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
DOI 10.1103/PhysRevLett.100.247001 · Physical Review Letters
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Abstract
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.
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