Quantum Cryptography Approaching the Classical Limit

Christian Weedbrook; Stefano Pirandola; Seth Lloyd; Timothy C. Ralph

doi:10.1103/PhysRevLett.105.110501

Quantum Cryptography Approaching the Classical Limit

Christian Weedbrook, Stefano Pirandola, Seth Lloyd, Timothy C. Ralph

Computer Science

Research output: Contribution to journal › Letter › peer-review

Abstract

We consider the security of continuous-variable quantum cryptography as we approach the classical limit, i.e., when the unknown preparation noise at the sender's station becomes significantly noisy or thermal (even by as much as 10000 times greater than the variance of the vacuum mode). We show that, provided the channel transmission losses do not exceed 50%, the security of quantum cryptography is not dependent on the channel transmission, and is therefore incredibly robust against significant amounts of excess preparation noise. We extend these results to consider for the first time quantum cryptography at wavelengths considerably longer than optical and find that regions of security still exist all the way down to the microwave.

Original language	English
Article number	110501
Number of pages	4
Journal	Physical Review Letters
Volume	105
Issue number	11
DOIs	https://doi.org/10.1103/PhysRevLett.105.110501
Publication status	Published - 8 Sept 2010

Keywords

KEY DISTRIBUTION
CONTINUOUS-VARIABLES
COHERENT STATES
COMMUNICATION
Classical limits

Access to Document

10.1103/PhysRevLett.105.110501

http://prl.aps.org/abstract/PRL/v105/i11/e110501

Cite this

@article{90bac59f9deb4ab6a514725e96a3c41f,

title = "Quantum Cryptography Approaching the Classical Limit",

abstract = "We consider the security of continuous-variable quantum cryptography as we approach the classical limit, i.e., when the unknown preparation noise at the sender's station becomes significantly noisy or thermal (even by as much as 10000 times greater than the variance of the vacuum mode). We show that, provided the channel transmission losses do not exceed 50%, the security of quantum cryptography is not dependent on the channel transmission, and is therefore incredibly robust against significant amounts of excess preparation noise. We extend these results to consider for the first time quantum cryptography at wavelengths considerably longer than optical and find that regions of security still exist all the way down to the microwave.",

keywords = "KEY DISTRIBUTION, CONTINUOUS-VARIABLES, COHERENT STATES, COMMUNICATION, Classical limits",

author = "Christian Weedbrook and Stefano Pirandola and Seth Lloyd and Ralph, {Timothy C.}",

year = "2010",

month = sep,

day = "8",

doi = "10.1103/PhysRevLett.105.110501",

language = "English",

volume = "105",

journal = "Physical Review Letters",

issn = "0031-9007",

publisher = "American Physical Society",

number = "11",

}

TY - JOUR

T1 - Quantum Cryptography Approaching the Classical Limit

AU - Weedbrook, Christian

AU - Pirandola, Stefano

AU - Lloyd, Seth

AU - Ralph, Timothy C.

PY - 2010/9/8

Y1 - 2010/9/8

N2 - We consider the security of continuous-variable quantum cryptography as we approach the classical limit, i.e., when the unknown preparation noise at the sender's station becomes significantly noisy or thermal (even by as much as 10000 times greater than the variance of the vacuum mode). We show that, provided the channel transmission losses do not exceed 50%, the security of quantum cryptography is not dependent on the channel transmission, and is therefore incredibly robust against significant amounts of excess preparation noise. We extend these results to consider for the first time quantum cryptography at wavelengths considerably longer than optical and find that regions of security still exist all the way down to the microwave.

AB - We consider the security of continuous-variable quantum cryptography as we approach the classical limit, i.e., when the unknown preparation noise at the sender's station becomes significantly noisy or thermal (even by as much as 10000 times greater than the variance of the vacuum mode). We show that, provided the channel transmission losses do not exceed 50%, the security of quantum cryptography is not dependent on the channel transmission, and is therefore incredibly robust against significant amounts of excess preparation noise. We extend these results to consider for the first time quantum cryptography at wavelengths considerably longer than optical and find that regions of security still exist all the way down to the microwave.

KW - KEY DISTRIBUTION

KW - CONTINUOUS-VARIABLES

KW - COHERENT STATES

KW - COMMUNICATION

KW - Classical limits

UR - http://www.scopus.com/inward/record.url?scp=77956514963&partnerID=8YFLogxK

U2 - 10.1103/PhysRevLett.105.110501

DO - 10.1103/PhysRevLett.105.110501

M3 - Letter

SN - 0031-9007

VL - 105

JO - Physical Review Letters

JF - Physical Review Letters

IS - 11

M1 - 110501

ER -

Quantum Cryptography Approaching the Classical Limit

Abstract

Keywords

Access to Document

Other files and links

Cite this