Berlin 2015 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 16: Transport: Quantum coherence and quantum information systems - Experiments (TT with HL)

HL 16.2: Talk

Monday, March 16, 2015, 15:15–15:30, H 0110

Circuit QED with a gradiometric tunable-gap flux qubit — •Frank Deppe^1,2,3, Manuel J. Schwarz^1,2,3, Max Haeberlein^1,2,3, Jan Goetz^1,2,3, Alexander Baust^1,2,3, Peter Eder^1,2,3, Friedrich Wulschner^1,2,3, Edwar Xie^1,2,3, Ling Zhong^1,2,3, Kirill Fedorov^1,2,3, Edwin P. Menzel^1,2,3, Achim Marx^1,2,3, and Rudolf Gross^1,2,3 — ¹Walther-Meißner-Institut, Bayerische Akademie der Wissenschaften, 85748 Garching, Germany — ²Physik-Department, TU München, 85748 Garching, Germany — ³Nanosystems Initiative Munich (NIM), 80799 München, Germany

In circuit quantum electrodynamics or quantum simulation experiments, superconducting quantum bits must combine good coherence with high in situ tunability. Often, a large anharmonicity is also desirable. Other than the popular transmon, the gradiometric tunable-gap flux qubit meets all three of these requirements. Here, we fabricate and characterize such a qubit and demonstrate its first implementation into a transmission line resonator. We show spectroscopy and first time domain results.

This work is supported by the DFG via SFB 631 and the EU projects CCQED and PROMISCE.