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Superconducting qubit with purcell protection and tunable coupling

Author(s): Gambetta, JM; Houck, Andrew A; Blais, A

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Abstract: 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.
Publication Date: 2011
Citation: Gambetta, JM, Houck, AA, Blais, A. (2011). Superconducting qubit with purcell protection and tunable coupling. Physical Review Letters, 106 (10.1103/PhysRevLett.106.030502
DOI: doi:10.1103/PhysRevLett.106.030502
Type of Material: Journal Article
Journal/Proceeding Title: Physical Review Letters
Version: Author's manuscript

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