Quantum Phase Diffusion Noise Measurements in a CW Optical Parametric Oscillator

Raymond Arrathoon, Anthony E.. Siegman

Michele N. Notarnicola, Marco G. Genoni, S. Cialdi +2 more

We address the exploitation of an optical parametric oscillator (OPO) in the task of mitigating, at least partially, phase noise produced by phase diffusion. In particular, we analyze two scenarios where phase diffusion is typically present. The first one is the measurement of the phase of a noisy optical field, while the second involves a quantum estimation scheme of a phase shift imposed on a noisy probe. In both cases, we prove that an OPO may lead to a partial or full compensation of the noise.

Anthony E.. Siegman, Raymond Arrathoon

J.-Y. Courtois, A. D. Smith, Claude Fabre +1 more

We calculate by the semiclassical method the noise spectra of a non-degenerate optical parametric oscillator operating above threshold when taking into account two independent diffusion processes on the pump phase and on the signal-idler phase difference. We also show that the phase diffusion processes are important when calculating the quantum noise in an optical parametric oscillator for noise frequencies close to the beat frequency between the signal and idler modes.

S. Cialdi, Edoardo Suerra, Stefano Olivares +2 more

We address the use of optical parametric oscillator (OPO) to counteract phase diffusion, and demonstrate phase-noise reduction for coherent signals traveling through a suitably tuned OPO. In particular, we theoretically and experimentally show that there is a threshold value on the phase noise, above which OPO can be exploited to "squeeze" phase noise. The threshold depends on the energy of the input coherent state, and on the relevant parameters of the OPO, i.e., gain and input-output and crystal loss rates.

Katsuyuki Kasai, Jiangrui Gao, Ling-An Wu +1 more