High-fidelity operation of quantum photonic circuits

Anthony Laing, Alberto Peruzzo, Alberto Politi, Maria Rodas Verde, Matthaeus Halder, Timothy C. Ralph, Mark G. Thompson, Jeremy L. O'Brien

Research output: Contribution to journalArticlepeer-review

73 Citations (Scopus)
44 Downloads (Pure)

Abstract

We demonstrate photonic quantum circuits that operate at the stringent levels that will be required for future quantum information science and technology. These circuits are fabricated from silica-on-silicon waveguides forming directional couplers and interferometers. While our focus is on the operation of quantum circuits, to test this operation required construction of a photon source that produced near-identical pairs of photons. We show nonclassical interference with two photons and a two-photon entangling logic gate that operate with near-unit fidelity. These results are a significant step toward large-scale operation of photonic quantum circuits.

Original languageEnglish
Article number211109
JournalApplied Physics Letters
Volume97
Issue number21
DOIs
Publication statusPublished - 22 Nov 2010
Externally publishedYes

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