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860 IEEE TRANSACTIONS ON APPLIED …

860 ieee TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY, VOL. 15, NO. 2, JUNE 2005 Fabrication and Characterization of SuperconductingCircuit QED Devices for Quantum ComputationLuigi Frunzio, Andreas Wallraff, David Schuster, Johannes Majer, and Robert SchoelkopfAbstract We present fabrication and characterization proce-dures of devices for circuit quantum electrodynamics (cQED).We have made 3-GHz cavities with quality factors in the range104 106, which allow access to the strong coupling regime ofcQED. The cavities are transmission line resonators made byphotolithography. They are coupled to the input and output portsvia gap capacitors. An Al-based Cooper pair box is made bye-beam lithography and Dolan bridge double-angle evaporationin superconducting resonators with high quality factor.

862 IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY, VOL. 15, NO. 2, JUNE 2005 Fig. 2. Picture of the copper sample box containing a resonator mounted on the PC board. Fig. 3. Measured transmission power spectrum of an undercoupled resonator. The solid line is a fit to a Lorentzian line.

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