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Allman MS, Altomare F, Whittaker JD, et al. rf-SQUID-mediated coherent tunable coupling between a superconducting phase qubit and a lumped-element resonator. Phys Rev Lett. 2010;104(17):177004doi: 10.1103/PhysRevLett.104.177004.
Allman, M. S., Altomare, F., Whittaker, J. D., Cicak, K., Li, D., Sirois, A., Strong, J., Teufel, J. D., & Simmonds, R. W. (2010). rf-SQUID-mediated coherent tunable coupling between a superconducting phase qubit and a lumped-element resonator. Physical review letters, 104(17), 177004. https://doi.org/10.1103/PhysRevLett.104.177004
Allman, M S, et al. "rf-SQUID-mediated coherent tunable coupling between a superconducting phase qubit and a lumped-element resonator." Physical review letters vol. 104,17 (2010): 177004. doi: https://doi.org/10.1103/PhysRevLett.104.177004
Allman MS, Altomare F, Whittaker JD, Cicak K, Li D, Sirois A, Strong J, Teufel JD, Simmonds RW. rf-SQUID-mediated coherent tunable coupling between a superconducting phase qubit and a lumped-element resonator. Phys Rev Lett. 2010 Apr 30;104(17):177004. doi: 10.1103/PhysRevLett.104.177004. Epub 2010 Apr 29. PMID: 20482130.
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Phys Rev Lett. 2010 Apr 30;104(17):177004. doi: 10.1103/PhysRevLett.104.177004. Epub 2010 Apr 29.

rf-SQUID-mediated coherent tunable coupling between a superconducting phase qubit and a lumped-element resonator.

Physical review letters

M S Allman, F Altomare, J D Whittaker, K Cicak, D Li, A Sirois, J Strong, J D Teufel, R W Simmonds

Affiliations

  1. National Institute of Standards and Technology, 325 Broadway, Boulder, Colorado 80305-3328, USA.

PMID: 20482130 DOI: 10.1103/PhysRevLett.104.177004

Abstract

We demonstrate coherent tunable coupling between a superconducting phase qubit and a lumped-element resonator. The coupling strength is mediated by a flux-biased rf SQUID operated in the nonhysteretic regime. By tuning the applied flux bias to the rf SQUID we change the effective mutual inductance, and thus the coupling energy, between the phase qubit and resonator. We verify the modulation of coupling strength from 0 to 100 MHz by observing modulation in the size of the splitting in the phase qubit's spectroscopy, as well as coherently by observing modulation in the vacuum Rabi oscillation frequency when on resonance. The measured spectroscopic splittings and vacuum Rabi oscillations agree well with theoretical predictions.

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