Observation of quantum oscillations between a Josephson phase qubit and a microscopic resonator using fast readout

We have detected coherent quantum oscillations between Josephson phase qubits and critical-current fluctuators by implementing a new state readout technique that is an order of magnitude faster than previous methods. These results reveal a new aspect of the quantum behavior of Josephson junctions, a...

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Published inPhysical review letters Vol. 93; no. 18; p. 180401
Main Authors Cooper, K B, Steffen, Matthias, McDermott, R, Simmonds, R W, Oh, Seongshik, Hite, D A, Pappas, D P, Martinis, John M
Format Journal Article
LanguageEnglish
Published United States 29.10.2004
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Summary:We have detected coherent quantum oscillations between Josephson phase qubits and critical-current fluctuators by implementing a new state readout technique that is an order of magnitude faster than previous methods. These results reveal a new aspect of the quantum behavior of Josephson junctions, and they demonstrate the means to measure two-qubit interactions in the time domain. The junction-fluctuator interaction also points to a possible mechanism for decoherence and reduced fidelity in superconducting qubits.
ISSN:0031-9007
DOI:10.1103/physrevlett.93.180401