期刊
PHYSICAL REVIEW A
卷 81, 期 6, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevA.81.062325
关键词
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资金
- LPS/NSA under ARO [W911NF-05-1-0365]
- NSF [DMR-0653377, DMR-0603369]
- CIFAR
- MITACS
- MRI
- NSERC
- CNR-Istituto di Cibernetica, Pozzuoli, Italy
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.
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