Optical Communication with Two-Photon Coherent States — Part III: Quantum Measurements Realizable with Photoemissive Detectors

Horace P. Yuen, Jeffrey H. Shapiro

Research output: Contribution to journalArticle

531 Citations (Scopus)

Abstract

In Part I of this three-part study it was shown that the use of two-photon coherent state (TCS) radiation may yield significant performance gains in free-space optical communication if the receiver makes a quantum measurement of a single field quadrature. In Part II it was shown that homodyne detection achieves the same signal-to-noise ratio as the quantum field quadrature measurement, thus providing a receiver which realizes the linear modulation TCS performance gain found in Part I. Furthermore, it was shown in Part II that if homodyne detection does exactly correspond to the field quadrature measurement, then a large binary communication performance gain is afforded by homodyne detection of antipodal TCS signals. The full equivalence of homodyne detection and single-quadrature field measurement, as well as that of heterodyne detection and two-quadrature field measurement, is established. Furthermore, a heterodyne configuration which uses a TCS image-band oscillator in addition to the usual coherent state local oscillator is studied. This configuration, termed TCS heterodyne detection, is shown to realize all the quantum measurements described by arbitrary TCS. The foregoing results are obtained by means of a representation theorem winch shows that photoemissive detection realizes the photon flux density measurement.

Original languageEnglish (US)
Pages (from-to)78-92
Number of pages15
JournalIEEE Transactions on Information Theory
Volume26
Issue number1
DOIs
StatePublished - Jan 1 1980

Fingerprint

Optical communication
Homodyne detection
Photons
Detectors
communication
recipient
performance
Winches
equivalence
Signal to noise ratio
Modulation
Fluxes
Radiation
Communication

ASJC Scopus subject areas

  • Information Systems
  • Computer Science Applications
  • Library and Information Sciences

Cite this

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abstract = "In Part I of this three-part study it was shown that the use of two-photon coherent state (TCS) radiation may yield significant performance gains in free-space optical communication if the receiver makes a quantum measurement of a single field quadrature. In Part II it was shown that homodyne detection achieves the same signal-to-noise ratio as the quantum field quadrature measurement, thus providing a receiver which realizes the linear modulation TCS performance gain found in Part I. Furthermore, it was shown in Part II that if homodyne detection does exactly correspond to the field quadrature measurement, then a large binary communication performance gain is afforded by homodyne detection of antipodal TCS signals. The full equivalence of homodyne detection and single-quadrature field measurement, as well as that of heterodyne detection and two-quadrature field measurement, is established. Furthermore, a heterodyne configuration which uses a TCS image-band oscillator in addition to the usual coherent state local oscillator is studied. This configuration, termed TCS heterodyne detection, is shown to realize all the quantum measurements described by arbitrary TCS. The foregoing results are obtained by means of a representation theorem winch shows that photoemissive detection realizes the photon flux density measurement.",
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