Proposal for generating and detecting multi-qubit GHZ states in circuit QED

被引：63

作者：

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

Tornberg, L. ^{[3
]}

Price, D. ^{[1
,2
]}

Ginossar, E. ^{[1
,2
]}

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

Houck, A. A. ^{[4
]}

Gambetta, J. M. ^{[5
,6
]}

Koch, Jens ^{[1
,2
]}

Johansson, G. ^{[3
]}

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] Chalmers, Dept Microtechnol & Nanosci MC2, SE-41296 Gothenburg, Sweden

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

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

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

来源：

NEW JOURNAL OF PHYSICS | 2009年 / 11卷

基金：

瑞典研究理事会;

关键词：

HORNE-ZEILINGER ENTANGLEMENT; SUPERCONDUCTING QUBITS; QUANTUM ENTANGLEMENT; LOCAL THEORIES; TOMOGRAPHY; PHOTON; CAVITY;

D O I：

10.1088/1367-2630/11/7/073040

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We propose methods for the preparation and entanglement detection of multi-qubit Greenberger-Horne-Zeilinger (GHZ) states in circuit quantum electrodynamics. Using quantum trajectory simulations appropriate for the situation of a weak continuous measurement, we show that the joint dispersive readout of several qubits can be utilized for the probabilistic production of high-fidelity GHZ states. When employing a nonlinear filter on the recorded homodyne signal, the selected states are found to exhibit values of the Bell-Mermin operator exceeding 2 under realistic conditions. We discuss the potential of the dispersive readout to demonstrate a violation of the Mermin bound, and present a measurement scheme avoiding the necessity for full detector tomography.

引用

页数：16

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