Quantum Back-Action of an Individual Variable-Strength Measurement.
Saved in:
| Title: | Quantum Back-Action of an Individual Variable-Strength Measurement. |
|---|---|
| Authors: | Hatridge, M., Shankar, S., Mirrahimi, M., Schackert, F., Geerlings, K., Brecht, T., Sliwa, K. M., Frunzio, B. Abdo L., Girvin, S. M., Schoelkopf, R. J., Devoret, M. H. |
| Source: | Science (pre-March 2025). 1/11/2013, Vol. 339 Issue 6116, p178-181. 4p. |
| Subjects: | Quantum theory, Measurement, Superconductors, Qubits, Microwaves, Stochastic processes, Quadrature domains, Mathematical models |
| Abstract: | 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 idea[ 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. [ABSTRACT FROM AUTHOR] |
| Copyright of Science (pre-March 2025) is the property of American Association for the Advancement of Science and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) | |
| Database: | Psychology and Behavioral Sciences Collection |
Be the first to leave a comment!
