Quantum and optical technology

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Bulk contribution from isotropic media in surface sum-frequency generation

Physical Review B American Physical Society (APS) 66:20 (2002) 205110

Authors:

H Held, AI Lvovsky, X Wei, YR Shen
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Synthesis and tomographic characterization of the displaced Fock state of light

Physical Review A American Physical Society (APS) 66:1 (2002) 011801

Authors:

AI Lvovsky, SA Babichev
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Quantum-optical catalysis: Generating nonclassical states of light by means of linear optics

Physical Review Letters 88:25 I (2002) 2504011-2504014

Authors:

AI Lvovsky, J Mlynek

Abstract:

The preparation and characterization of a new quantum state of light, a coherent superposition of the single-photon and vaccum states was discussed. This state was generalized by a catalytic process in which the single photon state enabled the interaction without being affected. A transition between a highly classical and a highly nonclassical state of light occurred by changing the amplitude of the target coherent state.

Quantum-optical catalysis: generating nonclassical states of light by means of linear optics.

Physical review letters 88:25 Pt 1 (2002) 250401

Authors:

AI Lvovsky, J Mlynek

Abstract:

We report preparation and characterization of coherent superposition states t[0>+alpha]1> of the electromagnetic field by conditional measurements on a beam splitter. This state is generated in one of the beam splitter output channels if a coherent state [alpha> and a single-photon Fock state [1> are present in the two input ports and a single photon is registered in the other beam splitter output. The single photon thus plays a role of a "catalyst:" it is explicitly present in both the input and the output channels of the interaction yet facilitates generation of a nonclassical state of light.
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Cabello's nonlocality and linear optics

Physical Review Letters 88:9 (2002) 989011

Abstract:

A study on the quantum nonlocality without inequalities and without probabilities for two observers was performed. Cabello's proposal for nonlocality was challenged and it was shown that nonlinear optics was required for a loophole-free demonstration of Cabello's nonlocality. Cabello had proposed a way of testing the inequality by means of linear optics and used the product of two observable quantities as a single quantum measurement.