Dresden 2014 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 5: Transport: Quantum Coherence and Quantum Information Systems - Experiment
TT 5.3: Vortrag
Montag, 31. März 2014, 10:00–10:15, HSZ 204
Squeezing with a flux-driven Josephson parametric amplifier — •L. Zhong1, E. P. Menzel1, R. Di Candia3, P. Eder1,2, M. Ihmig4, A. Baust1, M. Haeberlein1,2, 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) are promising devices for continuous-variable quantum communication. In phase-sensitive mode, JPAs can beat the standard quantum limit for the added noise of phase-insensitive amplifiers. This property is a prerequisite for the generation of squeezed states. Here, we reconstruct the Wigner function of squeezed vacuum and thermal states with the dual-path method [1,2]. In addition, we illuminate the physics of propagating squeezed coherent microwave fields.
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.
L. Zhong et al., arXiv:1307.7285 (2013)
E. P. Menzel et al., PRL 109 (2012) 250502