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Quantum digital signature system resistant to polarization disturbance

A quantum digital signature and polarization technology, which is applied in digital transmission system, transmission system, photonic quantum communication, etc., can solve the problems of increasing system complexity and instability, fiber channel birefringence, and system impact can not be ignored, so as to achieve convenient Effects of high-volume production, improved stability, and reduced cost and complexity

Pending Publication Date: 2021-09-03
神盾迅波(北京)量子科技发展有限公司
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AI Technical Summary

Problems solved by technology

However, in field application scenarios, commonly used optical fiber channels have birefringence and other effects, and the influence of channel polarization disturbance on the system cannot be ignored
Patent CN204993393U proposes a scheme based on polarization encoding, which requires an active polarization feedback system, which increases the complexity and instability of the system

Method used

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  • Quantum digital signature system resistant to polarization disturbance
  • Quantum digital signature system resistant to polarization disturbance
  • Quantum digital signature system resistant to polarization disturbance

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Embodiment Construction

[0019] The present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

[0020] like figure 1 As shown, a quantum digital signature system anti-polarization perturbation, including a message sender Alice100 and two message receivers Bob200 and receiver Charlie300, the sender Alice100 sends a message combined with a digital signature to the receiver Bob200 and The receiver Charlie300, the receiver Bob200 acts as the authenticator of the message, and forwards the information sent by the sender Alice100 to the receiver Charlie300,

[0021] The receiver Bob200 includes a laser Laser210, an optical intensity modulator IM220, an unequal arm MZ interferometer 230, an adjustable attenuator VOA240 and a depolarizer Depol250, and the laser Laser210 is connected to the optical intensity modulator IM220 in turn , unequal arms MZ interferometer 230, adjustable attenuator VOA240 and depolarizer De...

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Abstract

A quantum digital signature system resistant to polarization disturbance comprises a message sender Alice, two message receivers Bob and a receiver Charlie, the sender Alice sends a message to the receiver Bob and the receiver Charlie in combination with a digital signature, the receiver Bob serves as a message authenticator and forwards information sent by the sender Alice to the receiver Charlie, and the composition of the receiver Charlie is completely the same as that of the receiver Bob. Compared with the prior art, the quantum digital signature scheme based on the phase coding BB84 quantum key distribution system can resist channel polarization disturbance. The photon polarization state change caused by channel disturbance does not influence the final interference result of the system, namely, the stability of the system can be ensured.

Description

technical field [0001] The invention relates to the technical field of quantum digital signatures, in particular to a quantum digital signature system anti-polarization disturbance. Background technique [0002] Digital signatures are widely used in many aspects, such as e-mail, financial transactions, etc., and are considered to be one of the most basic and practical inventions of modern cryptography. Digital signatures are usually used to ensure that information is signed by legitimate users under the condition that the identity is authenticated, and at the same time ensure that the information is transferable, unforgeable, and non-repudiable. However, the commonly used digital signature protocols at present all adopt the public key system, and its security depends on the computational complexity assumption of the specific problem. With the emergence of quantum computers, the security of classical digital signatures is facing a severe test. Fortunately, the quantum digit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L9/32H04L9/08H04B10/70H04B10/61H04B10/548H04B10/2507
CPCH04L9/3247H04L9/0852H04B10/70H04B10/6162H04B10/548H04B10/2572
Inventor 王东沈名轩
Owner 神盾迅波(北京)量子科技发展有限公司
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