Quantum teleportation with continuous measurements

Eliska Greplova, Klaus Mølmer, and Christian Kraglund Andersen
Phys. Rev. A 94, 042334 – Published 21 October 2016

Abstract

We propose a scheme for quantum teleportation between two qubits, coupled sequentially to a cavity field. An implementation of the scheme is analyzed with superconducting qubits and a transmission line resonator, where measurements are restricted to continuous probing of the field leaking from the resonator rather than instantaneous projective Bell state measurement. We show that the past quantum state formalism S. Gammelmark, B. Julsgaard, and K. Mølmer, Phys. Rev. Lett. 111, 160401 (2013) can be successfully applied to estimate what would have been the most likely Bell measurement outcome conditioned on our continuous signal record. This information determines which local operation on the target qubit yields the optimal teleportation fidelity. Our results emphasize the significance of applying a detailed analysis of quantum measurements in feedforward protocols in nonideal leaky quantum systems.

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  • Received 11 August 2016

DOI:https://doi.org/10.1103/PhysRevA.94.042334

©2016 American Physical Society

Physics Subject Headings (PhySH)

Atomic, Molecular & OpticalQuantum Information, Science & Technology

Authors & Affiliations

Eliska Greplova*, Klaus Mølmer, and Christian Kraglund Andersen

  • Department of Physics and Astronomy, Aarhus University, DK-8000 Aarhus C, Denmark

  • *eliska.greplova@phys.au.dk
  • moelmer@phys.au.dk
  • ctc@phys.au.dk

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Issue

Vol. 94, Iss. 4 — October 2016

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