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Bulletin of the American Physical Society

Eliminating the Purcell Effect in Circuit QED

Matthew Reed, Lev S. Bishop, L. DiCarlo, Luigi Frunzio, Eran Ginossar, Andrew Houck, Blake Johnson, David Schuster, S. M. Girvin, Robert J. Schoelkopf

Published Mar 19, 2010• 0 citations
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We present the use of a set of airbridges to trim the frequency of microwave coplanar-waveguide (CPW) resonators post-fabrication. This method is compatible with the fabrication steps of conventional CPW airbridges and crossovers and increases device yield by allowing compensation of design and fabrication uncertainty with 100 MHz range and 10 MHz resolution. We showcase two applications in circuit QED. The first is the elimination of frequency collisions between resonators intended to readout different transmons by frequency-division multiplexing. The second is frequency matching of readout and Purcell-filter resonator pairs. Combining this matching with transmon frequency trimming by laser annealing reliably achieves fast and high-fidelity readout across 17-transmon quantum processors.