State tomography of capacitively shunted phase qubits with high fidelity

被引：165

作者：

Steffen, Matthias ^{[1
]}

Ansmann, M.

McDermott, R.

Katz, N.

Bialczak, Radoslaw C.

Lucero, Erik

Neeley, Matthew

Weig, E. M.

Cleland, A. N.

Martinis, John M.

机构：

[1] Univ Calif Santa Barbara, Dept Phys, Santa Barbara, CA 93106 USA

[2] Univ Calif Santa Barbara, Calif Nanosyst Inst, Santa Barbara, CA 93106 USA

来源：

PHYSICAL REVIEW LETTERS | 2006年 / 97卷 / 05期

关键词：

D O I：

10.1103/PhysRevLett.97.050502

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

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.

引用

页数：4

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