期刊
PHYSICAL REVIEW LETTERS
卷 109, 期 5, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.109.050507
关键词
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资金
- Dutch Organization for Fundamental Research on Matter (FOM)
- the Netherlands Organization for Scientific Research (NWO) [680-47-508]
- EU FP7 project SOLID
- DARPA QuEST program
We demonstrate initialization by joint measurement of two transmon qubits in 3D circuit quantum electrodynamics. Homodyne detection of cavity transmission is enhanced by Josephson parametric amplification to discriminate the two-qubit ground state from single-qubit excitations nondestructively and with 98.1% fidelity. Measurement and postselection of a steady-state mixture with 4.7% residual excitation per qubit achieve 98.8% fidelity to the ground state, thus outperforming passive initialization.
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