High threshold distributed quantum computing with three-qubit nodes

Details High threshold distributed quantum computing with three-qubit nodes High threshold distributed quantum computing with three-qubit nodes

2012-04-02

arxiv.org/abs/1204.0443v1

Physics

Quantum Physics

5 figures, 12 pages in single column format

Scientific paper

In the distributed quantum computing paradigm, well-controlled few-qubit 'nodes' are networked together by connections which are relatively noisy and failure prone. A practical scheme must offer high tolerance to errors while requiring only simple (i.e. few-qubit) nodes. Here we show that relatively simple, three-qubit nodes can support purification techniques and so offer robust scalability: the infidelity in the entanglement channel may be permitted to approach 10% if the infidelity in local operations is of order 0.1%. This architecture remains robust even in the presence of considerable decoherence rates (memory errors). We compare the performance with that of schemes involving nodes of lower and higher complexity. Ion traps, and NV- centres in diamond, are two highly relevant emerging technologies.

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