期刊
SCIENCE
卷 339, 期 6116, 页码 178-181出版社
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.1226897
关键词
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资金
- Office of the Director of National Intelligence (ODNI), Intelligence Advanced Research Projects Activity (IARPA), through the Army Research Office [W911NF-09-1-0369]
- U.S. Army Research Office [W911NF-09-1-0514]
- Agence National de Recherche [ANR-09-JCJC-0070]
- College de France
- NSF DMR [1004406]
- Agence Nationale de la Recherche (ANR) [ANR-09-JCJC-0070] Funding Source: Agence Nationale de la Recherche (ANR)
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [1004406] Funding Source: National Science Foundation
Measuring a quantum system can randomly perturb its state. The strength and nature of this back-action depend on the quantity that is measured. In a partial measurement performed by an ideal apparatus, quantum physics predicts that the system remains in a pure state whose evolution can be tracked perfectly from the measurement record. We demonstrated this property using a superconducting qubit dispersively coupled to a cavity traversed by a microwave signal. The back-action on the qubit state of a single measurement of both signal quadratures was observed and shown to produce a stochastic operation whose action is determined by the measurement result. This accurate monitoring of a qubit state is an essential prerequisite for measurement-based feedback control of quantum systems.
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