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Physical Review A

Addendum to “Grover search with pairs of trapped ions”

Zhenyu Xu, Mang Feng

Published Jul 7, 2008• 6 citations
Publisher

Abstract

The authors call attention to a previous work [M. Feng, Phys. Rev. A 63, 052308 (2001)] for Grover search by trapped ions in decoherence-free subspace (DFS). A scheme for a two-qubit conditional-phase flip gate in DFS is presented as a supplement.
DOI
10.1103/physreva.78.014301

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In this Comment on Feng's paper [Phys. Rev. A 63, 052308 (2001)], we show that Grover's algorithm may be performed exactly using the gate set given, provided that small changes are made to the gate sequence. An analytic expression for the probability of success of Grover's algorithm for any unitary operator UUU instead of Hadamard gate is presented.
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