title: Efficient atomic clocks operated with several atomic ensembles.
abstract: Atomic clocks are typically operated by locking a local oscillator (LO) to a single atomic ensemble. In this Letter, we propose a scheme where the LO is locked to several atomic ensembles instead of one. This results in an exponential improvement compared to the conventional method and provides a stability of the clock scaling as (αN)(-m/2) with N being the number of atoms in each of the m ensembles and α a constant depending on the protocol being used to lock the LO.
authors.affiliation: QUANTOP, The Niels Bohr Institute, University of Copenhagen, Blegdamsvej 17, DK-2100 Copenhagen Ø, Denmark.
authors.forename: J
authors.initials: J
authors.lastname: Borregaard
authors.forename: A S
authors.initials: AS
authors.lastname: Sørensen