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Phys Rev Lett. 2004 Oct 29;93(18):180401. Epub 2004 Oct 25.

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

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  • 1National Institute of Standards and Technology, 325 Broadway, Boulder, CO 80305, USA.


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.

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