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Physical Review A

Tuning, enhancing, and writing quantum images with input squeezed light

John Jeffers, Gian‐Luca Oppo

Published Sep 1, 1999• 4 citations
Publisher

Abstract

We consider the effect of squeezed input on quantum images in the output of the degenerate optical parametric oscillator. We find that the images can be made more intense than those produced using vacuum input. Moreover, adjusting the phase of the input light allows variation of the transverse wave vector for minimum fluctuations without affecting the output wave vector of maximum intensity. The use of spatially inhomogeneous squeezed input provides greater tuning of the spatial and nonclassical features of the output. In particular, writing quantum images becomes easy when diffractive effects and angle tuning of the input beams are utilized.

DOI
10.1103/physreva.60.2393

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We consider the effect of squeezed input on quantum images in the output of the degenerate optical parametric oscillator. We find that the images can be made more intense than those produced using vacuum input. Moreover, adjusting the phase of the input light allows variation of the transverse wave vector for minimum fluctuations without affecting the output wave vector of maximum intensity. The use of spatially inhomogeneous squeezed input provides greater tuning of the spatial and nonclassical features of the output. In particular, writing quantum images becomes easy when diffractive effects and angle tuning of the input beams are utilized.
Summary form only given.We study spatiotemporal fluctuations of the signal field in the output from a degenerate optical parametric oscillator using the Langevin model of A. Gatti et al. (1997). The spatial structure of the output signal is calculated for pump values just below the threshold for the formation of patterns with a critical wave vector. We consider the effects of a squeezed input signal, both homogeneous and spatially varying, on the output correlations, which can be measured in both the near- and far-field.
In this paper, experimental evidence of cw amplification of images in the quantum regime, using a phase sensitive optical parametric amplification operating inside transverse degenerate cavities. Injecting various images (mismatched Gaussian modes and double slits of different orientations) at the input of the device, showed that the output image was amplitude squeezed by 30% in the regime of deamplification of a type II frequency-degenerate OPO operating below threshold in a semi-confocal cavity, when the polarization of the input image is at 45deg from the crystal axes. The authors showed also that, in the regime of amplification, the two polarization components along the signal and idler axes had quantum correlated intensity fluctuations (intensity difference fluctuations measured at 30% below the standard quantum noise level).
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.
Quantum images, that is inhomogeneous field distributions purely generated by quantum fluctuations, persist when passing from the degenerate to the non-degenerate case of optical parametric oscillators (OPO). Below the threshold for parametric oscillation where the near-field distributions are homogeneous both in intensity and phase, appropriate spatial correlation functions anticipate the transverse spatial pattern that appears above threshold. In particular, the angular dependence of the far field spatial correlation function is able to reveal the travelling-wave nature of the phase pattern above threshold typical of nondegenerate OPOs. Cross-correlation functions between signal and idler intensities show clear evidence of the non-classical nature of the output light.