Reduce, reuse, recycle, for robust cluster state generation

Details Reduce, reuse, recycle, for robust cluster state generation Reduce, reuse, recycle, for robust cluster state generation

2010-05-10

arxiv.org/abs/1005.1621v6

Phys. Rev. A 83, 042327 (2011)

Physics

Quantum Physics

4 pages, 3 figures; v2 significant update, results improved, typos and references fixed; v3 minor update in response to refere

Scientific paper

10.1103/PhysRevA.83.042327

Efficient generation of cluster states is crucial for engineering large-scale measurement-based quantum computers. Hybrid matter-optical systems offer a robust, scalable path to this goal. Such systems have an ancilla which acts as a bus connecting the qubits. We show that by generating smaller cluster "Lego bricks", reusing one ancilla per brick, the cluster can be produced with maximal efficiency, requiring fewer than half the operations compared with no bus reuse. By reducing the time required to prepare sections of the cluster, bus reuse more than doubles the size of the computational workspace that can be used before decoherence effects dominate. A row of buses in parallel provides fully scalable cluster state generation requiring only 20 CPhase gates per bus use.

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