Experimental application of decoherence-free subspaces in a quantum-computing algorithm

Details Experimental application of decoherence-free subspaces in a quantum-computing algorithm Experimental application of decoherence-free subspaces in a quantum-computing algorithm

2002-12-23

arxiv.org/abs/quant-ph/0212134v1

Phys. Rev. Lett. 91, 187903 (2003)

Physics

Quantum Physics

11 pages, 4 figures, submitted to PRL

Scientific paper

10.1103/PhysRevLett.91.187903

For a practical quantum computer to operate, it will be 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 essentially its pre-noise value of 8%.

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