Detecting highly entangled states with a joint qubit readout

被引：85

作者：

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

DiCarlo, L. ^{[1
,2
]}

Gambetta, J. M. ^{[3
,4
]}

Nunnenkamp, A. ^{[1
,2
]}

Bishop, Lev S. ^{[1
,2
]}

Frunzio, L. ^{[1
,2
]}

Devoret, M. H. ^{[1
,2
]}

Girvin, S. M. ^{[1
,2
]}

Schoelkopf, R. J. ^{[1
,2
]}

机构：

[1] Yale Univ, Dept Phys, New Haven, CT 06520 USA

[2] Yale Univ, Dept Appl Phys, New Haven, CT 06520 USA

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

[4] Univ Waterloo, Dept Phys & Astron, Waterloo, ON N2L 3G1, Canada

来源：

PHYSICAL REVIEW A | 2010年 / 81卷 / 06期

基金：

加拿大自然科学与工程研究理事会;

关键词：

SUPERCONDUCTING QUBITS; QUANTUM; PHOTON;

D O I：

10.1103/PhysRevA.81.062325

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

A single-channel joint readout is used to analyze highly entangled two-qubit states in a circuit quantum electrodynamics architecture. The measurement model for the readout is fully characterized, demonstrating a large sensitivity to two-qubit correlations. We quantify the high degree of entanglement by measuring a violation of the Clauser-Horne-Shimony-Holt inequality with a value of 2.61 +/- 0.04, without optimizing the preparation of the two-qubit state. In its present form, this joint readout can resolve improvements to the fidelity of two-qubit operations and be extended to three or four qubits.

引用

页数：8

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