Collisional shifts in optical-lattice atom clocks

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Y. B. Band^1,2,3 and A. Vardi¹
¹Department of Chemistry, Ben-Gurion University of the Negev, Beer-Sheva 84105, Israel
²Atomic Physics Division, A267 Physics, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, USA
³The Ilse Katz Center for Nano-Science, Ben-Gurion University of the Negev, Beer-Sheva 84105, Israel

Received 19 March 2006; published 12 September 2006

Wetheoretically study the effects of elastic collisions on the determinationof frequency standards via Ramsey-fringe spectroscopy in optical-lattice atom clocks.Interparticle interactions of bosonic atoms in multiply occupied lattice sitescan cause a linear frequency shift, as well as generateasymmetric Ramsey-fringe patterns and reduce fringe visibility due to interparticleentanglement. We propose a method of reducing these collisional effectsin an optical lattice by introducing a phase difference of between the Ramsey driving fields in adjacent sites. Thisconfiguration suppresses site-to-site hopping due to interference of two tunnelingpathways, without degrading fringe visibility. Consequently, the probability of doubleoccupancy is reduced, leading to cancellation of collisional shifts.

URL:	http://link.aps.org/doi/10.1103/PhysRevA.74.033807
DOI:	10.1103/PhysRevA.74.033807
PACS:	42.50.Ct; 42.50.Gy; 03.75.Lm; 42.62.Eh 42.50.Ct Quantum description of interaction of light and matter; related experiments 42.50.Gy Effects of atomic coherence on propagation, absorption, and amplification of light; electromagnetically induced transparency and absorption 03.75.Lm Josephson effect, tunneling, Bose-Einstein condensates in periodic potentials, solitons, vortices, and topological excitations 42.62.Eh Metrological applications of lasers; optical frequency synthesizers for precision spectroscopy YEAR: 2006
KEYWORDS:	atomic clocks, frequency standards, boson systems, quantum entanglement, tunnelling

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