Cross-medium equipment-independent and discrete modulation continuous variable quantum key distribution system

A quantum key distribution, device-independent technology, applied to key distribution, can solve the problems of short effective distance, low performance of continuous variable quantum key distribution, etc., and achieve the effect of improving the security level

Active Publication Date: 2020-05-08
WUXI TAIHU UNIV +1
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  • Abstract
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Problems solved by technology

[0006] In order to achieve the above purpose, the present invention provides a device-independent and discretely modulated continuous variable quantum key distribution

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  • Cross-medium equipment-independent and discrete modulation continuous variable quantum key distribution system
  • Cross-medium equipment-independent and discrete modulation continuous variable quantum key distribution system
  • Cross-medium equipment-independent and discrete modulation continuous variable quantum key distribution system

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Embodiment Construction

[0059] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0060] Such as figure 1 As shown, the device-independent and discretely modulated continuous variable quantum key distribution system across media is characterized in that it consists of a transmitter, a receiver Alice, a receiver Bob, and a transmission medium; the transmitter is composed of a trusted middle party Responsible for preparing and sending the quantum state, and performing photon subtraction operations; the receiving end Alice is used to receive a...

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Abstract

The invention discloses a cross-medium equipment-independent and discrete modulation continuous variable quantum key distribution system. An eight-state quantum state is prepared by a trusted intermediate party through discrete modulation, the eight-state quantum state is sent to Alice and Bob after photon subtraction, Alice and Bob perform demodulation and homodyne detection on the received quantum state respectively, and a security key is established within an effective distance. According to the invention, a continuous variable quantum key distribution technology in a free space is improved, and the quantum state is prepared and sent by the trusted intermediate party, so that the system has equipment independence, and the communication security is ensured; the photon subtraction operation can improve the entanglement degree between the quanta so as to improve the transmission distance; the homodyne detection can effectively filter the interference of the outside on the optical signal, and the detection result can be well obtained even if the optical signal is influenced to a certain extent. The scheme is oriented to equipment independence under an air-water channel, discrete modulation continuous variable quantum key distribution is utilized, and more practicability is brought to free space communication of quanta.

Description

technical field [0001] The invention belongs to the technical field of free space continuous variable quantum key distribution, and relates to a device-independent and discretely modulated continuous variable quantum key distribution system across media. Background technique [0002] The law of quantum mechanics determines that Alice at the receiving end and Bob at the receiving end can use quantum key distribution (QKD) to achieve secure information transmission under an insecure quantum channel. Usually, QKD uses the phase information of weak laser pulses as the information carrier, and the farther the distance is, the lower the security of QKD is. One of the main reasons for this phenomenon is the rapid decay of inter-quantum entanglement, and the transmission distance between QKD protocols can be effectively improved by increasing the quantum entanglement. [0003] The transmission of quantum information in atmospheric channels faces a more complex environment than in o...

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Application Information

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IPC IPC(8): H04L9/08
CPCH04L9/0852H04L9/0855
Inventor 郭迎莫伟陈国俊彭清泉吴学林曹昱唐瑞明毛云
Owner WUXI TAIHU UNIV
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