Simulation of Many-Body Hamiltonians using Perturbation Theory with Bounded-Strength Interactions

Details Simulation of Many-Body Hamiltonians using Perturbation Theory with Bounded-Strength Interactions Simulation of Many-Body Hamiltonians using Perturbation Theory with Bounded-Strength Interactions

2008-03-18

arxiv.org/abs/0803.2686v1

Phys.Rev.Lett.101:070503,2008

Physics

Quantum Physics

v1: 8 pages Latex, 1 figure

Scientific paper

10.1103/PhysRevLett.101.070503

We show how to map a given n-qubit target Hamiltonian with bounded-strength k-body interactions onto a simulator Hamiltonian with two-body interactions, such that the ground-state energy of the target and the simulator Hamiltonians are the same up to an extensive error O(epsilon n) for arbitrary small epsilon. The strength of interactions in the simulator Hamiltonian depends on epsilon and k but does not depend on n. We accomplish this reduction using a new way of deriving an effective low-energy Hamiltonian which relies on the Schrieffer-Wolff transformation of many-body physics.

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