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TT: Fachverband Tiefe Temperaturen

TT 29: Poster Session: Quantum Information Systems, Quantum Coherence (jointly with SAMOP)

TT 29.8: Poster

Tuesday, March 15, 2011, 18:00–21:00, P1

Characterization of flux-driven Josephson parametric amplifiers — •Alexander Baust¹, Edwin P. Menzel¹, Thomas Niemczyk¹, Elisabeth Hoffmann¹, Max Haeberlein¹, Friedrich Wulschner¹, Frank Deppe¹, Achim Marx¹, Rudolf Gross¹, Enrique Solano², Kunihiro Inomata³, Tsuyoshi Yamamoto^3,4, and Yasunobu Nakamura^3,4 — ¹Walther-Meissner-Institut and TU München, Garching, Germany — ²Universidad del Pais Vasco and Ikerbasque Foundation, Bilbao, Spain — ³RIKEN, Wako-shi, Japan — ⁴NEC Corporation, Tsukuba, Japan

Phase sensitive linear amplifiers receive increasing interest for applications in the field of circuit QED as they allow for the amplification of one signal quadrature without, in principle, adding noise. The flux-driven Josephson parametric amplifier characterized in this work is formed by a SQUID-terminated transmission line resonator with resonant frequency that can be varied by applying an ac magnetic flux signal through the SQUID. We have characterized two Josephson parametric amplifiers with different design parameters with respect to the center frequency and quality factor of the resonator, phase-dependent and phase-independent gains, as well as compression points and bandwidths.

This work is supported by SFB 631, NIM, Basque Government IT4720-10, Spanish MICINN FIS2009-12773-C02-01, and EU project SOLID.