Multiphoton quantum interference in a multiport integrated photonic device

Metcalf, Benjamin J., Thomas-Peter, Nicholas, Spring, Justin B., Kundys, Dmytro, Broome, Matthew A., Humphreys, Peter C., Jin, Xian-Min, Barbieri, Marco, Kolthammer, W. Steven, Gates, James C., Smith, Brian J., Langford, Nathan K., Smith, Peter G. R. and Walmsley, Ian A. (2013) Multiphoton quantum interference in a multiport integrated photonic device. Nature Communications, 4 1356.1-1356.7. doi:10.1038/ncomms2349

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Author Metcalf, Benjamin J.
Thomas-Peter, Nicholas
Spring, Justin B.
Kundys, Dmytro
Broome, Matthew A.
Humphreys, Peter C.
Jin, Xian-Min
Barbieri, Marco
Kolthammer, W. Steven
Gates, James C.
Smith, Brian J.
Langford, Nathan K.
Smith, Peter G. R.
Walmsley, Ian A.
Title Multiphoton quantum interference in a multiport integrated photonic device
Journal name Nature Communications   Check publisher's open access policy
ISSN 2041-1723
Publication date 2013-01-01
Sub-type Article (original research)
DOI 10.1038/ncomms2349
Open Access Status File (Publisher version)
Volume 4
Start page 1356.1
End page 1356.7
Total pages 7
Place of publication London, United Kingdom
Publisher Nature Publishing Group
Language eng
Subject 1600 Chemistry
1300 Biochemistry, Genetics and Molecular Biology
3100 Physics and Astronomy
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.
Keyword Circuits
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Mathematics and Physics
Official 2014 Collection
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Citation counts: TR Web of Science Citation Count  Cited 72 times in Thomson Reuters Web of Science Article | Citations
Scopus Citation Count Cited 83 times in Scopus Article | Citations
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