Suppression of photon shot noise dephasing in a tunable coupling superconducting qubit

Gengyan Zhang, Yanbing Liu, James J. Raftery, Andrew A. Houck

Research output: Contribution to journalArticlepeer-review

17 Scopus citations

Abstract

We demonstrate the suppression of photon shot noise dephasing in a superconducting qubit by eliminating its dispersive coupling to the readout cavity. This is achieved in a tunable coupling qubit, where the qubit frequency and coupling rate can be controlled independently. We observe that the coherence time approaches twice the relaxation time and becomes less sensitive to thermal photon noise when the dispersive coupling rate is tuned from several MHz to 22 kHz. This work provides a promising building block in circuit quantum electrodynamics that can hold high coherence and be integrated into larger systems.

Original languageEnglish (US)
Article number1
Journalnpj Quantum Information
Volume3
Issue number1
DOIs
StatePublished - Dec 1 2017

All Science Journal Classification (ASJC) codes

  • Computer Science (miscellaneous)
  • Statistical and Nonlinear Physics
  • Computer Networks and Communications
  • Computational Theory and Mathematics

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