title: Nearly deterministic bell measurement for multiphoton qubits and its application to quantum information processing.
abstract: We propose a Bell-measurement scheme by employing a logical qubit in Greenberger-Horne-Zeilinger entanglement with an arbitrary number of photons. Remarkably, the success probability of the Bell measurement as well as teleportation of the Greenberger-Horne-Zeilinger entanglement can be made arbitrarily high using only linear optics elements and photon on-off measurements as the number of photons increases. Our scheme outperforms previous proposals using single-photon qubits when comparing the success probabilities in terms of the average photon usages. It has another important advantage for experimental feasibility in that it does not require photon-number-resolving measurements. Our proposal provides an alternative candidate for all-optical quantum information processing.
authors.affiliation: Center for Macroscopic Quantum Control, Department of Physics and Astronomy, Seoul National University, Seoul 151-742, Korea.
authors.forename: Seung-Woo
authors.initials: SW
authors.lastname: Lee
authors.affiliation: Center for Macroscopic Quantum Control, Department of Physics and Astronomy, Seoul National University, Seoul 151-742, Korea.|Department of Optics, Palacký University, 17 Listopadu 1192/12, 77146 Olomouc, Czech Republic.
authors.forename: Kimin
authors.initials: K
authors.lastname: Park
authors.affiliation: Centre for Quantum Computation and Communication Technology, School of Mathematics and Physics, University of Queensland, St. Lucia, Queensland 4072, Australia.
authors.forename: Timothy C
authors.initials: TC
authors.lastname: Ralph
authors.affiliation: Center for Macroscopic Quantum Control, Department of Physics and Astronomy, Seoul National University, Seoul 151-742, Korea.
authors.forename: Hyunseok
authors.initials: H
authors.lastname: Jeong