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All-time quantum communication method based on circular polarization coding

A quantum communication, circular polarization technology, applied in photonic quantum communication, secure communication device, key distribution, can solve problems such as fear of light, and achieve the effect of improving transmission distance, improving collection efficiency, and enhancing anti-interference ability

Active Publication Date: 2018-10-16
SHANGHAI INST OF TECHNICAL PHYSICS - CHINESE ACAD OF SCI
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Problems solved by technology

[0010] In order to solve the problem of "satellite quantum communication" being afraid of light, suppress the background noise of sunlight during the day

Method used

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  • All-time quantum communication method based on circular polarization coding
  • All-time quantum communication method based on circular polarization coding
  • All-time quantum communication method based on circular polarization coding

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Embodiment Construction

[0020] In order to avoid the interference of the background of the visible light part of the sun, the wavelength λ is selected 1 =1549.9nm,λ 2 =1550.1nm, as a pair of random basis vectors, recorded as "1" and "2" respectively, the measurement basis vector corresponding to "1" is |1R>, |1L>, and the measurement basis vector corresponding to "2" is |2R >, |2L> (if attached figure 1 ), left-handed (R) and right-handed (L) polarization states correspond to signals 0 and 1, respectively. as attached figure 2 As shown, at the transmitting end, the laser wavelength "1" or "2" is randomly selected to generate the corresponding base vector signal. For filtering, if you choose filter 1 for "1" to measure |1R>, you will get |1R> with 100% probability, but if you choose filter 1 to measure |2R>, you will not get any information, so Unable to determine whether it is |2R> or |2L>, resulting in the loss of the original state of the message. Taking the classic BB84 protocol as an exampl...

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Abstract

The invention discloses an all-time quantum communication method based on circular polarization coding. The left-hand states and the right-hand states of two photons which are near a near infrared waveband and an even longer waveband and have extremely close wave lengths are creatively used as two pairs of orthogonal basis vectors to replace the straight line basis and the diagonal basis of traditional linear polarization coding. Compared with the traditional linear polarization coding technology, the circular polarization single-photon coding technology has the advantages that the anti-jamming capacity on the atmospheric environment in the photon propagation process can be enhanced, the information transmission efficiency is improved, the influences of sky background noise in daytime during detection are effectively reduced, and the error rate of key transmission is decreased. According to the method, the negative impacts brought by the linear polarization coding mode in existing satellite-ground quantum communication can be overcome, a novel cloud-frog-penetrating quantum communication method without needing satellite-ground basis vector correction is achieved, and a new path isprovided for achieving all-weather satellite-ground quantum communication.

Description

technical field [0001] The invention relates to quantum secure communication, and specifically refers to an all-time satellite-to-earth quantum communication method based on circularly polarized single-photon encoding. Background technique [0002] Satellite-based quantum communication breaks away from the shackles of optical fiber channels, transmits information in the atmosphere or vacuum, can realize long-distance wireless communication, and can cover the whole world. It is the most feasible means to build a global quantum communication network and has broad application prospects. With the successful launch of the world's first quantum science experimental satellite "Mozi", the satellite has successfully realized the first satellite-ground quantum communication in the world since it has been in operation for more than a year, and has achieved a series of major research results. Three established scientific goals: thousand-kilometer satellite-ground two-way quantum entangl...

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Application Information

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IPC IPC(8): H04B10/70H04B10/532H04L9/08
CPCH04B10/532H04B10/70H04L9/0858
Inventor 陆卫王文娟鹿建
Owner SHANGHAI INST OF TECHNICAL PHYSICS - CHINESE ACAD OF SCI
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