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Quantum Information and Measurement (QIM)

Macroscopic entangled states by delocalized single-photon addition

Nicola Biagi, Luca S. Costanzo, Marco Bellini, Alessandro Zavatta

Published Jan 1, 2019• 2 citations
Publisher

Abstract

We report an experimental realization of macroscopic entangled states obtained by applying delocalized single-photon creation operations on two uncorrelated temporal modes populated by coherent states. Entanglement is preserved as the mean photon number increases.
DOI
10.1364/qim.2019.t3a.2

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We report an experimental realization of entangled states obtained by applying a superposition of single-photon creation operations between two uncorrelated temporal modes populated by coherent states of the same amplitude. Such entangled states of light can be populated with a large number of photons while preserving their non classical correlations. Besides their importance from the fundamental point of view to study quantum effects in large-scale systems, these states are found to be surprisingly robust against losses [1] and thus well suited to travel over long distances and to be stored in atomic ensembles.
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We present a concise review of recent experimental results concerning the conditional implementation of coherent superpositions of single-photon additions onto distinct field modes. Such a basic operation is seen to give rise to a wealth of interesting and useful effects, from the generation of a tunable degree of entanglement to the birth of peculiar correlations in the photon numbers and the quadratures of multimode, multiphoton, states of light. The experimental investigation of these properties will have an impact both on fundamental studies concerning, for example, the quantumness and entanglement of macroscopic states, and for possible applications in the realm of quantum-enhanced technologies.
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