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.
Original language | English (US) |
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Article number | 030502 |
Journal | Physical review letters |
Volume | 106 |
Issue number | 3 |
DOIs | |
State | Published - Jan 20 2011 |
All Science Journal Classification (ASJC) codes
- General Physics and Astronomy