Dresden 2014 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 30: Superconductivity - Poster Session
TT 30.52: Poster
Monday, March 31, 2014, 15:00–19:00, P2
Squeezing physics and path entanglement of continuous-variable propagating microwaves — •E. P. Menzel1, L. Zhong1, R. Di Candia3, P. Eder1,2, M. Ihmig4, A. Baust1, M. Haeberlein1,2, C. Schneider1,2, K. Inomata5, T. Yamamoto5,6, Y. Nakamura5,7, E. Solano3, F. Deppe1,2, A. Marx1, and R. Gross1,2 — 1Walther-Meißner-Institut, Bayerische Akademie der Wissenschaften, Garching, Germany — 2Physik-Department, TU München, Garching, Germany — 3University of the Basque Country UPV/EHU and IKERBASQUE Foundation, Bilbao, Spain — 4TU München, Germany — 5RIKEN Center for Emergent Matter Science, Japan — 6NEC Smart Energy Research Laboratories, Japan — 7The University of Tokyo, Japan
Josephson parametric amplifiers (JPA) have recently become promising devices in circuit quantum electrodynamics. We report on the detailed characterization of a flux-driven JPA at millikelvin temperatures and investigate its squeezing properties by two different detection techniques. By superimposing a squeezed vacuum and a vacuum state on a microwave beam splitter, we demonstrate a frequency-degenerate, continuous-variable path entanglement, which constitutes an essential resource in quantum information and communication protocols.
This work is supported by DFG via SFB 631, German Excellence Initiative via NIM, EU projects SOLID, CCQED, PROMISCE and SCALEQIT, MEXT Kakenhi “Quantum Cybernetics”, JSPS FIRST Program, the NICT Commissioned Research, Basque Government IT472-10, Spanish MINECO FIS2012-36673-C03-02, and UPV/EHU UFI 11/55.