Collisional-model quantum trajectories for entangled-qubit environments

Shakib Daryanoosh, Alexei Gilchrist, and Ben Q. Baragiola
Phys. Rev. A 106, 022202 – Published 3 August 2022

Abstract

We study the dynamics of quantum systems interacting with a stream of entangled-qubit pairs in the weak coupling limit. For a large class of two-qubit bath states, we present a detailed framework describing conditional dynamical maps for the system, known as quantum trajectories, that arise when the qubits are measured. Depending on the measurement basis, these quantum trajectories can be jump-type or diffusive-type, and can successively transfer entanglement from the bath qubits other quantum systems. They also exhibit features not present in standard quantum optical trajectories due to the fact that collisional models are not confined by the standard white-noise limit for optical-mode baths. As an example of this formalism, we consider the case of two remote two-level systems, where jump-type quantum trajectories herald the birth and death of entanglement.

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  • Received 6 March 2022
  • Revised 18 May 2022
  • Accepted 21 July 2022

DOI:https://doi.org/10.1103/PhysRevA.106.022202

©2022 American Physical Society

Physics Subject Headings (PhySH)

Atomic, Molecular & Optical

Authors & Affiliations

Shakib Daryanoosh1,2,3,*, Alexei Gilchrist1, and Ben Q. Baragiola1,4,5

  • 1Centre for Engineered Quantum Systems, Department of Physics and Astronomy, Macquarie University, Sydney, NSW 2122, Australia
  • 2Department of Physics, University of Oxford, Clarendon Laboratory, Parks Road, Oxford OX1 3PU, United Kingdom
  • 3Department of Physics, University of Western Australia, Crawley, WA 6009, Australia
  • 4Center for Gravitational Physics and Quantum Information (CGPQI), Yukawa Institute for Theoretical Physics, Kyoto University, Kitashirakawa Oiwakecho, Sakyo-ku, Kyoto 606-8502, Japan
  • 5Centre for Quantum Computation and Communication Technology, School of Science, RMIT University, Melbourne, Victoria 3001, Australia

  • *shakib.daryanoosh@uwa.edu.au

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Issue

Vol. 106, Iss. 2 — August 2022

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