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 language | English |
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Journal | Physical Review A |
Volume | 82 |
Issue number | 2 |
Pages (from-to) | 021801 |
ISSN | 2469-9926 |
DOIs | |
Publication status | Published - 2010 |