title: Demonstration of conditional quantum phase shift between ions in a solid.
abstract: Because of their long coherence times, dopant ions have been considered promising candidates for scalable solid state quantum computing. Here we demonstrate a conditional phase shift between two qubits based on an optical transition of europium ions. The demonstration uses ensembles that have been selected from a randomly doped sample using spectral hole burning techniques. The electron dipole-dipole interaction between the ions that usually causes instantaneous spectral diffusion is used to generate the conditional phase shift.
authors.affiliation: Laser Physics Center, Research School of Physical Sciences and Engineering, Australian National University, Canberra, ACT 0200, Australia. jevon.longdell@anu.edu.au
authors.forename: J J
authors.initials: JJ
authors.lastname: Longdell
authors.forename: M J
authors.initials: MJ
authors.lastname: Sellars
authors.forename: N B
authors.initials: NB
authors.lastname: Manson