State tomography of capacitively shunted phase qubits with high fidelity |
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| Authors: | Steffen Matthias Ansmann M McDermott R Katz N Bialczak Radoslaw C Lucero Erik Neeley Matthew Weig E M Cleland A N Martinis John M |
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| Institution: | Department of Physics and California Nanosystems Institute, University of California, Santa Barbara, CA 93106, USA. |
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| Abstract: | We introduce a new design concept for superconducting phase quantum bits (qubits) in which we explicitly separate the capacitive element from the Josephson tunnel junction for improved qubit performance. The number of two-level systems that couple to the qubit is thereby reduced by an order of magnitude and the measurement fidelity improves to 90%. This improved design enables the first demonstration of quantum state tomography with superconducting qubits using single-shot measurements. |
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