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 0950-0340Full text not available in this repository. (Request a copy from the Strathclyde author)
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.
|Keywords:||Franson interferometry, unitary transforms , tomography, Physics, Atomic and Molecular Physics, and Optics|
|Subjects:||Science > Physics|
|Department:||Faculty of Science > Physics|
|Depositing user:||Pure Administrator|
|Date Deposited:||01 Jul 2011 09:14|
|Last modified:||27 Apr 2016 16:45|