Improvement of an Atomic Clock using Squeezed Vacuum

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dc.identifier.uri Kruse, I. Lange, K. Peise, J. Lücke, Bernd Pezze, L. Arlt, Jan J. Ertmer, Wolfgang Lisdat, C. Santos, Luis Smerzi, A. Klempt, Carsten 2018-08-22T12:35:00Z 2018-08-22T12:35:00Z 2016
dc.identifier.citation Kruse, I.; Lange, K.; Peise, J.; Luecke, B.; Klempt, C.; et al: Improvement of an Atomic Clock using Squeezed Vacuum. In: Physical Review Letters 117 (2016), Nr. 14, 143004. DOI:
dc.description.abstract Since the pioneering work of Ramsey, atom interferometers are employed for precision metrology, in particular to measure time and to realize the second. In a classical interferometer, an ensemble of atoms is prepared in one of the two input states, whereas the second one is left empty. In this case, the vacuum noise restricts the precision of the interferometer to the standard quantum limit (SQL). Here, we propose and experimentally demonstrate a novel clock configuration that surpasses the SQL by squeezing the vacuum in the empty input state. We create a squeezed vacuum state containing an average of 0.75 atoms to improve the clock sensitivity of 10000 atoms by 2.05(-0:37)(+0.34) dB. The SQL poses a significant limitation for today's microwave fountain clocks, which serve as the main time reference. We evaluate the major technical limitations and challenges for devising a next generation of fountain clocks based on atomic squeezed vacuum. eng
dc.language.iso eng
dc.publisher College Park : American Physical Society
dc.relation.ispartofseries Physical Review Letters 117 (2016), Nr. 14
dc.rights Es gilt deutsches Urheberrecht. Das Dokument darf zum eigenen Gebrauch kostenfrei genutzt, aber nicht im Internet bereitgestellt oder an Außenstehende weitergegeben werden.
dc.subject standard quantum limit eng
dc.subject spin states eng
dc.subject entanglement eng
dc.subject sensitivity eng
dc.subject times eng
dc.subject.ddc 530 | Physik ger
dc.title Improvement of an Atomic Clock using Squeezed Vacuum
dc.type article
dc.type Text
dc.relation.essn 1079-7114
dc.relation.issn 0031-9007
dc.bibliographicCitation.issue 14
dc.bibliographicCitation.volume 117
dc.bibliographicCitation.firstPage 143004
dc.description.version publishedVersion
tib.accessRights frei zug�nglich

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