Optical quantum OFDM communication system and quantum information detection method thereof

A communication system and optical quantum technology, which is applied in the optical quantum OFDM communication system and its quantum information detection field, can solve the problems of large data volume, large delay, weak signal, etc., and achieve broad application prospects, low optical power, and low complexity Effect

Inactive Publication Date: 2018-06-29
FUDAN UNIV
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Problems solved by technology

Different from general traditional ground communication and near-Earth satellite communication, deep space communication has characteristics such as long distance, weak signal, large and unstable delay, and large amount of data. Alt

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  • Optical quantum OFDM communication system and quantum information detection method thereof
  • Optical quantum OFDM communication system and quantum information detection method thereof
  • Optical quantum OFDM communication system and quantum information detection method thereof

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Embodiment 1

[0025] In the embodiment, the optical quantum OFDM communication system, and the positive semi-definite operator measurement and the least square root detection method are specifically introduced as follows:

[0026] 1 Quantum OFDM system based on MZI

[0027] The main idea of ​​OFDM is to divide the channel into several sub-channels in the frequency domain, modulate a sub-carrier on each sub-channel, and transmit each sub-carrier in parallel. However, the MZI-based OFDM system can be fully implemented in the optical domain to meet the requirements of quantum communication.

[0028] At the sending end, in order to ensure the frequency interval between each sub-carrier, 8 optical quantum carriers are generated by OCG (Optical Comb Generator, Optical Frequency Comb Generator), which have equal frequency intervals and are orthogonal in the frequency domain. Then MZI is used to modulate the quantum states of 8 orthogonal optical quantum carriers. The quantum signal modulation me...

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Abstract

The invention discloses an optical quantum OFDM communication system and a quantum information detection method thereof. The invention introduces the orthogonal frequency division multiplexing technology to the quantum communication, and provides the quantum communication system based on an all-optical OFDM model; meanwhile, the invention presents that a transmitted quantum state symbol set is expanded under the optical quantum digital state representation, and the minimum square root measurement (SRM) method with better performance in the positive operator valued measure (POVM) is used for algorithm measurement. The invention gives the system design and the basic principle explanation and performance simulation method and result, and performs simulation on the quantum state detection performance and part factors affecting the system performance separately. Results show that for the optical quantum OFDM system, the bit error rate performance of the quantum detection method based on theminimum square root is better than that of the classical detection method.

Description

technical field [0001] The invention relates to an optical quantum OFDM communication system and a quantum information detection method thereof, belonging to the technical field of deep space communication measurement. Background technique [0002] In deep space exploration missions, the communication system shoulders the tasks of transmitting telemetry information, tracking and navigation, and transmitting scientific data, which is an important guarantee for the smooth execution of the entire deep space exploration mission. Deep space communication generally refers to the communication between various types of aircraft leaving earth orbit and between the aircraft and the ground control center. Different from general traditional ground communication and near-Earth satellite communication, deep space communication has characteristics such as long distance, weak signal, large and unstable delay, and large amount of data. Although traditional optical communication has large inf...

Claims

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Application Information

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IPC IPC(8): H04B10/70H04B10/075H04L27/26
CPCH04B10/075H04B10/70H04L27/2626H04L27/2647
Inventor 龚颖达赵晓魏陈佳
Owner FUDAN UNIV
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