Experimental demonstration of squeezed-state quantum averaging
PHYSICAL REVIEW A, vol.82, no.2, 2010 (SCI-Expanded, Scopus)
- Publication Type: Article / Article
- Volume: 82 Issue: 2
- Publication Date: 2010
- Doi Number: 10.1103/physreva.82.021801
- Journal Name: PHYSICAL REVIEW A
- Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
- Dokuz Eylül University Affiliated: Yes
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.