Measurement of the 'single-photon' velocity and classical group velocity in standard optical fibre

J. D. Ingham, J. E. Carroll, I. H. White, R. M. Thompson

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

When engineering secure optical communication networks, it may be important to know if the photon velocity may be altered in a dispersive fibre by selecting photonic states with different ranges of Schrödinger frequencies, (N + 1/2)f where f is the modal frequency. This paper reports on a comparison between the velocity of approximate single-photon states (N ≈ 1) and the classical optical group velocity (N ≫ 1 with a range of N). The experiments use the same source and the same novel technique with a single temporal standard to measure the time of flight of both 'single photons' and classical optical energy over standard optical fibre. Within the experimental accuracy (approximately 0.2 ns in 30 000 ns, or 6.3 km of fibre) there is no evidence for changes of velocity as the composition of the number states varies. This suggests that photons travel in a dispersive fibre with a velocity that is independent of the Schrödinger frequencies. It is believed that this is the first such test on kilometre lengths of standard fibre.

Original languageEnglish
Article number045
Pages (from-to)1538-1546
Number of pages9
JournalMeasurement Science and Technology
Volume18
Issue number5
DOIs
Publication statusPublished - 1 May 2007

Keywords

  • Group velocity
  • Optical fibre propagation
  • Quantum optics
  • Single photons
  • Time-of-flight measurement

ASJC Scopus subject areas

  • Instrumentation
  • Applied Mathematics

Cite this

Measurement of the 'single-photon' velocity and classical group velocity in standard optical fibre. / Ingham, J. D.; Carroll, J. E.; White, I. H.; Thompson, R. M.

In: Measurement Science and Technology, Vol. 18, No. 5, 045, 01.05.2007, p. 1538-1546.

Research output: Contribution to journalArticle

@article{034c952328214d49943c94e457caed32,
title = "Measurement of the 'single-photon' velocity and classical group velocity in standard optical fibre",
abstract = "When engineering secure optical communication networks, it may be important to know if the photon velocity may be altered in a dispersive fibre by selecting photonic states with different ranges of Schr{\"o}dinger frequencies, (N + 1/2)f where f is the modal frequency. This paper reports on a comparison between the velocity of approximate single-photon states (N ≈ 1) and the classical optical group velocity (N ≫ 1 with a range of N). The experiments use the same source and the same novel technique with a single temporal standard to measure the time of flight of both 'single photons' and classical optical energy over standard optical fibre. Within the experimental accuracy (approximately 0.2 ns in 30 000 ns, or 6.3 km of fibre) there is no evidence for changes of velocity as the composition of the number states varies. This suggests that photons travel in a dispersive fibre with a velocity that is independent of the Schr{\"o}dinger frequencies. It is believed that this is the first such test on kilometre lengths of standard fibre.",
keywords = "Group velocity, Optical fibre propagation, Quantum optics, Single photons, Time-of-flight measurement",
author = "Ingham, {J. D.} and Carroll, {J. E.} and White, {I. H.} and Thompson, {R. M.}",
year = "2007",
month = "5",
day = "1",
doi = "10.1088/0957-0233/18/5/045",
language = "English",
volume = "18",
pages = "1538--1546",
journal = "Measurement Science and Technology",
issn = "0957-0233",
publisher = "IOP Publishing",
number = "5",

}

TY - JOUR

T1 - Measurement of the 'single-photon' velocity and classical group velocity in standard optical fibre

AU - Ingham, J. D.

AU - Carroll, J. E.

AU - White, I. H.

AU - Thompson, R. M.

PY - 2007/5/1

Y1 - 2007/5/1

N2 - When engineering secure optical communication networks, it may be important to know if the photon velocity may be altered in a dispersive fibre by selecting photonic states with different ranges of Schrödinger frequencies, (N + 1/2)f where f is the modal frequency. This paper reports on a comparison between the velocity of approximate single-photon states (N ≈ 1) and the classical optical group velocity (N ≫ 1 with a range of N). The experiments use the same source and the same novel technique with a single temporal standard to measure the time of flight of both 'single photons' and classical optical energy over standard optical fibre. Within the experimental accuracy (approximately 0.2 ns in 30 000 ns, or 6.3 km of fibre) there is no evidence for changes of velocity as the composition of the number states varies. This suggests that photons travel in a dispersive fibre with a velocity that is independent of the Schrödinger frequencies. It is believed that this is the first such test on kilometre lengths of standard fibre.

AB - When engineering secure optical communication networks, it may be important to know if the photon velocity may be altered in a dispersive fibre by selecting photonic states with different ranges of Schrödinger frequencies, (N + 1/2)f where f is the modal frequency. This paper reports on a comparison between the velocity of approximate single-photon states (N ≈ 1) and the classical optical group velocity (N ≫ 1 with a range of N). The experiments use the same source and the same novel technique with a single temporal standard to measure the time of flight of both 'single photons' and classical optical energy over standard optical fibre. Within the experimental accuracy (approximately 0.2 ns in 30 000 ns, or 6.3 km of fibre) there is no evidence for changes of velocity as the composition of the number states varies. This suggests that photons travel in a dispersive fibre with a velocity that is independent of the Schrödinger frequencies. It is believed that this is the first such test on kilometre lengths of standard fibre.

KW - Group velocity

KW - Optical fibre propagation

KW - Quantum optics

KW - Single photons

KW - Time-of-flight measurement

UR - http://www.scopus.com/inward/record.url?scp=34247097535&partnerID=8YFLogxK

U2 - 10.1088/0957-0233/18/5/045

DO - 10.1088/0957-0233/18/5/045

M3 - Article

VL - 18

SP - 1538

EP - 1546

JO - Measurement Science and Technology

JF - Measurement Science and Technology

SN - 0957-0233

IS - 5

M1 - 045

ER -