Laser autocalibration for QKD systems

一种自动校准、激光器的技术，应用在传输系统、数字传输系统、电磁波传输系统等方向，能够解决传输速率降低、光子计数下降、误比特率增加等问题

Inactive Publication Date: 2007-04-25
MAGIQ TECH INC
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, once the system is set up, timing drifts due to various system factors and environmental factors, and photon counts may drop
This results in a reduction in the transmission rate of the system and results in an increased bit error rate (i.e. less than optimal system performance)

Method used

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  • Laser autocalibration for QKD systems
  • Laser autocalibration for QKD systems
  • Laser autocalibration for QKD systems

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Embodiment Construction

[0017] The present invention relates to a method of performing automatic calibration of a QKD system to maintain optimal system performance. In particular, the present invention relates to performing laser gate scanning during operation of a QKD system to determine optimal laser gate position (timing), and performing laser gate timing dithering to maintain optimal laser gate size ( i.e. width) and position. This results in optimal photon signal detection (ie the maximum number of photon signal counts) in a QKD system, which generally corresponds to optimal operation of the QKD system as a whole. Preferably, the invention is carried out by a controller programmed so that the system can be maintained to operate at or near ideal without operator intervention. Such automatic calibration is required in commercial QKD systems.

[0018] The invention is applicable to unidirectional, bidirectional, ring topology and n-directional QKD systems using polarization encoding or phase enco...

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Abstract

A method of autocalibrating a quantum key distribution (QKD) system (200) is disclosed. The QKD system includes a laser ((202) that generates photon signals in response to a laser gating signal (S0) from a controller (248). The method includes first performing a laser gate scan (304) to establish the optimum arrival time (TMAX) of the laser gating signal corresponding to an optimum-e.g., a maximum number of photon counts (NMAX)-from a single-photon detector (SPD) unit (216) in the QKD system when exchanging photon signals between encoding stations (Alice and Bob) of the QKD system. Once the optimal laser gating signal arrival time (TMAX) is determined, the laser gate scan is terminated and a laser gate dither process (308) is initiated. The laser dither involves varying the arrival time (T) of the laser gating signal around the optimum value of the arrival time TMAX. The laser gate dither provides minor adjustments to the laser gating signal arrival time to ensure that the SPD unit produces an optimum (e.g., maximum) number of photon counts.

Description

[0001] claim priority [0002] This application claims priority to US Provisional Patent Application 60 / 554,687, filed March 19,2004. technical field [0003] The present invention relates to the technical field of quantum encryption, and has industrial applicability in the field of quantum encryption, more specifically, relates to a device and a method for automatically calibrating a quantum key distribution (QKD) system to maintain the best system performance, and has the same characteristics as the automatic calibrating Quantum key distribution (QKD) systems with associated industrial applicability of apparatus and methods for maintaining optimal system performance. Background technique [0004] Quantum key distribution (QKD) involves using a weak (e.g. average 0.1 photon (photon)) optical signal ("photon signal") sent over a "quantum channel" ”) to establish a key between. The security of key distribution is based on the quantum mechanism principle that any measurement...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L9/00H04B10/30H04L9/08
CPCH04B10/30H04L9/0852H04B10/70
Inventor 乔纳桑·杨哈里·维格迈克尔·J.·拉加塞
Owner MAGIQ TECH INC
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