title: High-accuracy measurement of atomic polarizability in an optical lattice clock.
abstract: Presently, the Stark effect contributes the largest source of uncertainty in a ytterbium optical atomic clock through blackbody radiation. By employing an ultracold, trapped atomic ensemble and high stability optical clock, we characterize the quadratic Stark effect with unprecedented precision. We report the ytterbium optical clock's sensitivity to electric fields (such as blackbody radiation) as the differential static polarizability of the ground and excited clock levels α(clock) = 36.2612(7)  kHz (kV/cm)(-2). The clock's uncertainty due to room temperature blackbody radiation is reduced by an order of magnitude to 3×10(-17).
authors.affiliation: National Institute of Standards and Technology, 325 Broadway, Boulder, Colorado 80305, USA. jeff.sherman@nist.gov
authors.forename: J A
authors.initials: JA
authors.lastname: Sherman
authors.forename: N D
authors.initials: ND
authors.lastname: Lemke
authors.forename: N
authors.initials: N
authors.lastname: Hinkley
authors.forename: M
authors.initials: M
authors.lastname: Pizzocaro
authors.forename: R W
authors.initials: RW
authors.lastname: Fox
authors.forename: A D
authors.initials: AD
authors.lastname: Ludlow
authors.forename: C W
authors.initials: CW
authors.lastname: Oates