Experimental demonstration of squeezed-state quantum averaging

Mikael Østergaard Lassen, Lars Skovgaard Madsen, Metin Sabuncu, Radim Filip, Ulrik Lund Andersen

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Abstract

We propose and experimentally demonstrate a universal quantum averaging process implementing the harmonic mean of quadrature variances. The averaged variances are prepared probabilistically by means of linear optical interference and measurement-induced conditioning. We verify that the implemented harmonic mean yields a lower value than the corresponding value obtained for the standard arithmetic-mean strategy. The effect of quantum averaging is experimentally tested for squeezed and thermal states as well as for uncorrelated and partially correlated noise sources. The harmonic-mean protocol can be used to efficiently stabilize a set of squeezed-light sources with statistically fluctuating noise levels.
Original languageEnglish
JournalPhysical Review A
Volume82
Issue number2
Pages (from-to)021801
ISSN2469-9926
DOIs
Publication statusPublished - 2010

Bibliographical note

Copyright 2010 American Physical Society

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