Observation of Quantum Oscillations between a Josephson Phase Qubit and a Microscopic Resonator using Fast Readout

Published

October 25, 2004

Author(s)

Ken Cooper, Matthias Steffen, Robert McDermott, Raymond Simmonds, Seongshik Oh, Dustin Hite, David P. Pappas, John M. Martinis

Abstract

We have detected coherent quantum oscillations between Josephson phase qubits and microscopic critical current fluctuators by implementing a new state readout technique that is an order of magnitude faster than previous methods. The period of the oscillations is consistent with the spectroscopic splittings observed in the qubit's resonant frequency. The results point to a possible mechanism for decoherence and reduced measurement fidelity in superconducting qubits, and they demonstrate the means to measure two-qubit interactions in the time domain.

Citation

Physical Review Letters

Volume

93

Issue

18

Pub Type

Journals

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Keywords

coherent oscillation, fast readout, Josephson junction, phase qubit, quantum computing, qubit, superconductivity

Citation

Cooper, K. , Steffen, M. , Mcdermott, R. , Simmonds, R. , Oh, S. , Hite, D. , Pappas, D. and Martinis, J. (2004), Observation of Quantum Oscillations between a Josephson Phase Qubit and a Microscopic Resonator using Fast Readout, Physical Review Letters, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=31713 (Accessed October 21, 2025)