title: Entangling quantum-logic gate operated with an ultrabright semiconductor single-photon source.
abstract: We demonstrate the unambiguous entangling operation of a photonic quantum-logic gate driven by an ultrabright solid-state single-photon source. Indistinguishable single photons emitted by a single semiconductor quantum dot in a micropillar optical cavity are used as target and control qubits. For a source brightness of 0.56 photons per pulse, the measured truth table has an overlap with the ideal case of 68.4±0.5%, increasing to 73.0±1.6% for a source brightness of 0.17 photons per pulse. The gate is entangling: At a source brightness of 0.48, the Bell-state fidelity is above the entangling threshold of 50% and reaches 71.0±3.6% for a source brightness of 0.15.
authors.affiliation: Laboratoire de Photonique et de Nanostructures, CNRS, UPR20, Route de Nozay, 91460 Marcoussis, France.
authors.forename: O
authors.initials: O
authors.lastname: Gazzano
authors.forename: M P
authors.initials: MP
authors.lastname: Almeida
authors.forename: A K
authors.initials: AK
authors.lastname: Nowak
authors.forename: S L
authors.initials: SL
authors.lastname: Portalupi
authors.forename: A
authors.initials: A
authors.lastname: Lemaître
authors.forename: I
authors.initials: I
authors.lastname: Sagnes
authors.forename: A G
authors.initials: AG
authors.lastname: White
authors.forename: P
authors.initials: P
authors.lastname: Senellart