Berlin 2015 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 103: Transport: Poster Session
TT 103.29: Poster
Donnerstag, 19. März 2015, 15:00–18:00, Poster B
Circuit QED with transmon qubits — •Karl Friedrich Wulschner1,2,3, Javier Puertas1,2,3, Alexander Baust1,2,3, Peter Eder1,2,3, Michael Fischer1,2,3, Jan Goetz1,2,3, Max Haeberlein1,2,3, Manuel Schwarz1,2,3, Edwar Xie1,2,3, Ling Zhong1,2,3, Frank Deppe1,2,3, Kirill Fedorov1,2,3, Hans Hübl1,3, Achim Marx1,2,3, Edwin Menzel1,2,3, Martin Weides4, and Rudolf Gross1,2,3 — 1Walther-Meißner-Institut, Bayerische Akademie der Wissenschaften, 85748 Garching, Germany — 2Physik-Department, TU München, 85748 Garching, Germany — 3Nanosystems Initiative Munich (NIM), 80799 München, Germany — 4Karlsruhe Institute of Technology (KIT), 76131 Karlsruhe, Germany
Superconducting quantum bits are basic building blocks for circuit QED systems. Applications in the fields of quantum computation and quantum simulation require long coherence times. We have fabricated and characterized superconducting transmon qubits which are designed to operate at a high ratio of Josephson energy and charging energy. Due to their low sensitivity to charge noise transmon qubits show good coherence properties. We couple transmon qubits to coplanar waveguide resonators and coplanar slotline resonators and characterize the devices at mK-temperatures. From the experimental data we derive the qubit-resonator coupling strength, the qubit relaxation time and calibrate the photon number in the resonator via Stark shifts.
This work is supported by the DFG via SFB 631 and the EU projects CCQED and PROMISCE.