Experimental application of decoherence-free subspaces in an optical quantum-computing algorithm

For a practical quantum computer to operate, it is essential to properly manage decoherence. One important technique for doing this is the use of "decoherence-free subspaces" (DFSs), which have recently been demonstrated. Here we present the first use of DFSs to improve the performance of...

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Veröffentlicht in:	Physical review letters 2003-10, Vol.91 (18), p.187903-187903, Article 187903
Hauptverfasser:	Mohseni, M, Lundeen, J S, Resch, K J, Steinberg, A M
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Sprache:	eng
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creator	Mohseni, M Lundeen, J S Resch, K J Steinberg, A M
description	For a practical quantum computer to operate, it is essential to properly manage decoherence. One important technique for doing this is the use of "decoherence-free subspaces" (DFSs), which have recently been demonstrated. Here we present the first use of DFSs to improve the performance of a quantum algorithm. An optical implementation of the Deutsch-Jozsa algorithm can be made insensitive to a particular class of phase noise by encoding information in the appropriate subspaces; we observe a reduction of the error rate from 35% to 7%, essentially its value in the absence of noise.
doi_str_mv	10.1103/physrevlett.91.187903
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title	Experimental application of decoherence-free subspaces in an optical quantum-computing algorithm
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