Stochastic Resonance Phenomena in Quantum Many-Body Systems

Susana F. Huelga and Martin B. Plenio
Phys. Rev. Lett. 98, 170601 – Published 24 April 2007

Abstract

We discuss stochastic resonance (SR) effects in driven coupled quantum systems. We construct dynamical and information-theoretic measures of the system’s response that exhibit a nonmonotonic behavior as a function of the noise strength. We analyze the relation between lack of monotonicity in the response and the presence of quantum correlations and identify parameter regimes where the breakdown of a linear response can be linked to the presence of entanglement. We also show that a chain of coupled spin systems can exhibit an array-enhanced response, where the sensitivity of a single resonator is enhanced as a result of nearest-neighbor coupling. These results enlarge the domain where SR effects exist and should be observable in arrays of superconducting qubits.

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  • Received 21 August 2006

DOI:https://doi.org/10.1103/PhysRevLett.98.170601

©2007 American Physical Society

Authors & Affiliations

Susana F. Huelga1 and Martin B. Plenio2

  • 1Quantum Physics Group, STRI, School of Physics, Astronomy and Mathematics, University of Hertfordshire, Hatfield, Herts AL10 9AB, United Kingdom
  • 2QOLS, Blackett Laboratory and Institute for Mathematical Sciences, 53 Prince’s Gate, Exhibition Road, Imperial College London, London SW7 2PG, United Kingdom

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Issue

Vol. 98, Iss. 17 — 27 April 2007

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