Reconstruction of Wigner Functions on Different Observation Levels

Vladimír Bužek

F. Mallet, Manuel A. Castellanos-Beltran, Hsiang‐Sheng Ku +3 more

T. Kiss, Петер Адам, József Janszky

Vladimír Bužek, G. Adam, G. Drobný

We apply the Jaynes principle of maximum entropy [Phys. Rev. 106, 620 (1957); 108, 171 (1957)] for a reconstruction of Wigner functions of quantum-mechanical states of light on different observation levels. We study how quantum interference between components of superpositions of coherent states, which is responsible for the appearance of nonclassical effects, can be detected on different observation levels. We analyze in detail the reconstruction of Wigner functions of squeezed states on different observation levels in the case of nonunit detection efficiency modeled as a decay of the state under consideration into a zero-temperature reservoir. \textcopyright{} 1996 The American Physical Society.

J. Bertrand, P. Bertrand

Maria Bondani, Alessia Allevi, Alessandra Andreoni

We present the reconstruction of the Wigner function of a classical phase-sensitive state, a pulsed coherent state, by measurements of the distributions of detected-photons of the state displaced by a coherent probe field. By using a hybrid photodetector operated above its photon-resolving regime, we obtain both the statistics at different values of the probe field and the values of the probe phase required to reconstruct the Wigner function.