Device-independent high channel capacity quantum communication system and method

Abstract

The invention belongs to the technical field of information processing, and discloses a device-independent high channel capacity quantum communication system and method. The communication method includes the following steps: adopting a hyper-entangled state under multiple degrees of freedom as a quantum carrier, establishing a device-independent hyper-entangled quantum communication model, and carrying out dense coding; and verifying the channel capacity by calculating the amount of information that each particle can transmit and comparing the amount of information with the amount of information in other protocols; and meanwhile, the invention discloses a device-independent high channel capacity quantum communication system. According to the scheme of the invention, the distribution of twodevice-independent keys can be completed by distributing two particles, and the quantum efficiency reaches 1; and if a common entangled state such as a Bell state is used as the quantum carrier, thedistribution of only one device-independent key can be completed by distributing the two particles, and the quantum efficiency is only 0.5.

Description

technical field [0001] The invention belongs to the technical field of information processing, and in particular relates to a device-independent high channel capacity quantum communication system and method. Background technique [0002] At present, the existing technologies commonly used in the industry are as follows: [0003] In order to promote the practical application of quantum communication, security and channel capacity improvement under the premise of security are two key issues that need to be solved urgently. In previous studies, the security of quantum communication is guaranteed by the principle of quantum mechanics, and both the quantum state preparation source and the measurement equipment are assumed to be perfect by default. However, under realistic conditions, it is difficult to achieve perfect preparation of source and measurement equipment. Therefore, there may be various security risks in the actual quantum communication system. Aiming at the imperfe...

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Problems solved by technology

However, none of the above studies on quantum secure communication under the premise of untrustworthy equipment has not considered a problem that is indispensable in any communication: the problem of coding efficiency has not been considered. Under the premise of untrustworthy equipment, the actual channel capacity will be greatly reduced. , if the channel capacity in the communication is too low, it is impossible to realize a practical quantum-safe communication protocol

[0005] The existing technology is very insecure in actual communication

Most of the existing technologies do not consider the potential safety hazards caused by untrustworthy equipment. Even if there are a few technologies that consider the factor of untrustworthy equipment, they have not considered the problem of low coding efficiency caused by untrustworthy equipment.

[0006] Therefore, the existing technology is safe in theory, but not safe in practice, and the efficiency is not high

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