Photon number resolution enhanced laser communication system and method

Abstract

The invention discloses a photon number resolution enhanced laser communication system and method. The system comprises a controller, a waveform generator, a pulse laser source, an adjustable attenuator, an array superconducting nanowire single-photon detector, a power amplifier, a power synthesizer, an analog-to-digital converter and an oscilloscope, wherein the controller carries out code modulation on data needing to be output and inputs the data to a waveform generator, the waveform generator converts the coded information into an electric pulse signal and outputs the electric pulse signalto the pulse laser source, the pulse laser source generates a corresponding optical pulse signal according to the input electric pulse signal, then the optical pulse signal is input into the array superconducting nanowire single-photon detector through the adjustable attenuator, a signal with photon number resolution is output through the power amplifier and the power synthesizer, and finally thesignal is received and collected by the oscilloscope after being shaped by the analog-to-digital converter. Error code interference caused by external optical space noise and dark noise of the superconducting detector is greatly reduced, so that the error rate is enabled to be close to the self-owned light quantum error code limit of optical communication.

Description

technical field [0001] The invention relates to the technical fields of quantum detection, laser communication, satellite communication, array superconducting single photon detection, and deep space communication, and in particular to an optical word-digit resolution enhanced laser communication system and method. Background technique [0002] The superconducting nanowire single photon detector (SNSPD) was prepared for the first time in 2000 by Gol’tsman et al. on the basis of previous theories. In order to increase the detection area and improve the efficiency of the detector, the current common SNSPD structure is made of a superconducting material film (niobium nitride (NbN), tungsten silicon (WSi), niobium titanium nitrogen (NbTiN), etc.) through electron beam exposure. (EB) and reactive ion etching (RIE) and other microfabrication methods to make a meandering line structure. Compared with other single-photon detectors, superconducting nanowire single-photon detectors ha...

AI Technical Summary

Problems solved by technology

However, the use of SNSPD to realize deep space communication is still limited by the interference noise of free light in space, the dark noise of the detector itself, and the quantum distribution of photons. Therefore, the technology to achieve a lower bit error rate of optical communication is particularly important for deep space detection. important

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