corner
corner
APS » Journals » Phys. Rev. Lett. » Volume 100 » Issue 24
< Previous Article | Next Article >

Phys. Rev. Lett. 100, 247001 (2008) [4 pages]

High-Fidelity Gates in a Single Josephson Qubit

Download: PDF (423 kB) Buy this article Export: BibTeX or EndNote (RIS)

Erik Lucero1, M. Hofheinz1, M. Ansmann1, Radoslaw C. Bialczak1, N. Katz1,2, Matthew Neeley1, A. D. O’Connell1, H. Wang1, A. N. Cleland1, and John M. Martinis1,*
1Department of Physics, University of California at Santa Barbara, Broida Hall, Santa Barbara, California 93106, USA
2Racah Institute of Physics, Hebrew University of Jerusalem, Jerusalem 91904, Israel

Received 7 February 2008; published 16 June 2008

We demonstrate new experimental procedures for measuring small errors in a superconducting quantum bit (qubit). By carefully separating out gate and measurement errors, we construct a complete error budget and demonstrate single qubit gate fidelities of 0.98, limited by energy relaxation. We also introduce a new metrology tool—a Ramsey interference error filter—that can measure the occupation probability of the state |2⟩, which is outside the computational basis, down to 10-4, thereby confirming that our quantum system stays within the qubit manifold during single qubit logic operations.

© 2008 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.100.247001
DOI:
10.1103/PhysRevLett.100.247001
PACS:
85.25.Cp, 03.67.Lx, 03.67.Pp, 74.50.+r

*martinis@physics.ucsb.edu

 
< Previous Article | Next Article >