Entanglement, coherence, and redistribution of quantum resources in double spontaneous down-conversion processes

David Edward Bruschi, Carlos Sabín, and Gheorghe Sorin Paraoanu
Phys. Rev. A 95, 062324 – Published 16 June 2017

Abstract

We study the properties of bisqueezed tripartite Gaussian states created by two spontaneous parametric down-conversion processes that share a common idler. We give a complete description of the quantum correlations across all partitions, as well as of the genuine multipartite entanglement, obtaining analytical expressions for most of the quantities of interest. We find that the state contains genuine tripartite entanglement, in addition to the bipartite entanglement among the modes that are directly squeezed. We also investigate the effect of homodyne detection of the photons in the common idler mode, and analyze the final reduced state of the remaining two signal modes. We find that this measurement leads to a conversion of the coherence of the two signal modes into entanglement, a phenomenon that can be regarded as a redistribution of quantum resources between the modes. The applications of these results to quantum optics and circuit quantum electrodynamics platforms are also discussed.

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  • Received 28 July 2016

DOI:https://doi.org/10.1103/PhysRevA.95.062324

©2017 American Physical Society

Physics Subject Headings (PhySH)

Quantum Information, Science & Technology

Authors & Affiliations

David Edward Bruschi1, Carlos Sabín2, and Gheorghe Sorin Paraoanu3

  • 1York Centre for Quantum Technologies, Department of Physics, University of York, YO10 5DD Heslington, United Kingdom
  • 2Instituto de Física Fundamental (CSIC), Serrano 113-bis, 28006 Madrid, Spain
  • 3Low Temperature Laboratory and Centre for Quantum Engineering, Department of Applied Physics, Aalto University School of Science, FI-00076 Aalto, Finland

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Issue

Vol. 95, Iss. 6 — June 2017

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