| Autor: |
Hatridge, M., Shankar, S., Mirrahimi, M., Schackert, F., Geerlings, K., Brecht, T., Sliwa, K. M., Abdo, B., Frunzio, L., Girvin, S. M., Schoelkopf, R. J., Devoret, M. H. |
| Rok vydání: |
2019 |
| Předmět: |
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| Zdroj: |
Science 11 Jan 2013: Vol. 339, Issue 6116, pp. 178-181 |
| Druh dokumentu: |
Working Paper |
| DOI: |
10.1126/science.1226897 |
| Popis: |
Measuring a quantum system can randomly perturb its state. The strength and nature of this back-action depends on the quantity which 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 demonstrate 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 is 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. |
| Databáze: |
arXiv |
| Externí odkaz: |
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