Regensburg 2007 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 28: Transport - Poster Session

TT 28.18: Poster

Thursday, March 29, 2007, 14:00–17:45, Poster A

Superconducting microstrip transmission line resonator for flux qubit readout — •Thomas Niemczyk, Susanne Hofmann, Achim Marx, and Rudolf Gross — Walther-Meissner-Institut für Tieftemperaturforschung, Bayerischen Akademie der Wissenschaften, Walther-Meissner Str. 8, 85748 Garching, Deutschland

Coupling superconducting quantum bits to high-quality superconducting resonators opens the fascinating field of cavity quantum electrodynamics (cQED) based on superconducting circuits. Exciting first experiments have recently been performed in Yale [1] with superconducting charge qubits. For cQED experiments using superconducting flux qubits strong coupling between the magnetic field in a suitable resonator and the flux in the qubit is required. We present the design and realization of a high-Q superconducting microstrip resonator for application in c-QED. The resonator is based on the microstrip SQUID amplifier introduced by Mück et al. [2]. We will introduce the fundamental mode of operation of the microstrip resonator and discuss the results of extended simulations of the device parameters and performance. The geometry of the device should allow for a strong qubit-cavity-coupling up to 200 MHz. A first series of superconducting microstrip resonators has been fabricated by Hypres, Inc. We will present the experimental characterization of the S-parameters of various resonators with different resonance frequency and external coupling capacitors.

[1] A. Wallraff et al. Nature 431, 162 (2004).

[2] M. Mück and J. Clarke, J. Appl. Phys. 88, 6910 (2000)

This work is supported by the DFG via SFB 631.