title: Operating a (87)Sr optical lattice clock with high precision and at high density.
abstract: We describe recent experimental progress with the JILA Sr optical frequency standard, which has a systematic uncertainty at the 10-(16) fractional frequency level. An upgraded laser system has recently been constructed in our lab which may allow the JILA Sr standard to reach the standard quantum measurement limit and achieve record levels of stability. To take full advantage of these improvements, it will be necessary to operate a lattice clock with a large number of atoms, and systematic frequency shifts resulting from atomic interactions will become increasingly important. We discuss how collisional frequency shifts can arise in an optical lattice clock employing fermionic atoms and describe a novel method by which such systematic effects can be suppressed.
authors.affiliation: JILA, National Institute of Standards and Technology, Boulder, CO, and the University of Colorado, Boulder, CO, USA. swallows@jila.colorado.edu
authors.forename: Matthew
authors.initials: M
authors.lastname: Swallows
authors.forename: Michael
authors.initials: M
authors.lastname: Martin
authors.forename: Michael
authors.initials: M
authors.lastname: Bishof
authors.forename: Craig
authors.initials: C
authors.lastname: Benko
authors.forename: Yige
authors.initials: Y
authors.lastname: Lin
authors.forename: Sebastian
authors.initials: S
authors.lastname: Blatt
authors.forename: Ana Maria
authors.initials: AM
authors.lastname: Rey
authors.forename: Jun
authors.initials: J
authors.lastname: Ye