11 research outputs found
Polarization squeezing of intense pulses with a fiber Sagnac interferometer
We report on the generation of polarization squeezing of intense, short light
pulses using an asymmetric fiber Sagnac interferometer. The Kerr nonlinearity
of the fiber is exploited to produce independent amplitude squeezed pulses. The
polarization squeezing properties of spatially overlapped amplitude squeezed
and coherent states are discussed. The experimental results for a single
amplitude squeezed beam are compared to the case of two phase-matched,
spatially overlapped amplitude squeezed pulses. For the latter, noise variances
of -3.4dB below shot noise in the S0 and the S1 and of -2.8dB in the S2 Stokes
parameters were observed, which is comparable to the input squeezing magnitude.
Polarization squeezing, that is squeezing relative to a corresponding
polarization minimum uncertainty state, was generated in S1.Comment: v4: 2 small typos corrected v3: misc problems with Tex surmounted -
mysteriously missing text returned to results - vol# for Korolkova et al. PRA
v2: was a spelling change in author lis
Stokes-operator-squeezed continuous-variable polarization states
We investigate nonclassical Stokes-operator variances in continuous-wave polarization-squeezed laser light generated from one and two optical parametric amplifiers. A general expression of how Stokes-operator variances decompose into two-mode quadrature operator variances is given. Stokes parameter variance spectra for four different polarization-squeezed states have been measured and compared with a coherent state. Our measurement results are visualized by three-dimensional Stokes-operator noise volumes mapped on the quantum Poincare sphere. We quantitatively compare the channel capacity of the different continuous-variable polarization states for communication protocols. It is shown that squeezed polarization states provide 33% higher channel capacities than the optimum coherent beam protocol