期刊
SCIENCE
卷 361, 期 6408, 页码 1239-+出版社
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.aat4625
关键词
-
资金
- U.S. Government under ARO [W911NF-14-1-0080, W911NF-15-1-0248]
Fast, high-fidelity measurement is a key ingredient for quantum error correction. Conventional approaches to the measurement of superconducting qubits, involving linear amplification of a microwave probe tone followed by heterodyne detection at room temperature, do not scale well to large system sizes. We introduce an approach to measurement based on a microwave photon counter demonstrating raw single-shot measurement fidelity of 92%. Moreover, the intrinsic damping of the photon counter is used to extract the energy released by the measurement process, allowing repeated high-fidelity quantum nondemolition measurements. Our scheme provides access to the classical outcome of projective quantum measurement at the millikelvin stage and could form the basis for a scalable quantum-to-classical interface.
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