Konstanz 1998 – wissenschaftliches Programm
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Q: Quantenoptik
Q 7: Quanteneffekte II
Q 7.7: Vortrag
Montag, 16. März 1998, 17:30–17:45, R 513
Homodyne measurement of exponential phase moments and quantum phase reconstruction — •M. Dakna1, G. Breitenbach2, J. Mlynek2, T. Opatrný3, S. Schiller2, and D.-G. Welsch1 — 1Theoretisch-Physikalisches Institut, Friedrich-Schiller-Universität Jena, Max-Wien-Platz 1, 07743 Jena — 2Fakultät für Physik, Universität Konstanz, 78457 Konstanz — 3Department of Theoretical Physics, Palacký University Olomouc, Svobody 26, 771 46 Olomouc, Czech Republic
It is well known that balanced homodyne detection can be used for direct sampling of the photon-number statistics of a radiation field mode from the measured quadrature-component distributions. Here we show that the method also applies to the direct determination of the exponential moments of the canonical (London) phase. This enables us to experimentally verify fundamental number–phase uncertainty relations that have been studied theoretically. Further, the sampled exponential phase moments can advantageously be used to reconstruct the canonical phase distribution in a straightforward way by simple summation. In the experiments both coherent states and squeezed states produced by a parametric amplifier are considered.