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Free keywords:
QUANTUM-NOISE; PARAMETRIC AMPLIFICATION; TWIN BEAMS; LIGHT; STATES;
INTERFERENCE; TOMOGRAPHY; CRYSTALPhysics;
Abstract:
Using a traveling-wave optical parametric amplifier with two orthogonally oriented type-I BBO crystals pumped by picosecond pulses, we generate vertically and horizontally polarized squeezed vacuum states within a broad frequency-angular range. Depending on the phase between these states, fluctuations in one or another Stokes parameter are suppressed below the shot-noise limit. Because of the large number of photon pairs produced, no local oscillator is required, and 3 dB squeezing is observed by means of direct detection.
