Faster quantum simulation by randomization

Andrew M. Childs1,2,3, Aaron Ostrander2,3,4, and Yuan Su1,2,3

1Department of Computer Science, University of Maryland
2Institute for Advanced Computer Studies, University of Maryland
3Joint Center for Quantum Information and Computer Science, University of Maryland
4Department of Physics, University of Maryland

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Abstract

Product formulas can be used to simulate Hamiltonian dynamics on a quantum computer by approximating the exponential of a sum of operators by a product of exponentials of the individual summands. This approach is both straightforward and surprisingly efficient. We show that by simply randomizing how the summands are ordered, one can prove stronger bounds on the quality of approximation for product formulas of any given order, and thereby give more efficient simulations. Indeed, we show that these bounds can be asymptotically better than previous bounds that exploit commutation between the summands, despite using much less information about the structure of the Hamiltonian. Numerical evidence suggests that the randomized approach has better empirical performance as well.

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The above citations are from Crossref's cited-by service (last updated successfully 2024-04-19 05:03:25) and SAO/NASA ADS (last updated successfully 2024-04-19 05:03:26). The list may be incomplete as not all publishers provide suitable and complete citation data.