Loss-tolerant parity measurement for distant quantum bits

Alain Sarlette and Mazyar Mirrahimi
Phys. Rev. A 95, 032329 – Published 27 March 2017

Abstract

We propose a scheme to measure the parity of two distant qubits, while ensuring that losses on the quantum channel between them does not destroy coherences within the parity subspaces. This capability enables deterministic preparation of highly entangled qubit states whose fidelity is not limited by the transmission loss. The key observation is that, for a probe electromagnetic field in a particular quantum state; namely, a superposition of two coherent states of opposite phases, the transmission loss stochastically applies a near-unitary backaction on the probe state. This leads to a parity measurement protocol where the main effect of the transmission losses is a decrease in the measurement strength. By repeating the nondestructive (weak) parity measurement, one achieves a high-fidelity entanglement in spite of a significant transmission loss.

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  • Received 20 April 2016

DOI:https://doi.org/10.1103/PhysRevA.95.032329

©2017 American Physical Society

Physics Subject Headings (PhySH)

General PhysicsQuantum Information, Science & TechnologyAtomic, Molecular & Optical

Authors & Affiliations

Alain Sarlette1,2 and Mazyar Mirrahimi1,3

  • 1QUANTIC project-team, INRIA Paris, France
  • 2Department of Electronics and Information Systems, Ghent University, Belgium
  • 3Yale Quantum Institute, Yale University, USA

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Issue

Vol. 95, Iss. 3 — March 2017

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