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Polarization compensation implementation device and method for continuous variable quantum key distribution system

A technology of quantum key distribution and implementation method, applied in the field of polarization compensation implementation devices, can solve the problems of non-locality of quantum teleportation, irrelevance of propagation medium, and reduced system security, etc., and achieve the effect of avoiding interception and retransmission attacks

Inactive Publication Date: 2017-08-18
CENT SOUTH UNIV
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  • Abstract
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Problems solved by technology

(3) Quantum teleportation is non-local and has nothing to do with the transmission medium
However, one of the biggest disadvantages of the GMCS scheme is that when the local oscillator light and signal light are transmitted in the channel, the attacker can use the local oscillator light sent by the sender to intercept and resend the attack, thereby reducing the security of the system

Method used

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  • Polarization compensation implementation device and method for continuous variable quantum key distribution system
  • Polarization compensation implementation device and method for continuous variable quantum key distribution system

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Embodiment

[0089] First, the sender and the receiver initialize the communication of the system, including the initialization of the signal source, modem, detector and control circuit in the system. The sender uses a laser to generate pulsed laser light, which passes through the first beam splitter BS 1 It is divided into two beams, 10% of which is used as signal light, and 90% of which is used as local oscillator light. The signal light passes through a high extinction ratio intensity modulator (AM) to cut the continuous laser to generate a 2MHz pulse signal. After the signal light passes through the modulator, it is attenuated to the quantum level by the attenuator, and then passes through the second polarization beam splitter PBS 2 Then sent to the quantum channel.

[0090] At the receiving end, the receiver uses a polarization compensation device composed of two Faraday mirrors to perform bidirectional modulation on the received signal light. The receiving side encodes and modulat...

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Abstract

The invention discloses a polarization compensation implementation device and a polarization compensation implementation method for a continuous variable quantum key distribution system. A sender transmits a laser pulse generated by a laser device via an optical fiber channel for a remote distance, then a receiver receives the laser pulse, and the receiver returns the laser pulse back to the sender after bidirectional modulation; and the sender performs homodyne measurement on a received quantum signal, and acquires the final secure key via error correction and privacy enhancement. Practicality of the continuous variable quantum cipher is promoted, and meanwhile, environmental disturbance and artificial attacks suffered by the quantum signal during a quantum communication process can be effectively suppressed.

Description

technical field [0001] The invention belongs to the technical field of quantum key distribution, and relates to a polarization compensation realization device and a polarization compensation realization method of a continuous variable quantum key distribution system based on two-way modulation coherent state. Background technique [0002] The society has entered the information age, and the Internet is developing day by day. People's life and work have been inseparable from the Internet. The security of quantum cryptography is also challenged, so the theory and technology of quantum cryptography have become an important research field of information science and technology. [0003] Quantum communication has the following main characteristics: (1) High information efficiency The information efficiency of photons in quantum channels is dozens of times higher than that of photons in classical channels. (2) Under the same conditions, the signal-to-noise ratio required for relia...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B10/50H04B10/508H04B10/54H04B10/548H04L9/08
CPCH04L9/0852H04B10/503H04B10/508H04B10/54H04B10/548
Inventor 郭迎赵微尹金玉谢才浪黄端李飞
Owner CENT SOUTH UNIV
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