title: Demonstration of a simple entangling optical gate and its use in bell-state analysis.
abstract: We demonstrate a new architecture for an optical entangling gate that is significantly simpler than previous realizations, using partially polarizing beam splitters so that only a single optical mode-matching condition is required. We demonstrate operation of a controlled-z gate in both continuous-wave and pulsed regimes of operation, fully characterizing it in each case using quantum process tomography. We also demonstrate a fully resolving, nondeterministic optical Bell-state analyzer based on this controlled-z gate. This new architecture is ideally suited to guided optics implementations of optical gates.
authors.affiliation: Centre for Quantum Computer Technology, University of Queensland, Brisbane QLD 4072, Australia.
authors.forename: N K
authors.initials: NK
authors.lastname: Langford
authors.forename: T J
authors.initials: TJ
authors.lastname: Weinhold
authors.forename: R
authors.initials: R
authors.lastname: Prevedel
authors.forename: K J
authors.initials: KJ
authors.lastname: Resch
authors.forename: A
authors.initials: A
authors.lastname: Gilchrist
authors.forename: J L
authors.initials: JL
authors.lastname: O'Brien
authors.forename: G J
authors.initials: GJ
authors.lastname: Pryde
authors.forename: A G
authors.initials: AG
authors.lastname: White