Multiphoton quantum interference in a multiport integrated photonic device

Benjamin J. Metcalf (), Nicholas Thomas-Peter, Justin B. Spring, Dmytro Kundys, Matthew A. Broome, Peter C. Humphreys, Xian-Min Jin, Marco Barbieri, W. Steven Kolthammer, James C. Gates, Brian J. Smith, Nathan K. Langford, Peter G.R. Smith and Ian A. Walmsley
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Benjamin J. Metcalf: Clarendon Laboratory, University of Oxford
Nicholas Thomas-Peter: Clarendon Laboratory, University of Oxford
Justin B. Spring: Clarendon Laboratory, University of Oxford
Dmytro Kundys: Optoelectronics Research Centre, University of Southampton
Matthew A. Broome: Centre for Engineered Quantum Systems and Centre for Quantum Computer and Communication Technology, School of Mathematics and Physics, University of Queensland
Peter C. Humphreys: Clarendon Laboratory, University of Oxford
Xian-Min Jin: Clarendon Laboratory, University of Oxford
Marco Barbieri: Clarendon Laboratory, University of Oxford
W. Steven Kolthammer: Clarendon Laboratory, University of Oxford
James C. Gates: Optoelectronics Research Centre, University of Southampton
Brian J. Smith: Clarendon Laboratory, University of Oxford
Nathan K. Langford: Royal Holloway, University of London
Peter G.R. Smith: Optoelectronics Research Centre, University of Southampton
Ian A. Walmsley: Clarendon Laboratory, University of Oxford

Nature Communications, 2013, vol. 4, issue 1, 1-7

Abstract: Abstract Increasing the complexity of quantum photonic devices is essential for many optical information processing applications to reach a regime beyond what can be classically simulated, and integrated photonics has emerged as a leading platform for achieving this. Here we demonstrate three-photon quantum operation of an integrated device containing three coupled interferometers, eight spatial modes and many classical and nonclassical interferences. This represents a critical advance over previous complexities and the first on-chip nonclassical interference with more than two photonic inputs. We introduce a new scheme to verify quantum behaviour, using classically characterised device elements and hierarchies of photon correlation functions. We accurately predict the device’s quantum behaviour and show operation inconsistent with both classical and bi-separable quantum models. Such methods for verifying multiphoton quantum behaviour are vital for achieving increased circuit complexity. Our experiment paves the way for the next generation of integrated photonic quantum simulation and computing devices.

Date: 2013
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DOI: 10.1038/ncomms2349

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