Approaching Unit Visibility for Control of a Superconducting Qubit with Dispersive Readout

A. Wallraff, D. I. Schuster, A. Blais, L. Frunzio, J. Majer, M. H. Devoret, S. M. Girvin, and R. J. Schoelkopf
Phys. Rev. Lett. 95, 060501 – Published 1 August 2005

Abstract

In a Rabi oscillation experiment with a superconducting qubit we show that a visibility in the qubit excited state population of more than 95% can be attained. We perform a dispersive measurement of the qubit state by coupling the qubit nonresonantly to a transmission line resonator and probing the resonator transmission spectrum. The measurement process is well characterized and quantitatively understood. In a measurement of Ramsey fringes, the qubit coherence time is larger than 500 ns.

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  • Received 27 February 2005

DOI:https://doi.org/10.1103/PhysRevLett.95.060501

©2005 American Physical Society

Authors & Affiliations

A. Wallraff, D. I. Schuster, A. Blais, L. Frunzio, J. Majer, M. H. Devoret, S. M. Girvin, and R. J. Schoelkopf

  • Departments of Applied Physics and Physics, Yale University, New Haven, Connecticut 06520, USA

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Issue

Vol. 95, Iss. 6 — 5 August 2005

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