CA2168851A1 - System and Method for Quantum Cryptography - Google Patents

System and Method for Quantum Cryptography

Info

Publication number
CA2168851A1
CA2168851A1 CA2168851A CA2168851A CA2168851A1 CA 2168851 A1 CA2168851 A1 CA 2168851A1 CA 2168851 A CA2168851 A CA 2168851A CA 2168851 A CA2168851 A CA 2168851A CA 2168851 A1 CA2168851 A1 CA 2168851A1
Authority
CA
Canada
Prior art keywords
signals
delay
quantum
quantum channel
detectors
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CA2168851A
Other languages
French (fr)
Other versions
CA2168851C (en
Inventor
Keith James Blow
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
British Telecommunications PLC
Original Assignee
Keith James Blow
British Telecommunications Public Limited Company
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from PCT/GB1993/002075 external-priority patent/WO1994008409A1/en
Priority claimed from PCT/GB1993/002637 external-priority patent/WO1994015422A1/en
Application filed by Keith James Blow, British Telecommunications Public Limited Company filed Critical Keith James Blow
Publication of CA2168851A1 publication Critical patent/CA2168851A1/en
Application granted granted Critical
Publication of CA2168851C publication Critical patent/CA2168851C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L9/00—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols
    • H04L9/08—Key distribution or management, e.g. generation, sharing or updating, of cryptographic keys or passwords
    • H04L9/0816—Key establishment, i.e. cryptographic processes or cryptographic protocols whereby a shared secret becomes available to two or more parties, for subsequent use
    • H04L9/0852—Quantum cryptography
    • H04L9/0858—Details about key distillation or coding, e.g. reconciliation, error correction, privacy amplification, polarisation coding or phase coding
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L2209/00—Additional information or applications relating to cryptographic mechanisms or cryptographic arrangements for secret or secure communication H04L9/00
    • H04L2209/08—Randomization, e.g. dummy operations or using noise
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L2209/00—Additional information or applications relating to cryptographic mechanisms or cryptographic arrangements for secret or secure communication H04L9/00
    • H04L2209/34—Encoding or coding, e.g. Huffman coding or error correction

Abstract

In a method of communication using quantum cryptog-raphy an encryption alphabet is used for coding signals for on a quantum channel. The encryption alphabet comprises pairs of operators applied successively to single-photon signals transmitted onto the quantum channel with a pre-determined delay between them. When the signals are detected, the different signals of each pair are split according to their encoded state and directed to different detectors via paths giving a differential delay. The delay is substantially complementary to the original pre-determined delay. Coin-cidence detection is employed at the detectors to eliminate spurious detection counts.
CA002168851A 1993-09-09 1994-09-08 System and method for quantum cryptography Expired - Fee Related CA2168851C (en)

Applications Claiming Priority (11)

Application Number Priority Date Filing Date Title
EP93307120.1 1993-09-09
EP93307121 1993-09-09
EP93307120 1993-09-09
EP93307121.9 1993-09-09
PCT/GB1993/002075 WO1994008409A1 (en) 1992-10-07 1993-10-06 Quantum cryptography using discarded data
WOPCT/GB93/02075 1993-10-06
EP93310228.7 1993-12-17
EP93310228 1993-12-17
PCT/GB1993/002637 WO1994015422A1 (en) 1992-12-24 1993-12-23 System and method for key distribution using quantum cryptography
WOPCT/GB93/02937 1993-12-23
PCT/GB1994/001954 WO1995007584A1 (en) 1993-09-09 1994-09-08 System and method for quantum cryptography

Publications (2)

Publication Number Publication Date
CA2168851A1 true CA2168851A1 (en) 1995-03-16
CA2168851C CA2168851C (en) 1999-11-02

Family

ID=27514077

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002168851A Expired - Fee Related CA2168851C (en) 1993-09-09 1994-09-08 System and method for quantum cryptography

Country Status (9)

Country Link
US (1) US5757912A (en)
EP (1) EP0717897B1 (en)
JP (1) JP2951408B2 (en)
AU (1) AU678049B2 (en)
CA (1) CA2168851C (en)
DE (1) DE69408152T2 (en)
ES (1) ES2111950T3 (en)
HK (1) HK1008766A1 (en)
WO (1) WO1995007584A1 (en)

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Also Published As

Publication number Publication date
ES2111950T3 (en) 1998-03-16
US5757912A (en) 1998-05-26
JPH09502322A (en) 1997-03-04
HK1008766A1 (en) 1999-05-14
CA2168851C (en) 1999-11-02
EP0717897A1 (en) 1996-06-26
JP2951408B2 (en) 1999-09-20
DE69408152T2 (en) 1998-05-14
DE69408152D1 (en) 1998-02-26
AU678049B2 (en) 1997-05-15
AU7544094A (en) 1995-03-27
EP0717897B1 (en) 1998-01-21
WO1995007584A1 (en) 1995-03-16

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