TY - JOUR
T1 - High-fidelity gates in a single josephson qubit
AU - Lucero, Erik
AU - Hofheinz, M.
AU - Ansmann, M.
AU - Bialczak, Radoslaw C.
AU - Katz, N.
AU - Neeley, Matthew
AU - O'Connell, A. D.
AU - Wang, H.
AU - Cleland, A. N.
AU - Martinis, John M.
PY - 2008/6/16
Y1 - 2008/6/16
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=45249114433&partnerID=8YFLogxK
U2 - 10.1103/PhysRevLett.100.247001
DO - 10.1103/PhysRevLett.100.247001
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AN - SCOPUS:45249114433
SN - 0031-9007
VL - 100
JO - Physical Review Letters
JF - Physical Review Letters
IS - 24
M1 - 247001
ER -