Towards higher precision and operational use of optical homodyne tomograms

Details Towards higher precision and operational use of optical homodyne tomograms Towards higher precision and operational use of optical homodyne tomograms

2012-03-13

arxiv.org/abs/1203.2974v1

Physics

Quantum Physics

11 pages, 6 figures, 1 table

Scientific paper

We present the results of an operational use of experimentally measured optical tomograms to determine state characteristics (purity) avoiding any reconstruction of quasiprobabilities. We also develop a natural way how to estimate the errors (including both statistical and systematic ones) by an analysis of the experimental data themselves. Precision of the experiment can be increased by postselecting the data with minimal (systematic) errors. We demonstrate those techniques by considering coherent and photon-added coherent states measured via the time-domain improved homodyne detection. The operational use and precision of the data allowed us to check for the first time purity-dependent uncertainty relations and uncertainty relations for Shannon and R\'{e}nyi entropies.

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