Cooperative robustness to dephasing: Single-exciton superradiance in a nanoscale ring to model natural light-harvesting systems

G. Luca Celardo, Paolo Poli, Luca Lussardi, and Fausto Borgonovi
Phys. Rev. B 90, 085142 – Published 27 August 2014

Abstract

We analyze a one-dimensional ring structure composed of many two-level systems, in the limit where only one excitation is present. The two-level systems are coupled to a common environment, where the excitation can be lost, which induces super- and subradiant behavior. Moreover, each two-level system is coupled to another independent environment, modeled by a classical white noise, simulating a dephasing bath and described by the Haken-Strobl master equation. Single-exciton superradiance, an example of a cooperative quantum coherent effect, is destroyed at a critical dephasing strength proportional to the system size, showing robustness of cooperativity to the action of the dephasing environment. We also show that the coupling to a common decay channel contrasts with the action of dephasing, driving the entanglement decay to slow down on increasing the system size. Moreover, after a projective measurement which finds the excitation in the system, the entanglement reaches a stationary value, independent of the initial conditions.

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  • Received 28 March 2014
  • Revised 19 July 2014

DOI:https://doi.org/10.1103/PhysRevB.90.085142

©2014 American Physical Society

Authors & Affiliations

G. Luca Celardo1,2,3, Paolo Poli1, Luca Lussardi1, and Fausto Borgonovi1,2,3

  • 1Dipartimento di Matematica e Fisica, Università Cattolica del Sacro Cuore, via Musei 41, I-25121 Brescia, Italy
  • 2Interdisciplinary Laboratories for Advanced Materials Physics, Università Cattolica del Sacro Cuore, via Musei 41, I-25121 Brescia, Italy
  • 3Istituto Nazionale di Fisica Nucleare, Sezione di Pavia, via Bassi 6, I-27100, Pavia, Italy

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Issue

Vol. 90, Iss. 8 — 15 August 2014

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