State tomography of capacitively shunted phase qubits with high fidelity

Matthias Steffen; M. Ansmann; R. McDermott; N. Katz; Radoslaw C. Bialczak; Erik Lucero; Matthew Neeley; E. M. Weig; A. N. Cleland; John M. Martinis

doi:10.1103/PhysRevLett.97.050502

State tomography of capacitively shunted phase qubits with high fidelity

Matthias Steffen^*, M. Ansmann, R. McDermott, N. Katz, Radoslaw C. Bialczak, Erik Lucero, Matthew Neeley, E. M. Weig, A. N. Cleland, John M. Martinis

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

175 Scopus citations

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.

Original language	English
Article number	050502
Journal	Physical Review Letters
Volume	97
Issue number	5
DOIs	https://doi.org/10.1103/PhysRevLett.97.050502
State	Published - 2006
Externally published	Yes

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10.1103/PhysRevLett.97.050502

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State tomography of capacitively shunted phase qubits with high fidelity

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