Constructing arbitrary Steane code single logical qubit fault-tolerant gates

Details Constructing arbitrary Steane code single logical qubit fault-tolerant gates Constructing arbitrary Steane code single logical qubit fault-tolerant gates

2004-11-30

arxiv.org/abs/quant-ph/0411206v2

Quantum Information and Computation 11, 867-873 (2011)

Physics

Quantum Physics

8 pages, 2 figures. Much shorter version containing only the results still relevant to the field

Scientific paper

We present a simple method for constructing optimal fault-tolerant approximations of arbitrary unitary gates using an arbitrary discrete universal gate set. The method presented is numerical and scales exponentially with the number of gates used in the approximation. However, for the specific case of arbitrary single-qubit gates and the fault-tolerant gates permitted by the concatenated 7-qubit Steane code, we find gate sequences sufficiently long and accurate to permit the fault-tolerant factoring of numbers thousands of bits long. A general scaling law of how rapidly these fault-tolerant approximations converge to arbitrary single-qubit gates is also determined.

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