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The Rochester Conferences on Coherence and Quantum Optics and the Quantum Information and Measurement meeting

Propagation of a bipartite entangled state through a fast–light medium

Jeremy B. Clark, Ryan T. Glasser, Quentin C. Glorieux, Ulrich Vogl, Paul D. Lett

Published Jan 1, 2013• 0 citations
Publisher

Abstract

We generate entangled twin beams using four-wave-mixing and investigate the behavior of the quantum correlations when one field is sent through a fast–light medium with anomalous dispersion. We report an advance of 3.7±0.1 ns, marking the realization of a negative temporal delay line for quantum states.
DOI
10.1364/cqo.2013.m6.39

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We recently demonstrated optical pulses with large negative group velocities using a scheme based on four-wave-mixing in rubidium vapor. Both the probe and the generated conjugate pulses can experience anomalous dispersion, and we have demonstrated a maximum group advancement of 64% relative to the input pulse width. The four-wave-mixing scheme allows us to send whole images through a fast light medium, and we have analyzed the arrival of spatially-encoded information in the system. We are currently investigating the transport of quantum correlations that are shared by the probe and conjugate modes when sent through fast light media.
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Due to its vital role in many quantum information and communication protocols, much theoretical and experi- mental work has been conducted in order to investigate the fundamental properties of entanglement. In this work we describe an experimental investigation into the behavior of continuous-variable entanglement and quantum mutual information upon propagation through slow- and fast-light media. A four-wave mixing process in warm atomic vapor is used to generate an entangled two-mode squeezed vacuum state of light. One of the two modes of the resulting state is then sent through a second four-wave mixing process that is tuned to exhibit either slow- or fast-light properties. The cross-correlation and quantum mutual information shared between the resulting modes is quanti ed, and di erences in their behavior after propagation through slow- and fast-light media are discussed.