High-fidelity universal quantum gates through quantum interference

Details High-fidelity universal quantum gates through quantum interference High-fidelity universal quantum gates through quantum interference

2008-10-04

arxiv.org/abs/0810.0741v2

Proceedings of SPIE Vol. 7702 (SPIE, Bellingham, WA, 2010) 7702 OU

Physics

Quantum Physics

5 pages; 3 tables; no figures; discussion of reparameterization of sweeps added

Scientific paper

Twisted rapid passage is a type of non-adiabatic rapid passage that gives rise to controllable quantum interference effects that were first observed experimentally in 2003. We show that twisted rapid passage sweeps can be used to implement a universal set of quantum gates that operate with high-fidelity. For each gate in the universal set, sweep parameter values are provided which simulations indicate will yield a quantum gate with error probability P_{e} < 10**(-4). Note that all gates in this universal set are driven by a **single** type of control field (twisted rapid passage), and the error probability for each gate falls below the rough-and-ready estimate for the accuracy threshold P_{a} ~ 10**(-4). The simulations suggest that the universal gate set produced by twisted rapid passage shows promise for use in a fault-tolerant scheme for quantum computing.

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