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Quantum digital signature system

A quantum digital signature and single-photon detector technology, applied in digital transmission systems, transmission systems, photonic quantum communications, etc., can solve problems such as fiber channel birefringence, increase system complexity and instability, and system impact cannot be ignored , to achieve the effects of resisting channel polarization changes, facilitating mass production, and improving stability

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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Embodiment Construction

[0018] The present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

[0019] Such as figure 1 As shown, a quantum digital signature system includes a message sender Alice100, a message receiver Bob200, and a receiver Charlie300. The sender Alice100 sends a message combined with a digital signature to the receiver Bob200 and the receiver Charlie300. The receiver Bob200, as the authenticator of the message, forwards the information sent by the sender Alice100 to the receiver Charlie300,

[0020] The receiver Bob200 includes a laser Laser210, an optical intensity modulator IM220, an unequal arm MZ interferometer 230, and an adjustable attenuator EVOA240, and the laser Laser210 is sequentially connected to the optical intensity modulator IM220, unequal arm MZ interferometer Instrument 230 and adjustable attenuator EVOA240;

[0021] The composition of the recipient Charlie300 is exact...

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Abstract

A quantum digital signature system comprises a sender Alice of a message, a message receiver Bob and a receiver Charlie, the sender Alice sends the message to the receiver Bob and the receiver Charlie in combination with a digital signature, the receiver Bob serves as an authenticator of the message and forwards the message 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 system has the advantages that the light energy utilization rate can be improved to 100%, that is, the code rate of a QKD system is improved to two times of that of an original scheme; and the transmitting end interferometer is simple in structure, is only composed of one polarization beam splitter and one phase modulator and is easy to manufacture, and the receiving end interferometer and the transmitting end interferometer are identical in structure and convenient to manufacture in batches.

Description

technical field [0001] The invention relates to the technical field of quantum digital signatures, in particular to a quantum digital signature system. 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 digital signature (quantum digital ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L9/32H04L9/08H04B10/70H04B10/61H04B10/548H04B10/54
CPCH04L9/3247H04L9/0858H04B10/70H04B10/6162H04B10/548H04B10/54H04B10/614
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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