Journal
PHYSICAL REVIEW A
Volume 82, Issue 2, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevA.82.021801
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Funding
- EU [212008]
- Danish Agency for Science Technology and Innovation [274-07-0509]
- Lundbeck Foundation
- Czech Ministry of Education [MSM 6198959213, LC06007]
- GA CR [202/08/0224]
- Lundbeck Foundation [R13-2007-1274] Funding Source: researchfish
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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.
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