A Time Synchronization Method in Quantum Network
A time synchronization and network technology, applied in the field of quantum communication, can solve problems such as difficulty in improving the accuracy of time synchronization, and achieve the effect of eliminating delay uncertainty and improving accuracy
Active Publication Date: 2018-10-30
ZHEJIANG SHENZHOU QUANTUM NETWORK TECH CO LTD
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Problems solved by technology
[0004] Aiming at the problem that the time synchronization accuracy is difficult to improve due to the uncertainty of network delay and the uncertainty of the transmission time from the application layer to the physical layer in the NTP protocol, the present invention provides a quantum network using the NTP protocol based on the characteristics of quantum communication itself. The time synchronization method of the time synchronization principle realizes high-precision time synchronization between the user and the server
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[0028] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.
[0029] The present invention comprises the following steps
[0030] A method for time synchronization in quantum networks,
[0031] (10) The user transmits signal photons to the server directly or via a relay station through the quantum network, and records the emission time T1;
[0032] (11) The server receives the signal photon sent by the user, and records the receiving time T2;
[0033] (12) The server sends signal photons back to the user through the quantum network, and records the emission time T3;
[0034] (13) The user receives the signal photon sent by the server, and records the receiving time T4;
[0035] (14) The server sends the values of T2 and T3 to the user through the classic network;
[0036] (15) The time delay of the signal photon passing through the relay station from the user to the server is recorded as Δt1;
[00...
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The invention relates to a time synchronization method in a quantum network. According to the method, a user emits signal photons to a server through the quantum network and records emitting time T1; the server receives the signal photons and records receiving time T2; the server emits the signal photons to the user and records emitting time T3; the user receives the signal photons emitted by the server and records receiving time T4; time delay of a relay station is recorded, so that time relay indeterminacy of the signal photons passing through the relay station can be eliminated, and therefore, time consumed by the emission of the signal photons from the user to the server through the relay station and by means of the quantum network and time consumed by the emission of the signal photons from the server to the user through the relay station can be identical, and the accuracy of time synchronization can be improved.
Description
technical field [0001] The invention belongs to the field of quantum communication, and in particular relates to a time synchronization method in a quantum network. Background technique [0002] With the development of science and technology, the accuracy of time measurement has been continuously improved, and the application of high-precision time frequency has become very important. The application of high-precision time frequency is inseparable from high-precision time synchronization technology. With the wide application of high-precision time synchronization technology in basic scientific research, navigation and positioning, electric power, communication, and modern national defense, the accuracy requirements for time synchronization technology are also getting higher and higher. [0003] However, the timing accuracy of NTP (Network Time Protocol), which is widely used on the network, is not very ideal. For example, a kind of time synchronization method based on time...
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IPC IPC(8): H04J3/06H04B10/70
Inventor 夏从俊喻斌黄天其李在光
Owner ZHEJIANG SHENZHOU QUANTUM NETWORK TECH CO LTD