Continuous variable quantum key distribution modulation compensation system and implementation method thereof

A quantum key distribution and compensation system technology, applied in the field of continuous variable quantum key distribution modulation compensation system, can solve problems such as modulation defects, achieve low compensation hysteresis, reduce impact, increase maximum transmission distance and system security key rate Effect

Inactive Publication Date: 2018-04-20
CENT SOUTH UNIV
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Problems solved by technology

[0003] In order to achieve the above object, the present invention provides a continuous variable quantum key distribution modulation compensation system and

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  • Continuous variable quantum key distribution modulation compensation system and implementation method thereof
  • Continuous variable quantum key distribution modulation compensation system and implementation method thereof

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Embodiment Construction

[0036]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.

[0037] Continuous variable quantum key distribution modulation compensation system based on OFDM, such as Figure 1-2 shown, including:

[0038] The quantum key sending end is used for key generation, modulates the quantum signal, and sends the modulated signal to the quantum key receiving end through the quantum channel and sends the modulation defect signal in the modulation process to the I / Q correction compensation post-processing module;

[0039] The qua...

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Abstract

The invention discloses a continuous variable quantum key distribution modulation compensation system and a implementation method thereof. A quantum key sending terminal modulates a quantum signal tochange the quantum signal into the form of a plurality of subcarriers, and sends the subcarriers to a quantum key receiving terminal; the quantum key receiving terminal collects and processes the emitted signal, and sends the results to an I/Q correction compensation post processing module; and the I/Q correction compensation post processing module uses the least mean square algorithm to process the received signal. The continuous variable quantum key distribution modulation compensation system can overcome the modulation defects existing in a quantum key distribution system; especially for the imbalance of I/Q, the practical security of the continuous variable quantum key distribution system based on the orthogonal frequency division multiplexing is further improved.

Description

technical field [0001] The invention belongs to the technical field of optical fiber quantum communication, and relates to a continuous variable quantum key distribution modulation compensation system based on orthogonal frequency division multiplexing and an implementation method thereof. Background technique [0002] Quantum key distribution enables two long-distance untrusted quantum channels to safely share keys, and its security is guaranteed by the uncertainty principle of quantum mechanics and the quantum non-cloning theorem. At present, quantum key distribution is mainly divided into two types: discrete variable and continuous variable. Compared with discrete variable quantum key distribution, the quantum state of continuous variable quantum key distribution is easier to prepare, can be integrated into existing optical fiber systems, and can use efficient and low-cost homodyne detection or heterodyne detection technology, which makes Continuous variable quantum key ...

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Application Information

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IPC IPC(8): H04L9/08H04L27/26H04B10/70
CPCH04B10/70H04L9/0858H04L27/2627H04L27/2649
Inventor 张航毛宇李嘉伟
Owner CENT SOUTH UNIV
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