Direct characterization of any linear photonic device

Fedrizzi, Alessandro, Broome, Matthew A., White, Andrew G., Fickler, Robert, Rahimi-Keshari, Saleh and Ralph, Timothy C. (2013). Direct characterization of any linear photonic device. In: APS March Meeting 2013. Proceedings. APS March Meeting 2013, Baltimore, MD, USA, (). 18–22 March, 2013.

Author Fedrizzi, Alessandro
Broome, Matthew A.
White, Andrew G.
Fickler, Robert
Rahimi-Keshari, Saleh
Ralph, Timothy C.
Title of paper Direct characterization of any linear photonic device
Conference name APS March Meeting 2013
Conference location Baltimore, MD, USA
Conference dates 18–22 March, 2013
Proceedings title APS March Meeting 2013. Proceedings   Check publisher's open access policy
Journal name Bulletin of the American Physical Society   Check publisher's open access policy
Place of Publication College Park, MD, United States
Publisher American Physical Society
Publication Year 2013
Sub-type Published abstract
Open Access Status Link (no DOI)
ISSN 0003-0503
Volume 58
Issue 1
Total pages 1
Language eng
Formatted Abstract/Summary
Linear photonic devices comprised of simple beamsplitters and phase shifters can implement any unitary operator for quantum information processing. The significant practical challenge is to characterize such an interferometric device once it is built. Performing quantum process tomography requires the full suite of quantum tools such as N-mode quantum state preparation and measurement, and is, despite progress on more efficient methods, slow and impractical for large interferometric devices. Here we introduce a simple technique to characterize the unitary matrix of a linear photonic device using standard laser sources and photodetectors, without the requirement for active locking or single-photon sources. Our method is precise and efficient, requiring only 2N-1 measurement configurations for a N-path network. We use it experimentally to characterise an integrated 3x3 fused-fibre coupler and highlight its precision by comparing measured quantum interference patterns with those predicted using the classically-estimated unitary. We observe excellent agreement between the two experimental methods.
Subjects 3105 Instrumentation
3107 Atomic and Molecular Physics, and Optics
Q-Index Code EX
Q-Index Status Provisional Code
Institutional Status UQ
Additional Notes Abstract: B26.00004

Document type: Conference Paper
Sub-type: Published abstract
Collections: School of Mathematics and Physics
Centre for Quantum Computer Technology Publications
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Created: Wed, 06 Aug 2014, 00:47:33 EST by Jon Swabey on behalf of Engineered Quantum Systems