Anti-Zeno effect for quantum transport in disordered systems

Keisuke Fujii and Katsuji Yamamoto
Phys. Rev. A 82, 042109 – Published 20 October 2010

Abstract

We demonstrate that repeated measurements in disordered systems can induce a quantum anti-Zeno effect under certain conditions to enhance quantum transport. The enhancement of energy transfer is really exhibited in multisite models under repeated measurements. The optimal measurement interval for the anti-Zeno effect and the maximal efficiency of energy transfer are specified in terms of the relevant physical parameters. Since the environment acts as frequent measurements on the system, the decoherence-induced energy transfer, which has been discussed recently for photosynthetic complexes, may be interpreted in terms of the anti-Zeno effect. We further find an interesting phenomenon in a specific three-site case, where local decoherence or repeated measurements may even promote entanglement generation between the nonlocal sites.

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  • Received 9 March 2010

DOI:https://doi.org/10.1103/PhysRevA.82.042109

©2010 American Physical Society

Authors & Affiliations

Keisuke Fujii and Katsuji Yamamoto

  • Department of Nuclear Engineering, Kyoto University, Kyoto 606-8501, Japan

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Issue

Vol. 82, Iss. 4 — October 2010

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