Comparison of unitary transforms using Franson interferometry

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Andersson, Anna and Bergou, J. and Jex, I. (2005) Comparison of unitary transforms using Franson interferometry. Journal of Modern Optics, 52 (10). pp. 1485-1494. ISSN 1362-3044 (https://doi.org/10.1080/09500340500052911)

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Abstract

Unknown unitary transforms may be compared to each other in a way which makes it possible to obtain an unambiguous answer, indicating that the transforms are different, already after a single application of each transform. Quantum comparison strategies may be useful for example if we want to test the performance of individual gates in a quantum information or quantum computing network. It is then possible to check for errors by comparing the elements to a master copy of the gate, instead of performing a complete tomography of the gate. In this paper we propose a versatile linear optical implementation based on the Franson interferometer with short and long arms. A click in the wrong output port unambiguously determines that the tested gate is faulty. This set-up can also be used for a variety of other tasks, such as confirming that the two transforms do not commute or do not anticommute.

  • Item type:Article
    ID code:31119
    Dates:
    Date
    Event
    10 July 2005
    Published
    Subjects:Science > Physics
    Department:Faculty of Science > Physics
    Depositing user: Pure Administrator
    Date deposited:01 Jul 2011 09:14
    Last modified:11 Nov 2024 09:44
    URI:https://strathprints.strath.ac.uk/id/eprint/31119
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