Coupled-qubit Tavis-Cummings scheme for prolonging quantum coherence

Amrit De
Phys. Rev. A 91, 012317 – Published 13 January 2015

Abstract

Qubit-qubit interactions can significantly boost quantum coherence times for Bell states. The coherence-time enhancements are, however, not monotonic and there exists a phase where further increasing the interaction is unhelpful. A resonator in a suggested circuit QED-type implementation of the Tavis-Cummings (Dicke) model, is shown to shift this transition point depending on the number of loaded photons. This allows the resonator to amplify the coherence enhancements in certain regimes. The interactions also induce unusual collapse and revival-type behavior for the entanglement dynamics. An exact open quantum system's formalism–(quasi-Hamiltonians for the Dicke model) shows how a Bell state singlet-triplet qubit in a resonator can be protected against 1/f noise from randomly fluctuating two-level systems. Simple circuit level details are given for flux qubits.

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  • Received 25 October 2013
  • Revised 29 September 2014

DOI:https://doi.org/10.1103/PhysRevA.91.012317

©2015 American Physical Society

Authors & Affiliations

Amrit De

  • Department of Physics and Astronomy, University of California, Riverside, California 92521, USA

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Issue

Vol. 91, Iss. 1 — January 2015

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