Collisional shifts in optical-lattice atom clocks

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8 Scopus citations


We theoretically study the effects of elastic collisions on the determination of frequency standards via Ramsey-fringe spectroscopy in optical-lattice atom clocks. Interparticle interactions of bosonic atoms in multiply occupied lattice sites can cause a linear frequency shift, as well as generate asymmetric Ramsey-fringe patterns and reduce fringe visibility due to interparticle entanglement. We propose a method of reducing these collisional effects in an optical lattice by introducing a phase difference of π between the Ramsey driving fields in adjacent sites. This configuration suppresses site-to-site hopping due to interference of two tunneling pathways, without degrading fringe visibility. Consequently, the probability of double occupancy is reduced, leading to cancellation of collisional shifts.

Original languageEnglish
Article number033807
JournalPhysical Review A - Atomic, Molecular, and Optical Physics
Issue number3
StatePublished - 21 Sep 2006

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics


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