Phase Sensitive Amplification in Metastable Helium at Room Temperature
TL;DR: In this article, phase sensitive amplification in metastable helium at room temperature is presented, and the maximum obtainable gain is larger than 4.8 with a bandwidth of 100 kHz.
Abstract: In this paper, we present our work on phase sensitive amplification performed in metastable helium at room temperature. The maximum obtainable gain is larger than 4.8 with a bandwidth of 100 kHz.
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TL;DR: A noiseless optical amplifier is implemented using a phase-sensitive four-wave mixing process in rubidium vapor and it is observed that it supports hundreds of spatial modes, making it possible to amplify complex two-dimensional spatial patterns with less than a 10% degradation of the input signal-to-noise ratio.
Abstract: We implement a noiseless optical amplifier using a phase-sensitive four-wave mixing process in rubidium vapor. We observe performance near the quantum limit for this type of amplifier over a range of experimental parameters and show that the noise figure is always better than would be obtained with a phase-insensitive amplifier with the same gain. Additionally, we observe that the amplifier supports hundreds of spatial modes, making it possible to amplify complex two-dimensional spatial patterns with less than a 10% degradation of the input signal-to-noise ratio for gains up to 4.6. To confirm the multimode character of the amplifier, we study the noise figure as a function of spatially-varying losses. Additionally, we investigate the spatial resolution of the amplifier and show that it supports a range of spatial frequencies from 1.3 to more than 35 line pairs per millimeter.
88 citations
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TL;DR: The observation of quantum correlations on light produced using all four of these systems, regardless of their substructure, suggests that it should be possible to use other systems with similar level structures in order to produce narrow frequency, non-classical beams at a particular wavelength.
Abstract: We present experimental results showing that quantum correlated light can be produced using non-degenerate, off-resonant, four-wave mixing (4WM) on both the D1 (795 nm) and D2 (780 nm) lines of (85)Rb and (87)Rb, extending earlier work on the D1 line of (85)Rb. Using this 4WM process in a hot vapor cell to produce bright twin beams, we characterize the degree of intensity-difference noise reduction below the standard quantum limit for each of the four systems. Although each system approximates a double-lambda configuration, differences in details of the actual level structure lead to varying degrees of noise reduction. The observation of quantum correlations on light produced using all four of these systems, regardless of their substructure, suggests that it should be possible to use other systems with similar level structures in order to produce narrow frequency, non-classical beams at a particular wavelength.
45 citations
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TL;DR: In this article, the experimental observation of coherent population oscillation (CPO)-based light storage in an atomic vapor cell at room temperature is reported. But it does not involve any atomic coherences and has the advantage of being robust to dephasing effects such as small magnetic field inhomogeneities.
Abstract: We report the experimental observation of coherent population oscillation (CPO-) based light storage in an atomic vapor cell at room temperature. Using the ultranarrow CPO between the ground levels of a $\ensuremath{\Lambda}$ system selected by polarization in metastable $^{4}\mathrm{He}$, such a light storage is experimentally shown to be phase preserving. As it does not involve any atomic coherences it has the advantage of being robust to dephasing effects such as small magnetic field inhomogeneities. The storage time is limited by the population lifetime of the ground states of the $\ensuremath{\Lambda}$ system.
26 citations
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