High-fidelity gates in a single josephson qubit

Erik Lucero*, M. Hofheinz, M. Ansmann, Radoslaw C. Bialczak, N. Katz, Matthew Neeley, A. D. O'Connell, H. Wang, A. N. Cleland, John M. Martinis

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

100 Scopus citations


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, 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.

Original languageAmerican English
Article number247001
JournalPhysical Review Letters
Issue number24
StatePublished - 16 Jun 2008


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