connected with a quantum channel, so that quantum time synchronization capabilities of various working environments, global coverage, super-classical accuracy limit, electromagnetic interference resistance, interception and forgery resistance and large-scale networked distribution are formed.
In some embodiments, the optical fiber channel operating band is the lowest loss band of the optical communication fiber near 1550 nm.
In some embodiments, the free-space optical channel operating band is an atmospheric transmission window around 808nm, or a 1550+ nm long wavelength band that is resistant to interference from solar background light.
In some embodiments, the operating band of the underwater optical channel is blue-green light, and low-loss communication among the free-space optical channel, the underwater optical channel and the optical fiber channel is realized through the wavelength conversion system.
In some embodiments, the mechanical-solid interconnection link faces an all-optical link established by quantum communication, fixed targets are directly connected through a relay-free non-amplification low-loss optical fiber, and free-space maneuvering targets are stably connected through channels and low-loss transmission of all-optical signals through an accurate tracking and aiming system and an adaptive compensation system by taking the atmosphere as a transmission medium; water is used as a transmission medium between underwater maneuvering targets, and stable connection of channels and low-loss transmission of all-optical signals are realized through a precise tracking and aiming system and a self-adaptive compensation system.
In some embodiments, quantum time synchronization compiles a time synchronization signal onto a quantum state, clock synchronization is achieved through quantum state fidelity lossless transmission, and both time synchronization parties need to be equipped with a high-precision clock and use the clock as a reference clock for quantum communication.
The invention provides a system embodiment of a quantum time synchronization method for realizing machine-fixed interconnection, which comprises an optical fiber, an accurate tracking system, an adaptive optical compensation system, a wavelength conversion system, a quantum light source, a time interval counter, a fixed all-optical link constructed by the optical fiber, a mobile all-optical link constructed by the accurate tracking system and the adaptive compensation optical system, a machine-fixed interconnection quantum communication link switched on by the wavelength conversion system, an entangled photon generated by the quantum entangled light source and transmitted by the quantum communication link, a single photon detector for detecting each path of photon and a time interval counter for analyzing the arrival time of a quantum clock signal, and high-precision clocks of two communication parties are compared and the clock difference is used as the reference calibration time; all the nodes directly connected with the quantum channel are subjected to time reference correction through the air, space, ground and sea integrated mechanical-solid interconnection quantum communication link, and the quantum time synchronization capacity of various working environments, global coverage, super-classical accuracy limit, electromagnetic interference resistance, interception and forgery resistance and large-scale networked distribution is formed.
As shown in fig. 1, the present invention provides an embodiment of a quantum time synchronization method for mechanical interconnection, including:
s101, establishing a mechanical-solid interconnection quantum communication link, wherein a fixed all-optical link is established through an optical fiber, a mobile all-optical link is established through a precise tracking and aiming system, an adaptive optical compensation system and the like, and the mechanical-solid interconnection quantum communication link is opened through a wavelength conversion system;
s102, constructing a quantum time synchronization end system, namely generating a quantum clock signal through a quantum light source, analyzing the arrival time of the quantum clock signal by using a time interval counter and correcting a local high-precision clock, and realizing the anti-interception high-precision quantum time synchronization of the clock signal;
s103, mechanical-solid interconnection quantum time synchronization, namely, an air, space, ground and sea integrated mechanical-solid interconnection quantum communication link is constructed, and the high-precision, high-reliability, high-safety and networking quantum time synchronization capability of multi-domain support and wide-area coverage is realized.
As shown in fig. 2, the present invention illustrates an embodiment of an mechanically interconnected quantum communication link. The fixed nodes A, B, C, D are directly connected through an optical fiber channel, the optical fiber channel does not contain a repeater and an amplifier, and the working waveband is the lowest loss waveband of the communication optical fiber; the fixed node A and the aerial maneuvering node F are connected through a free space optical channel, the establishment and maintenance of the channel are realized through a precise tracking and aiming system, and the problem of quantum state degradation caused by an aviation boundary layer is solved through a self-adaptive optical compensation system; the fixed node C and the deep space maneuvering node G (namely a satellite-borne platform) are connected through a free space optical channel, and are also provided with a precise tracking and aiming system and an adaptive optical system, and the working waveband of the free space optical channel can be an atmospheric transmission window or an atmospheric transmission window resisting solar radiation; the fixed node D is located underwater, the fixed node D is connected with the maneuvering node E which is also located underwater through an underwater optical channel, the establishment and the maintenance of the channel are realized through a precise tracking and aiming system, the problem of quantum state degradation caused by factors such as underwater waves, currents, temperature and salt is solved by a self-adaptive optical compensation system, and the working waveband is an underwater transmission window. And a set of wavelength conversion systems are respectively arranged at the fixed nodes A, C, D, and the mechanical and solid interconnection of the free space optical channel of A-F, C-G, the underwater optical channel of D-E and the optical fiber channel of A-B, B-C, C-D is realized from the quantum signal level.
Fig. 3 shows a typical bidirectional quantum time synchronization system embodiment based on an entangled light source. The node A and the node B are respectively provided with a high-precision clock which is used as a reference of the entanglement light source A and the entanglement light source B to be moderate, one path of single photon of the entanglement light source A is transmitted to the position B through a circulator and an optical fiber channel and detected through a single photon detector, one path of single photon of the entanglement light source B is transmitted to the position A through the circulator and the optical fiber channel and detected through the single photon detector, the other path of single photon of the entanglement light source A and the other path of single photon of the entanglement light source B are detected through a local single photon detector, the time difference of signals detected by the two single photon detectors at A, B is compared through a time interval counter, and the relative time difference of the high-precision clocks at A, B can be determined through the open channel interaction time difference. The quantum clock signal transmitted by the single photon also meets the Heisenberg inaccuracy measuring principle, the quantum unclonable principle, the quantum irreproducible principle and the like, so that the quantum clock signal also has the safety property of quantum communication.
The invention provides an embodiment of a quantum time synchronization method of mechanical-solid interconnection, which comprises the following steps:
s201, firstly, establishing a mechanical-solid interconnection quantum communication link, wherein a fixed all-optical link is constructed through optical fibers, a maneuvering all-optical link is constructed through a precise tracking and aiming system, a self-adaptive compensation optical system and the like, the working waveband of an optical fiber channel is the lowest loss waveband of the communication optical fiber near 1550nm, the working waveband of a free space optical channel can be an atmospheric transmission window near 808nm, and can also be a 1550+ nm long-wave waveband resistant to solar background light interference; the working waveband of the underwater optical channel can be blue-green light, and low-loss communication among the free space optical channel, the underwater optical channel and the optical fiber channel is realized through the wavelength conversion system; (ii) a
S202, generating entangled photons through a quantum entanglement light source and transmitting the entangled photons through a quantum communication link, detecting each path of photons by using a single photon detector, analyzing the arrival time of a quantum clock signal by using a time interval counter, comparing respective high-precision clocks of two communication parties and calibrating time by taking clock difference as reference;
and S203, carrying out time reference correction on all the nodes directly connected with the quantum channel through an air, space, ground and sea integrated mechanical-solid interconnection quantum communication link to form quantum time synchronization capability of various working environments, global coverage, super-classical accuracy limit, electromagnetic interference resistance, interception and forgery resistance and large-scale networked distribution.
The invention provides an embodiment of a quantum time synchronization method of mechanical-solid interconnection, which integrates a quantum communication technology and a laser time synchronization technology, establishes a quantum communication link of mechanical-solid interconnection through a precise tracking system, a self-adaptive optical compensation system, a wavelength conversion system and the like, establishes a quantum time synchronization system through a quantum light source, a high-precision clock, a time interval counter and the like, realizes a quantum time synchronization function by utilizing the quantum communication link of mechanical-solid interconnection, and provides a brand new technical means for wide-area high-precision high-safety time synchronization under rejection conditions of electromagnetic pressing and the like.
In some embodiments, quantum communication aims at fidelity lossless quantum state transmission, a communication process meets the heisenberg inaccuracy measuring principle, the quantum unclonable principle, the quantum inseparable principle and the like, unconditional safety of a theoretical level is achieved, information transmission carriers include but are not limited to single photons, entangled single photons, spintrons, continuous variable modulation optical signals and the like, and specific protocols, system structures, networking modes and specific parameters of quantum communication are not limited.
In some embodiments, the mechanical-solid interconnection link faces an all-optical link established by quantum communication, fixed targets are directly connected through a relay-free non-amplification low-loss optical fiber, and free-space maneuvering targets are stably connected through channels and low-loss transmission of all-optical signals through an accurate tracking and aiming system and an adaptive compensation system by taking the atmosphere as a transmission medium.
In some embodiments, stable connection of channels and low-loss transmission of all-optical signals are realized between underwater maneuvering targets by using water as a transmission medium through a precise tracking system and an adaptive compensation system.
In some embodiments, the various links may be interconnected in a physical domain or in an information domain, the quantum clock signal may not fall to the ground when the physical domains are interconnected, and may be directly forwarded through the wavelength conversion system, and the quantum clock signal may fall to the ground when the information and the information are interconnected, and may perform time synchronization in a cascade manner.
In some embodiments, the setting-up mode, handshake protocol, operating band and operating mechanism of the all-optical link in each application scenario are not limited.
In some embodiments, quantum time synchronization compiles a time synchronization signal to a quantum state, clock synchronization is realized through quantum state fidelity lossless transmission, and both sides of time synchronization need to be provided with a high-precision clock and use the clock as a reference clock of quantum communication; the quantum time synchronization has higher precision than the classical time synchronization, the clock synchronization signal can be compatible with the safety of quantum communication, and the quantum time synchronization using the light quantum as a carrier has the anti-electromagnetic interference capability.
In some embodiments, the specific scheme and parameter index of the quantum time synchronization are not limited, and the specific implementation manner and standard protocol of the quantum time synchronization system are not limited.
The invention also provides an embodiment of a computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the above-mentioned method.
The invention also provides an embodiment of 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 method for establishing a mechanical-solid interconnection quantum communication link, which can establish the quantum communication link for various mobile and fixed nodes in the air, the sky, the ground and the sea and provide important support for a quantum communication network;
secondly, the invention provides a quantum time synchronization method based on machine-solid interconnection, which can improve the precision and the safety of the time synchronization of the fixed-network optical cable, solve the problem of work incapability of the traditional radio time synchronization means under the extreme environment such as electromagnetic pressing and the like, and realize the reliability upgrade of the time synchronization under various application scenes;
finally, the invention expands the service scope of quantum communication and quantum network, improves the coverage of quantum time synchronization, and provides powerful guarantee for the efficient operation of various platforms based on the quantum time synchronization network.
For convenience of description, the above devices are described as being divided into various units by function, and are described separately. Of course, the functionality of the units may be implemented in one or more software and/or hardware when implementing the present application.
As will be appreciated by one skilled in the art, 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 flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams 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 a typical configuration, a computing device includes one or more processors (CPUs), input/output interfaces, network interfaces, and memory.
The memory may include forms of volatile memory in a computer readable medium, Random Access Memory (RAM) and/or non-volatile memory, such as Read Only Memory (ROM) or flash memory (flash RAM). Memory is an example of a computer-readable medium.
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 computer storage media 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 that can be used to store information that can be accessed by a computing device. As defined herein, a computer readable medium does not include a transitory computer readable medium such as a modulated data signal and a carrier wave.
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 an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, for the system embodiment, since it is substantially similar to the method embodiment, the description is simple, and for the relevant points, reference may be made to the partial description of the method embodiment.
The above description is only an example of the present application and is not intended to limit the present application. Various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.
Claims (10)
1. A quantum time synchronization method of mechanical-solid interconnection comprises the following steps:
establishing a machine-fixed interconnection quantum communication link, establishing a fixed all-optical link and a maneuvering all-optical link, and connecting the machine-fixed interconnection quantum communication link through a wavelength conversion system;
constructing a quantum time synchronization end system, generating a quantum clock signal through a quantum light source, analyzing the arrival time of the quantum clock signal by using a time interval counter and correcting a local high-precision clock, and realizing the anti-interception high-precision quantum time synchronization of the clock signal;
and step three, synchronizing the mechanical-solid interconnection quantum time, constructing an air, space, ground and sea integrated mechanical-solid interconnection quantum communication link, and realizing multi-domain support and wide area coverage networking quantum time synchronization.
2. The quantum time synchronization method for the mechanical-solid interconnection of claim 1, wherein the first step is to construct a fixed all-optical link through an optical fiber, and the second step is to construct a mobile all-optical link through a precise tracking and aiming system and an adaptive compensation optical system.
3. The mechanical-solid interconnection quantum time synchronization method according to claim 1, wherein the third step is implemented by integrating air, space, ground and sea mechanical-solid interconnection quantum communication links, and performing time reference correction on all nodes directly connected with quantum channels to form quantum time synchronization capabilities of various working environments, global coverage, ultra-classical accuracy limit, electromagnetic interference resistance, interception and forgery resistance and large-scale networked distribution.
4. The quantum time synchronization method for mechanical-mechanical interconnection according to claim 1 or 2, wherein the optical fiber channel operating band is a communication optical fiber minimum loss band around 1550 nm.
5. The quantum time synchronization method of mechanical-solid interconnection of claim 1 or 2, wherein the free space optical channel operating band is an atmospheric transmission window around 808nm or a 1550+ nm long wave band resistant to interference of solar background light.
6. The quantum time synchronization method for the mechanical-solid interconnection of claims 1 to 5, wherein the working waveband of the underwater optical channel is blue-green light, and low-loss communication of the free space optical channel, the underwater optical channel and the optical fiber channel is realized through a wavelength conversion system.
7. The quantum time synchronization method for the machine-fixed interconnection according to one of claims 1 to 6, wherein the machine-fixed interconnection links are all-optical links established for quantum communication, fixed targets are directly connected through a relay-free non-amplification low-loss optical fiber, free-space maneuvering targets are stably connected through channels and all-optical signals through a precise tracking and aiming system and an adaptive compensation system by taking the atmosphere as a transmission medium; water is used as a transmission medium between underwater maneuvering targets, and stable connection of channels and low-loss transmission of all-optical signals are realized through a precise tracking and aiming system and a self-adaptive compensation system.
8. The quantum time synchronization method of the mechanical-mechanical interconnection, according to one of claims 1 to 6, characterized in that the quantum time synchronization compiles a time synchronization signal onto a quantum state, and realizes clock synchronization through quantum state fidelity lossless transmission, wherein both time synchronization parties need to be equipped with a high-precision clock and use the clock as a reference clock for quantum communication.
9. A system for realizing the quantum time synchronization method of the machine-fixed interconnection of the claims 1-8 comprises an optical fiber, a precise tracking system, an adaptive optical compensation system, a wavelength conversion system, a quantum light source, a time interval counter, a fixed all-optical link constructed by the optical fiber, a maneuvering all-optical link constructed by the precise tracking system and the adaptive compensation optical system, a machine-fixed interconnection quantum communication link opened by the wavelength conversion system, an entangled photon generated by the quantum entangled light source and transmitted by the quantum communication link, a single photon detector for detecting each path of photon and a time interval counter for analyzing the arrival time of a quantum clock signal, respective high-precision clocks of two communication parties are compared, and the clock difference is used as the reference for calibrating the time; all the nodes directly connected with the quantum channel are subjected to time reference correction through the air, space, ground and sea integrated mechanical-solid interconnection quantum communication link, and the quantum time synchronization capacity of various working environments, global coverage, super-classical accuracy limit, electromagnetic interference resistance, interception and forgery resistance and large-scale networked distribution is formed.
10. A computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the method of any one of claims 1 to 8.
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