Squeezed States using Parametric Processes

Sergei A. Akhmanov, А. В. Белинский, Anatolii S Chirkin

A theory of generation of squeezed states of an optical field is developed for parametric interactions of diffracted beams. It is shown that diffraction results in degradation of the squeezing process. Systems for the formation of beams that can compensate for this effect are considered.

Skylar Turner, Brian R. La Cour

Xiang‐Bin Wang, L. C. Kwek, C. H. Oh

Ranjit Singh, Alexander Evgen’evich Teretenkov

Theoretically it is shown that high quantum sensitivity of the squeezed state of the Schrodinger cat relative to the non-squeezed state can be achieved. For realization of squeezing the Schrodinger cat state, a parametric process in a nonlinear optical crystal is used. To visualize the squeezed state of the Schrodinger cat with and without a displacement, the values of the Wigner functions are calculated.

A. D. Jannussis, E. Vlahos, Vasileios Bartzis

Ling-An Wu, Min Xiao, Harry J. Kimble

Squeezed states of the electromagnetic field are generated by degenerate parametric downconversion in a sub-threshold optical parametric oscillator. Reductions in photocurrent noise greater than 60% (−4 dB) below the limit set by the vacuum fluctuations of the field are observed in a balanced homodyne detector. A quantitative comparison with theory suggests that the observed noise reductions result from a field that in the absence of avoidable linear attenuation would be squeezed more than tenfold. A degree of squeezing of approximately fivefold is inferred for the actual field emitted through one mirror of the optical parametric oscillator. An explicit demonstration of the Heisenberg uncertainty principle for the electromagnetic field is made from the measurements, which show that the field state produced by the downconversion process is a state of minimum uncertainty.