Quantum Processing of Images by Continuous Wave Optical Parametric Amplification

Abstract

We have experimentally shown that a degenerate optical parametric oscillator pumped by a cw laser, inserted in a cavity having degenerate transverse modes such as a hemiconfocal or confocal cavity, and operating below the oscillation threshold in the regime of phase sensitive amplification, is able to process input images of various shapes in the quantum regime. More precisely, when deamplified, the image is amplitude squeezed; when amplified, its two polarization components are intensity correlated at the quantum level. In addition, the amplification process of the images is shown to take place in the noiseless regime.

Multi-mode of Four and Six Wave Parametric Amplified Process

“…Moreover, the FWM system has narrow bandwidth and high generation rate14 and could be treated as a phase-insensitive amplifier15 with low noise. Thus it could be applied to further multi-mode configurations such as cascaded FWM16 process and quantum network, while it is also favorable in quantum entangled imaging171819, nonclassical squeezing states202122 and coherent slow light.…”

Near-field intensity correlations in parametric photoluminescence from a planar microcavity

“…Quantum correlations in many-body and optical systems are playing a crucial role in a variety of fields, from the microscopic study of novel states of matter in quantum fluids, 1,2 to the control and suppression of noise in optical systems, [3][4][5][6][7] to the exploration of analog models of gravitational and cosmological systems. [8][9][10] In this perspective, nonlinear optical systems exhibit a rich variety of phenomena, 11,12 involving the interplay of parametric scattering with losses, nonlinear energy shifts, and the peculiar dispersion of light in confined geometries.…”

Quantum coherent control of highly multipartite continuous-variable entangled states by tailoring parametric interactions

“…However these photons belong, in general, to different transverse modes TEM pl (degenerate in frequency), characterized by a constant value of the sum f = 2p + |l|, known as "family index" [37]. As well, even several families of transverse modes can become relevant in the case of a degenerate cavity such as the the confocal [31,34,51] or the self-imaging cavity [40,52], in which many different families (with different family indices f ) resonate at the same frequency. We will use a single generic index to label this discrete series of modes.…”

“…In this paper we propose an alternative approach based on the use of a naturally multimode optical parametric oscillator, either in the spatial [31][32][33][34][35][36][37][38][39][40][41][42] or in the temporal domain [43,44]. Below threshold, they produce multimode squeezed states, which has been observed experimentally [42,45].…”