Path Entanglement of Continuous-Variable Quantum Microwaves

E. P. Menzel, R. Di Candia, F. Deppe, P. Eder, L. Zhong, M. Ihmig, M. Haeberlein, A. Baust, E. Hoffmann, D. Ballester, K. Inomata, T. Yamamoto, Y. Nakamura, E. Solano, A. Marx, and R. Gross
Phys. Rev. Lett. 109, 250502 – Published 18 December 2012
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Abstract

Path entanglement constitutes an essential resource in quantum information and communication protocols. Here, we demonstrate frequency-degenerate entanglement between continuous-variable quantum microwaves propagating along two spatially separated paths. We combine a squeezed and a vacuum state using a microwave beam splitter. Via correlation measurements, we detect and quantify the path entanglement contained in the beam splitter output state. Our experiments open the avenue to quantum teleportation, quantum communication, or quantum radar with continuous variables at microwave frequencies.

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  • Received 8 October 2012

DOI:https://doi.org/10.1103/PhysRevLett.109.250502

© 2012 American Physical Society

Authors & Affiliations

E. P. Menzel1,2,*, R. Di Candia3, F. Deppe1,2, P. Eder1,2, L. Zhong1,2, M. Ihmig4, M. Haeberlein1,2, A. Baust1,2, E. Hoffmann1,2, D. Ballester5,3, K. Inomata6, T. Yamamoto7,6, Y. Nakamura8,6, E. Solano3,9, A. Marx1, and R. Gross1,2

  • 1Walther-Meißner-Institut, Bayerische Akademie der Wissenschaften, D-85748 Garching, Germany
  • 2Physik-Department, Technische Universität München, D-85748 Garching, Germany
  • 3Departamento de Química Física, Universidad del País Vasco UPV/EHU, Apartado 644, 48080 Bilbao, Spain
  • 4Lehrstuhl für Integrierte Systeme, Technische Universität München, D-80333 München, Germany
  • 5Department of Physics and Astronomy, University College London, London WC1E 6BT, United Kingdom
  • 6RIKEN Advanced Science Institute, Wako, Saitama 351-0198, Japan
  • 7NEC Smart Energy Research Laboratories, Tsukuba, Ibaraki 305-8501, Japan
  • 8Research Center for Advanced Science and Technology (RCAST), The University of Tokyo, Komaba, Meguro-ku, Tokyo 153-8904, Japan
  • 9IKERBASQUE, Basque Foundation for Science, Alameda Urquijo 36, 48011 Bilbao, Spain

  • *Edwin.Menzel@wmi.badw-muenchen.de

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Issue

Vol. 109, Iss. 25 — 21 December 2012

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