Superconducting Qubit with Purcell Protection and Tunable Coupling

被引：110

作者：

Gambetta, J. M. ^{[1
,2
]}

Houck, A. A. ^{[3
]}

Blais, Alexandre ^{[4
]}

机构：

[1] Univ Waterloo, Inst Quantum Comp, Waterloo, ON N2L 3G1, Canada

[2] Univ Waterloo, Dept Appl Math, Waterloo, ON N2L 3G1, Canada

[3] Princeton Univ, Dept Elect Engn, Princeton, NJ 08544 USA

[4] Univ Sherbrooke, Dept Phys, Sherbrooke, PQ J1K 2R1, Canada

来源：

PHYSICAL REVIEW LETTERS | 2011年 / 106卷 / 03期

基金：

加拿大自然科学与工程研究理事会;

关键词：

QUANTUM; STATE; ENTANGLEMENT;

D O I：

10.1103/PhysRevLett.106.030502

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We present a superconducting qubit for the circuit quantum electrodynamics architecture that has a tunable qubit-resonator coupling strength g. This coupling can be tuned from zero to values that are comparable with other superconducting qubits. At g = 0, the qubit is in a decoherence-free subspace with respect to spontaneous emission induced by the Purcell effect. Furthermore, we show that in this decoherence-free subspace, the state of the qubit can still be measured by either a dispersive shift on the resonance frequency of the resonator or by a cycling-type measurement.

引用

页数：4

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