| Autor: |
Norris LM; Center for Quantum Information and Control, University of New Mexico, Albuquerque, New Mexico 87131-0001, USA. norrisl@unm.edu, Trail CM, Jessen PS, Deutsch IH |
| Jazyk: |
angličtina |
| Zdroj: |
Physical review letters [Phys Rev Lett] 2012 Oct 26; Vol. 109 (17), pp. 173603. Date of Electronic Publication: 2012 Oct 23. |
| DOI: |
10.1103/PhysRevLett.109.173603 |
| Abstrakt: |
Unitary control of qudits can improve the collective spin squeezing of an atomic ensemble. Preparing the atoms in a state with large quantum fluctuations in magnetization strengthens the entangling Faraday interaction. The resulting increase in interatomic entanglement can be converted into metrologically useful spin squeezing. Further control can squeeze the internal atomic spin without compromising entanglement, providing an overall multiplicative factor in the collective squeezing. We model the effects of optical pumping and study the tradeoffs between enhanced entanglement and decoherence. For realistic parameters we see improvements of ~10 dB. |
| Databáze: |
MEDLINE |
| Externí odkaz: |
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