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Quiet moments in time

Marco Bellini

Published Jan 1, 2017• 0 citations
OpenAlex

Abstract

'Squeezed' light exhibits smaller quantum fluctuations than no light at all. Localized squeezed regions have now been produced along an infrared light wave and probed with unprecedented time resolution. See Letter p.376

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Measurement of the quantum states of squeezed light

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Nature•May 1, 1997•545 citations

Controlling local quantum fluctuations of light using four-wave mixing in an atomic vapour

Christopher S. Embrey

The spatial character of the noise on a light field affects its usefulness for imaging. Multi-spatial-mode (MSM) squeezed light has noise below the quantum noise limit in multiple spatial modes, and can be used for super resolution imaging. The generation of such light has long been an experimental goal within the field of quantum optics. \n \nThis work introduces the theory behind the generation of squeezed light, and its measurement using a homodyne detector. A four-wave mixing process in a rubidium 85 vapour is used to experimentally generate squeezed light. The properties of this squeezed light are investigated, through the use of homodyne detection with a bichromatic LO. \n \nThis thesis further investigates how the squeezed quadrature changes from amplitude to phase over a range of 40 MHz. The MSM nature of a squeezed light field is directly investigated. The field is shown to contain at least 75 squeezed spatial modes in the frequency domain, each squeezed at a level of up to -2.5 dB. This thesis develops techniques to measure the spatial character of noise on a light field in the time domain. These are promising techniques for the analysis of the MSM nature of a squeezed light in the time domain.

•Jul 1, 2016•0 citations

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Hydrogen Molecular Dissociation Driven by Quantum Light

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We investigate the dissociation dynamics of hydrogen molecular ions driven by nonclassical light by solving the time-dependent Schrödinger equation. The driving field is composed of horizontally polarized 400 nm coherent light and vertically polarized 800 nm quantum squeezed light. Our results reveal that the photon quantum fluctuations encoded in the squeezing parameter influence the kinetic energy release spectra and modulate the relative yields of competing dissociation channels. In particular, the photon-number statistics and phase uncertainty introduced by the quadrature-squeezed light can selectively enhance or suppress specific dissociation pathways. These findings highlight the potential of quantum light as a tunable resource for manipulating and probing the molecular dynamics. This Letter has implications on ultrafast chemistry with quantum light.

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•Jan 1, 2008•0 citations

Experimental study on the imaging of the squeezed state light at 1064 nm

L. Chen, Shulei Bi, Bao zhu Lu

Stable, low noise, infrared squeezed state tight at 1064 nm is generated by utilizing optical parametric down-conversion (OPDC) technique based on periodically poled KTiOPO 4 in a optical parametric amplifier (OPA) resonator. A non-classical noise reduction of 2.58 dB below the shot noise is observed through balanced homodyne detection. The squeezed state light is used to set up an imaging system for high-resolution imaging, and it is found that the resolution of image based on the amplitude-squeezed light is 1.26 times larger than that of infrared coherent light under the same intensity. The experimental results indicate that squeezed light is an important non-classical light, which can overcome the coherent laser shot-noise, the classical diffraction limit and limit of quantum noise.

Laser Physics•May 25, 2011•11 citations
The spatial character of the noise on a light field affects its usefulness for imaging. Multi-spatial-mode (MSM) squeezed light has noise below the quantum noise limit in multiple spatial modes, and can be used for super resolution imaging. The generation of such light has long been an experimental goal within the field of quantum optics. \n \nThis work introduces the theory behind the generation of squeezed light, and its measurement using a homodyne detector. A four-wave mixing process in a rubidium 85 vapour is used to experimentally generate squeezed light. The properties of this squeezed light are investigated, through the use of homodyne detection with a bichromatic LO. \n \nThis thesis further investigates how the squeezed quadrature changes from amplitude to phase over a range of 40 MHz. The MSM nature of a squeezed light field is directly investigated. The field is shown to contain at least 75 squeezed spatial modes in the frequency domain, each squeezed at a level of up to -2.5 dB. This thesis develops techniques to measure the spatial character of noise on a light field in the time domain. These are promising techniques for the analysis of the MSM nature of a squeezed light in the time domain.
We investigate the dissociation dynamics of hydrogen molecular ions driven by nonclassical light by solving the time-dependent Schrödinger equation. The driving field is composed of horizontally polarized 400 nm coherent light and vertically polarized 800 nm quantum squeezed light. Our results reveal that the photon quantum fluctuations encoded in the squeezing parameter influence the kinetic energy release spectra and modulate the relative yields of competing dissociation channels. In particular, the photon-number statistics and phase uncertainty introduced by the quadrature-squeezed light can selectively enhance or suppress specific dissociation pathways. These findings highlight the potential of quantum light as a tunable resource for manipulating and probing the molecular dynamics. This Letter has implications on ultrafast chemistry with quantum light.
Stable, low noise, infrared squeezed state tight at 1064 nm is generated by utilizing optical parametric down-conversion (OPDC) technique based on periodically poled KTiOPO 4 in a optical parametric amplifier (OPA) resonator. A non-classical noise reduction of 2.58 dB below the shot noise is observed through balanced homodyne detection. The squeezed state light is used to set up an imaging system for high-resolution imaging, and it is found that the resolution of image based on the amplitude-squeezed light is 1.26 times larger than that of infrared coherent light under the same intensity. The experimental results indicate that squeezed light is an important non-classical light, which can overcome the coherent laser shot-noise, the classical diffraction limit and limit of quantum noise.