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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Fröwis, Florian Sekatski, Pavel Dür, Wolfgang |
| Description | Country affiliation: Switzerland Author Affiliation: Fröwis F ( Group of Applied Physics, University of Geneva, 1211 Geneva, Switzerland.); Sekatski P ( Institut für Theoretische Physik, Universität Innsbruck, Technikerstraße 21a, 6020 Innsbruck, Austria.); Dür W ( Institut für Theoretische Physik, Universität Innsbruck, Technikerstraße 21a, 6020 Innsbruck, Austria.) |
| Abstract | We propose an experimentally accessible scheme to determine the lower bounds on the quantum Fisher information (QFI), which ascertains multipartite entanglement or usefulness for quantum metrology. The scheme is based on comparing the measurement statistics of a state before and after a small unitary rotation. We argue that, in general, the limited resolution of collective observables prevents the detection of large QFI. This can be overcome by performing an additional operation prior to the measurement. We illustrate the power of this protocol for present-day spin-squeezing experiments, where the same operation used for the preparation of the initial spin-squeezed state improves also the measurement precision and hence the lower bound on the QFI by 2 orders of magnitude. We also establish a connection to the Leggett-Garg inequalities. We show how to simulate a variant of the inequalities with our protocol and demonstrate that large QFI is necessary for their violation with coarse-grained detectors. |
| File Format | HTM / HTML |
| ISSN | 00319007 |
| e-ISSN | 10797114 |
| Journal | Physical Review Letters |
| Issue Number | 9 |
| Volume Number | 116 |
| Language | English |
| Publisher | American Physical Society |
| Publisher Date | 2016-03-04 |
| Publisher Place | United States |
| Access Restriction | Open |
| Subject Keyword | Physics |
| Content Type | Text |
| Resource Type | Article |
| Subject | Physics and Astronomy |
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