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Phase lock in multi-channel quantum communication system

A communication system, phase locking technology, applied in key distribution, which can solve problems such as equipment not meeting performance goals

Inactive Publication Date: 2011-03-30
LUCENT TECH INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Although some achievements have been made in developing devices for quantum channels, the devices still fall short of performance targets, such as in quantum key distribution (QKD) rate and transmission distance

Method used

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  • Phase lock in multi-channel quantum communication system
  • Phase lock in multi-channel quantum communication system
  • Phase lock in multi-channel quantum communication system

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Experimental program
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Embodiment Construction

[0020] Reference herein to "one embodiment" or "an embodiment" refers to a specific feature, structure or characteristic that may be included in at least one embodiment of the present invention and described in connection with the embodiment. Appearances of the phrase "in one embodiment" in various parts of this specification are not necessarily all referring to the same embodiment, nor are discrete or alternative embodiments mutually exclusive of other embodiments.

[0021] Fig. 1 schematically illustrates a multi-channel quantum communication system 100 according to an embodiment of the present invention. More specifically, system 100 is adapted to use wave (frequency) division multiplexing for quantum key distribution (QKD). System 100 includes a transmitter 110 (Alice) and a receiver 130 (Bob) coupled via a transmission link (eg, optical fiber) 120 . Transmitter 110 has an optical frequency comb source (OFCS) 112 coupled to an optical modulator (OM) 116 . OFCS 112 genera...

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Abstract

A communication system adapted to use wavelength (frequency) division multiplexing for quantum-key distribution (QKD) and having a transmitter coupled to a receiver via a transmission link. In one embodiment, the receiver is adapted to (i) phase- shift a local oscillator (LO) signal generated at the receiver, (ii) combine the LO signal with a quantum-information (QI) signal received via the transmission link from the transmitter to produce interference signals, (iii) measure an intensity difference for these interference signals, and (iv) phase-lock the LO signal to the QI signal based on themeasurement result, hi one configuration, the QI signal has a plurality of pilot frequency components, each carrying a training signal, and a plurality of QKD frequency components, each carrying quantum key data. Advantageously, the system can maintain a phase lock for the QKD frequency components of the QI and LO signals, while the QKD frequency components of the QI signal continuously carry quantum key data.

Description

[0001] Cross References to Related Applications [0002] This application claims priority to US Provisional Patent Application No. 60 / 681,726, filed May 17, 2005, entitled "Auantum Keydistribution." The subject matter of this application is related to that of U.S. Patent Application No. xx / xxx,xxx, entitled "Multi-Channel Transmission of Quantum Information," filed on the same date as the present application, which is hereby incorporated by reference in its entirety. technical field [0003] The present invention relates to optical communication devices, and more particularly to devices for transmitting encrypted data using quantum cryptography. Background technique [0004] Cryptography is usually used to exchange messages between two or more nodes (users, stations) with enhanced or even perfect secrecy. Typical encryption methods use a publicly announced encryption / decryption algorithm in conjunction with a secret key used to provide confidentiality of transmitted informa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L9/08
Inventor 米哈拉·迪努克里斯托弗·J·多雷尔兰迪·克林顿·吉尔斯英诺科·康丹·马克·马罗姆
Owner LUCENT TECH INC