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Experimental Demonstration of Decoherence Suppression by Quantum Measurement Reversal

Jong Chan Lee, Youn-Chang Jeong, Yong‐Su Kim, Yoon-Ho Kim

Published Jan 1, 2011• 2 citations
Publisher

Abstract

We experimentally demonstrated that the decoherence due to amplitude damping can be suppressed using quantum measurement reversal. By implementing two partial measurements, we succeeded in preferentially selecting the cases where states do not experience decoherence.
DOI
10.1364/qels.2011.qtho3

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Decoherence, which causes degradation of entanglement and in some cases entanglement sudden death, is a critical issue faced in quantum information. Protecting entanglement from decoherence, therefore, is essential in practical realization of quantum computing and quantum communication protocols. In this paper, we demonstrate a novel method to protect entanglement from amplitude damping decoherence via weak measurement and quantum measurement reversal. It is shown that even entanglement sudden death can be circumvented.