Experimental application of decoherence-free subspaces in an optical quantum-computing algorithm |
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Authors: | Mohseni M Lundeen J S Resch K J Steinberg A M |
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Affiliation: | Department of Physics, University of Toronto, 60 St. George Street, Toronto, Ontario, Canada, M5S 1A7. |
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Abstract: | 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. |
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