Plug and play quantum key distribution device
A quantum key distribution, plug-and-play technology, applied in key distribution, can solve the problem of increasing the quantum bit error rate, etc., and achieve the effect of enhancing stability, simple structure, and improving anti-interference ability
Inactive Publication Date: 2009-11-04
BEIJING UNIV OF POSTS & TELECOMM
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Problems solved by technology
[0006] 3. Rayleigh backscattering is also a problem with this system
[0007] At high repetition rates, due to the inherent bi-directional nature of the plug-and-play
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[0030] Below in conjunction with accompanying drawing and specific embodiment the present invention is described in further detail:
[0031] like figure 1 As shown, a plug-and-play quantum key distribution device uses a pulse laser (1) with an output center wavelength of 1310nm, the output light polarization state is +45° linearly polarized light, and is coupled into an optical ring device (2) , the same-direction output end of the optical circulator is connected to the input end 7a of the four-port polarization beam splitter (7). For the convenience of description, define the four-port polarization beam splitter (7) beam splitting surface to reflect vertically polarized light |v>, expressed by Λ2; transmit parallel state polarized light |h>, expressed by Λ1. After Λ1 is transmitted, it is returned by the 90° rotating Faraday reflector (12) through the phase modulator (11) through the 7c port, and its polarization direction is also rotated 90° while being returned by the 90° ...
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The invention aims at designing a quantum key distribution device with simple structure, easy construction, strong anti-interference capability and easy realization. A main optical path of the device is formed by sequentially connecting a photon source, an optical circulator, a four-port optical polarization beam splitter/combiner, a quantum channel, a phase modulator and a 90-degree Faraday rotation mirror. Two communication parties (a primary control party and a secondary control party) are connected together through the quantum channel. A reflection output port of the optical circulator on the primary control party is sequentially connected with a polarizer and a single photon detector for constituting a detection part; a reflection port of the four-port optical polarization beam splitter/combiner is connected with the 90-degree Faraday rotation mirror, and a transmittance port is sequentially connected with the phase modulator and the 90-degree Faraday rotation mirror, thereby constituting an information loading part. The quantum channel of the secondary control party is sequentially connected with the phase modulator and the 90-degree Faraday rotation mirror for constituting the information loading part. The combination of the four-port optical polarization beam splitter/combiner with the 90-degree Faraday rotation mirror eliminates the birefringence effect of optical devices and optical fibers and enhances the stability of a system.
Description
technical field [0001] The invention relates to the technical field of optical fiber transmission secure communication, in particular to a realization device in quantum key distribution. Background technique [0002] Existing classical cryptography is based on mathematical problems such as the decomposition of large prime factors. With the development of high-performance computers, especially the successful development of quantum computers, the existing cryptosystem will no longer be difficult to break. Quantum cryptography is based on the basic principles of quantum mechanics and is an emerging interdisciplinary subject combining quantum mechanics and classical cryptography. Quantum cryptography communication is currently recognized by the scientific community as the only communication method that can achieve absolute security. It has successfully solved problems that cannot be solved by mathematics alone in traditional cryptography, and has attracted great attention from t...
Claims
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Inventor 马海强焦荣珍王川李林霞吴张斌
Owner BEIJING UNIV OF POSTS & TELECOMM