Sequential measurement-based quantum computing with memories

Details Sequential measurement-based quantum computing with memories Sequential measurement-based quantum computing with memories

2011-03-09

arxiv.org/abs/1103.1907v2

Phys. Rev. A 83, 062332 (2011)

Physics

Quantum Physics

6 pages, 4 figures

Scientific paper

We introduce a general scheme for sequential one-way quantum computation where static systems with long-living quantum coherence (memories) interact with moving systems that may possess very short coherence times. Both the generation of the cluster state needed for the computation and its consumption by measurements are carried out simultaneously. As a consequence, effective clusters of one spatial dimension fewer than in the standard approach are sufficient for computation. In particular, universal computation requires only a one-dimensional array of memories. The scheme applies to discrete-variable systems of any dimension as well as to continuous-variable ones, and both are treated equivalently under the light of local complementation of graphs. In this way our formalism introduces a general framework that encompasses and generalizes in a unified manner some previous system-dependent proposals. The procedure is intrinsically well-suited for implementations with atom-photon interfaces.

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