Entangling the lattice clock: Towards Heisenberg-limited timekeeping

Details Entangling the lattice clock: Towards Heisenberg-limited timekeeping Entangling the lattice clock: Towards Heisenberg-limited timekeeping

2009-12-06

arxiv.org/abs/0912.1075v1

Phys. Rev. A 81, 030302(R) (2010)

Physics

Quantum Physics

5 pages, 2 figs

Scientific paper

We present a scheme for entangling the atoms of an optical lattice to reduce the quantum projection noise of a clock measurement. The divalent clock atoms are held in a lattice at a ``magic'' wavelength that does not perturb the clock frequency -- to maintain clock accuracy -- while an open-shell J=1/2 ``head'' atom is coherently transported between lattice sites via the lattice polarization. This polarization-dependent ``Archimedes' screw'' transport at magic wavelength takes advantage of the vanishing vector polarizability of the scalar, J=0, clock states of bosonic isotopes of divalent atoms. The on-site interactions between the clock atoms and the head atom are used to engineer entanglement and for clock readout.

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