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Quantum-Atom Optics Downunder (QAO)

Multi-Spatial-Mode Squeezed Light from Four-Wave Mixing in Hot Rb Vapor

Paul D. Lett, Vincent Boyer, Alberto M. Marino, Colin F. McCormick, Neil Corzo, Kristen Lemons, K. M. Jones

Published Jan 1, 2007• 0 citations
Publisher

Abstract

We demonstrate multi-spatial-mode, nondegenerate four-wave mixing in hot atomic Rb vapor. We generate images with strong intensity-difference squeezing between the amplified probe and the generated conjugate beams. Measurements to quantify the multi-mode nature of the beams will be presented. We also report on progress in improving the relative-intensity squeezing. This narrowband, squeezed light near an atomic resonance is also of interest for experiments involving atomic ensembles.

DOI
10.1364/qao.2007.qwc2

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We demonstrate multi-spatial-mode, nondegenerate four-wave mixing in hot atomic Rb vapor. We generate images with strong intensity-difference squeezing between the amplified probe and the generated conjugate beams. Measurements to quantify the multi-mode nature of the beams will be presented. We also report on progress in improving the relative-intensity squeezing. This narrowband, squeezed light near an atomic resonance is also of interest for experiments involving atomic ensembles.
We have measured -3.5 dB (-8.1 dB corrected for losses) relative intensity squeezing between probe and conjugate beams generated by stimulated, nondegenerate four-wave mixing in hot rubidium vapor. Unlike early observations of squeezing in atomic vapors based on saturation of a two-level system, our scheme uses a resonant nonlinearity based on ground-state coherences in a three-level system. Since this scheme produces narrowband, squeezed light near an atomic resonance, it is of interest for experiments involving cold atoms or atomic ensembles.
We present experimental results on the generation of multi-spatial-mode, single-beam, quadrature squeezed light using four-wave mixing in hot Rb vapor. Squeezing and phase-sensitive deamplification are observed over a range of powers and detunings near the (85)Rb D1 atomic transition. We observe -3 dB of vacuum quadrature squeezing, comparable to the best single-spatial mode results previously reported using atomic vapors, however, produced here in multiple spatial modes. We confirm that the squeezing is present in more than one transverse mode by studying the spatial distribution of the noise properties of the field.
Entangled multi-spatial-mode fields have interesting applications in quantum information, such as parallel quantum information protocols, quantum computing, and quantum imaging. We study the use of a nondegenerate four-wave mixing process in rubidium vapor at 795 nm to demonstrate generation of quantum-entangled images. Owing to the lack of an optical resonator cavity, the four-wave mixing scheme generates inherently multi-spatialmode output fields. We have verified the presence of entanglement between the multi-mode beams by analyzing the amplitude difference and the phase sum noise using a dual homodyne detection scheme, measuring more than 4 dB of squeezing in both cases. This paper will discuss the quantum properties of amplifiers based on four-wave-mixing, along with the multi mode properties of such devices.
Entangled multi-spatial-mode fields have interesting applications in quantum information, such as parallel quantum information protocols, quantum computing, and quantum imaging. We study the use of a nondegenerate four-wave mixing process in rubidium vapor at 795 nm to demonstrate generation of quantum-entangled images. Owing to the lack of an optical resonator cavity, the four-wave mixing scheme generates inherently multi-spatialmode output fields. We have verified the presence of entanglement between the multi-mode beams by analyzing the amplitude difference and the phase sum noise using a dual homodyne detection scheme, measuring more than 4 dB of squeezing in both cases. This paper will discuss the quantum properties of amplifiers based on four-wave-mixing, along with the multi mode properties of such devices.