Nonunity gain minimal-disturbance measurement

Metin Sabuncu, L. Mišta, J. Fiurášek, R. Filip, G. Leuchs, Ulrik Lund Andersen

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Abstract

We propose and experimentally demonstrate an optimal nonunity gain Gaussian scheme for partial measurement of an unknown coherent state that causes minimal disturbance of the state. The information gain and the state disturbance are quantified by the noise added to the measurement outcomes and to the output state, respectively. We derive the optimal trade-off relation between the two noises and we show that the tradeoff is saturated by nonunity gain teleportation. Optimal partial measurement is demonstrated experimentally using a linear optics scheme with feedforward.
Original languageEnglish
JournalPhysical Review A
Volume76
Issue number3
Pages (from-to)032309
ISSN2469-9926
DOIs
Publication statusPublished - 2007

Bibliographical note

Copyright 2007 American Physical Society

Keywords

  • INFORMATION
  • QUANTUM TELEPORTATION
  • VARIABLES

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