Displacement of Propagating Squeezed Microwave States

Kirill G. Fedorov, L. Zhong, S. Pogorzalek, P. Eder, M. Fischer, J. Goetz, E. Xie, F. Wulschner, K. Inomata, T. Yamamoto, Y. Nakamura, R. Di Candia, U. Las Heras, M. Sanz, E. Solano, E. P. Menzel, F. Deppe, A. Marx, and R. Gross

Phys. Rev. Lett. 117, 020502 – Published 7 July 2016

Abstract

Displacement of propagating quantum states of light is a fundamental operation for quantum communication. It enables fundamental studies on macroscopic quantum coherence and plays an important role in quantum teleportation protocols with continuous variables. In our experiments, we have successfully implemented this operation for propagating squeezed microwave states. We demonstrate that, even for strong displacement amplitudes, there is no degradation of the squeezing level in the reconstructed quantum states. Furthermore, we confirm that path entanglement generated by using displaced squeezed states remains constant over a wide range of the displacement power.

Received 15 February 2016

DOI:https://doi.org/10.1103/PhysRevLett.117.020502

Physics Subject Headings (PhySH)

Quantum communication Quantum computation Quantum information processing Quantum state engineering Squeezing of quantum noise Superconducting qubits Superconductivity

Microwave techniques

Quantum Information, Science & TechnologyGravitation, Cosmology & AstrophysicsAtomic, Molecular & Optical

Authors & Affiliations

Kirill G. Fedorov^1,*, L. Zhong^1,2,3, S. Pogorzalek^1,2, P. Eder^1,2,3, M. Fischer^1,2, J. Goetz^1,2, E. Xie^1,2,3, F. Wulschner^1,2, K. Inomata⁶, T. Yamamoto⁷, Y. Nakamura^6,8, R. Di Candia⁴, U. Las Heras⁴, M. Sanz⁴, E. Solano^2,4,5, E. P. Menzel¹, F. Deppe^1,2,3, A. Marx¹, and R. Gross^1,2,3,†

¹Walther-Meißner-Institut, Bayerische Akademie der Wissenschaften, D-85748 Garching, Germany
²Physik-Department, Technische Universität München, D-85748 Garching, Germany
³Nanosystems Initiative Munich (NIM), Schellingstraße 4, 80799 München, Germany
⁴Department of Physical Chemistry, University of the Basque Country UPV/EHU, Apartado 644, E-48080 Bilbao, Spain
⁵IKERBASQUE, Basque Foundation for Science, Maria Diaz de Haro 3, 48013 Bilbao, Spain
⁶RIKEN Center for Emergent Matter Science (CEMS), Wako, Saitama 351-0198, Japan
⁷NEC IoT Device Research Laboratories, Tsukuba, Ibaraki 305-8501, Japan
⁸Research Center for Advanced Science and Technology (RCAST), The University of Tokyo, Meguro-ku, Tokyo 153-8904, Japan

^*kirill.fedorov@wmi.badw.de
^†rudolf.gross@wmi.badw.de

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Issue

Vol. 117, Iss. 2 — 8 July 2016

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