Tunable delay of Einstein–Podolsky–Rosen entanglement

A. M. Marino (), R. C. Pooser, V. Boyer and P. D. Lett
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A. M. Marino: Joint Quantum Institute, National Institute of Standards and Technology and University of Maryland, Gaithersburg, Maryland 20899, USA
R. C. Pooser: Joint Quantum Institute, National Institute of Standards and Technology and University of Maryland, Gaithersburg, Maryland 20899, USA
V. Boyer: Joint Quantum Institute, National Institute of Standards and Technology and University of Maryland, Gaithersburg, Maryland 20899, USA
P. D. Lett: Joint Quantum Institute, National Institute of Standards and Technology and University of Maryland, Gaithersburg, Maryland 20899, USA

Nature, 2009, vol. 457, issue 7231, 859-862

Abstract: Quantum images Quantum networks will require a system that can delay quantum correlations without significant degradation, effectively acting as a short-term quantum memory. An important benchmark for such systems is the ability to delay Einstein–Podolsky–Rosen (EPR) levels of entanglement and to be able to tune the delay. Marino et al. use a process called four-wave mixing in atomic vapour cells to obtain an optically tunable delay for EPR entangled beams of light. The four-wave mixing preserves the quantum spatial correlations of the entangled beams, allowing the authors to demonstrate a rudimentary quantum memory for images.

Date: 2009
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DOI: 10.1038/nature07751

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