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High-power, visible-wavelength twin-beam correlations from four-wave mixing : for practical applications in absorption spectroscopy and imaging beyond the shot-noise limit

Jason D. Mueller

Published Jan 1, 2020• 0 citations
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Related papers

High-power, visible-wavelength twin-beam correlations from four-wave mixing

Jason D. Mueller

•Jan 1, 2020•0 citations

A practical model of twin-beam experiments for sub-shot-noise absorption measurements

Jason D. Mueller, Nigam Samantaray, Jonathan C. F. Matthews

Quantum-intensity-correlated twin beams of light can be used to measure absorption with precision beyond the classical shot-noise limit. The degree to which this can be achieved with a given estimator is defined by the quality of the twin-beam intensity correlations, which is quantified by the noise reduction factor. We derive an analytical model of twin-beam experiments, incorporating experimental parameters such as the relative detection efficiency of the beams, uncorrelated optical noise, and uncorrelated detector noise. We show that for twin beams without excessive noise, measured correlations can be improved by increasing the detection efficiency of each beam; notwithstanding, this may unbalance detection efficiency. However, for beams with excess intensity or other experimental noise, one should balance detection efficiency, even at the cost of reducing detection efficiency—we specifically define these noise conditions and verify our results with statistical simulation. This has application in design and optimization of absorption spectroscopy and imaging experiments.

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Coherent Light Generation Using Four-Wave Mixing

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Relative-Intensity Squeezing of High-Order Harmonic Twin Beams

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Abstract Relative intensity squeezing (RIS) is emerging as a promising technique for performing high-precision measurements beyond the shot-noise limit. A commonly used way to produce RIS in the visible/infrared range is generating correlated “twin beams” through four-wave mixing by driving atomic resonances with weak laser beams. Here, we propose an all-optical strong-field scheme to produce a series of relative-intensity-squeezed high-order harmonic “twin beams”. Due to the nature of high-harmonic generation, the frequencies of the “twin beams” can cover a broad range of photon energy. Our proposal paves the way for the development of non-classical XUV sources and high precision spectroscopy tools in the strong-field regime.

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Recent Developments in Four-Wave Light Mixing and Two-Photon Absorption Spectroscopy

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Generation of frequency-tunable twin beams and its application in sub–shot-noise FM spectroscopy

Haibo Wang, Zehui Zhai, Shaokai Wang +1 more

Widely frequency-tunable quantum-correlated twin beams have been experimentally demonstrated. The noise of the intensity difference between the signal and idler beams of the twin beams is reduced to more than 3 dB below the shot noise limit (SNL) throughout a wavelength-tuning range of 5.6 nm. A continuously frequency-tuning range of 2.8 GHz appears around the center wavelength of 1041.506 nm, where the maximum noise reduction of about 5.3 dB is observed. The tunable twin beams are used in frequency modulation (FM) spectroscopy of Cs 2 molecules and a spectrum with a sensitivity of about 4 dB beyond that of the SNL is obtained.

Europhysics Letters (EPL)•Oct 1, 2003•8 citations
Quantum-intensity-correlated twin beams of light can be used to measure absorption with precision beyond the classical shot-noise limit. The degree to which this can be achieved with a given estimator is defined by the quality of the twin-beam intensity correlations, which is quantified by the noise reduction factor. We derive an analytical model of twin-beam experiments, incorporating experimental parameters such as the relative detection efficiency of the beams, uncorrelated optical noise, and uncorrelated detector noise. We show that for twin beams without excessive noise, measured correlations can be improved by increasing the detection efficiency of each beam; notwithstanding, this may unbalance detection efficiency. However, for beams with excess intensity or other experimental noise, one should balance detection efficiency, even at the cost of reducing detection efficiency—we specifically define these noise conditions and verify our results with statistical simulation. This has application in design and optimization of absorption spectroscopy and imaging experiments.
Abstract Relative intensity squeezing (RIS) is emerging as a promising technique for performing high-precision measurements beyond the shot-noise limit. A commonly used way to produce RIS in the visible/infrared range is generating correlated “twin beams” through four-wave mixing by driving atomic resonances with weak laser beams. Here, we propose an all-optical strong-field scheme to produce a series of relative-intensity-squeezed high-order harmonic “twin beams”. Due to the nature of high-harmonic generation, the frequencies of the “twin beams” can cover a broad range of photon energy. Our proposal paves the way for the development of non-classical XUV sources and high precision spectroscopy tools in the strong-field regime.
Widely frequency-tunable quantum-correlated twin beams have been experimentally demonstrated. The noise of the intensity difference between the signal and idler beams of the twin beams is reduced to more than 3 dB below the shot noise limit (SNL) throughout a wavelength-tuning range of 5.6 nm. A continuously frequency-tuning range of 2.8 GHz appears around the center wavelength of 1041.506 nm, where the maximum noise reduction of about 5.3 dB is observed. The tunable twin beams are used in frequency modulation (FM) spectroscopy of Cs 2 molecules and a spectrum with a sensitivity of about 4 dB beyond that of the SNL is obtained.