Engineering integrated photonics for heralded quantum gates

Meany, Thomas, Biggerstaff, Devon N., Broome, Matthew A., Fedrizzi, Alessandro, Delanty, Michael, Steel, M. J., Gilchrist, Alexei, Marshall, Graham D., White, Andrew G. and Withford, Michael J. (2016) Engineering integrated photonics for heralded quantum gates. Scientific Reports, 6 25126: 1-8. doi:10.1038/srep25126

Author Meany, Thomas
Biggerstaff, Devon N.
Broome, Matthew A.
Fedrizzi, Alessandro
Delanty, Michael
Steel, M. J.
Gilchrist, Alexei
Marshall, Graham D.
White, Andrew G.
Withford, Michael J.
Title Engineering integrated photonics for heralded quantum gates
Journal name Scientific Reports   Check publisher's open access policy
ISSN 2045-2322
Publication date 2016-06-10
Year available 2016
Sub-type Article (original research)
DOI 10.1038/srep25126
Open Access Status DOI
Volume 6
Issue 25126
Start page 1
End page 8
Total pages 8
Place of publication London, United Kingdom
Publisher Nature Publishing Group
Collection year 2017
Language eng
Abstract Scaling up linear-optics quantum computing will require multi-photon gates which are compact, phase-stable, exhibit excellent quantum interference, and have success heralded by the detection of ancillary photons. We investigate the design, fabrication and characterisation of the optimal known gate scheme which meets these requirements: the Knill controlled-Z gate, implemented in integrated laser-written waveguide arrays. We show device performance to be less sensitive to phase variations in the circuit than to small deviations in the coupler reflectivity, which are expected given the tolerance values of the fabrication method. The mode fidelity is also shown to be less sensitive to reflectivity and phase errors than the process fidelity. Our best device achieves a fidelity of 0.931 ± 0.001 with the ideal 4 × 4 unitary circuit and a process fidelity of 0.680 ± 0.005 with the ideal computational-basis process.
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Mathematics and Physics
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