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Quantum Information and Measurement (QIM)

Photon subtraction from a multimode squeezed vacuum state

Adrien Dufour, Clément Jacquard, Young-Sik Ra, Claude Fabre, Nicolas Treps

Published Jan 1, 2017• 4 citations
Publisher

Abstract

We present the generation and characterization of a multimode non-gaussian state. We prepare squeezed vacua in multiple time-frequency modes, subtract a single photon, and then characterize the state by using mode-selective homodyne detection.
DOI
10.1364/qim.2017.qt4b.2

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This work establishes a versatile theoretical framework that explicitly describes non-Gaussian states that are obtained, in an heralded fashion, by applying a single-photon subtraction to a multimode resource. The treatment focuses on the very common experimental situation in which no mode-selective operation is available. The obtained theoretical framework allows retrieving, given a multimode input state, optimal conditions for heralding as well as for non-Gaussian feature detection, thus providing a powerful toolbox for experiments' design. The application of the proposed approach to the case study of Schr\odinger kitten preparation starting from a frequency multimode squeezed state illustrates the pertinence and impact of the derived theoretical tools.
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Optical non-Gaussian quantum states can be generated in a heralded manner by applying a photon subtraction operation to a Gaussian input state. In our work, we develop a theoretical framework to describe this operation in the case where the input state is spectrally multimode. This framework allows the optimal design of photon subtraction experiments. We give the exact expression of the generated non-Gaussian state in the general case. We apply this framework to the case of Schrodinger kitten state generation using a multimode squeezed vacuum as input state. We show that the quality of the generated state (in terms of fidelity and Wigner function negativity) can be enhanced by adapting the different experimental parameters.