Quantum parallelism as a tool for ensemble spin dynamics calculations

Details Quantum parallelism as a tool for ensemble spin dynamics calculations Quantum parallelism as a tool for ensemble spin dynamics calculations

2007-10-19

arxiv.org/abs/0710.3747v3

Phys. Rev. Lett. 101, 120503 (2008)

Physics

Quantum Physics

5 pages, 3 figures, improved version of the manuscript

Scientific paper

10.1103/PhysRevLett.101.120503

Efficient simulations of quantum evolutions of spin-1/2 systems are relevant for ensemble quantum computation as well as in typical NMR experiments. We propose an efficient method to calculate the dynamics of an observable provided that the initial excitation is "local". It resorts a single entangled pure initial state built as a superposition, with random phases, of the pure elements that compose the mixture. This ensures self-averaging of any observable, drastically reducing the calculation time. The procedure is tested for two representative systems: a spin star (cluster with random long range interactions) and a spin ladder.

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