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Bulletin of the American Physical Society

Decoherence-free subspaces and spontaneous emission cancellation: necessity of Dicke limit

Karl-Peter Marzlin, Raisa I. Karasik, Barry C. Sanders, K. Birgitta Whaley

Published May 20, 2006• 0 citations
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We present a superconducting qubit for the circuit quantum electrodynamics architecture that has a tunable qubit-resonator coupling strength g. This coupling can be tuned from zero to values that are comparable with other superconducting qubits. At g = 0, the qubit is in a decoherence-free subspace with respect to spontaneous emission induced by the Purcell effect. Furthermore, we show that in this decoherence-free subspace, the state of the qubit can still be measured by either a dispersive shift on the resonance frequency of the resonator or by a cycling-type measurement.