Composite Quantum Simulations
1Department of Physics, University of Toronto, Toronto ON, Canada
2Department of Computer Science, University of Toronto, Toronto ON, Canada
3Pacific Northwest National Laboratory, Richland Wa, USA
4Canadian Institute for Advanced Study, Toronto ON, Canada
Published: | 2023-11-14, volume 7, page 1181 |
Eprint: | arXiv:2206.06409v3 |
Doi: | https://doi.org/10.22331/q-2023-11-14-1181 |
Citation: | Quantum 7, 1181 (2023). |
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Abstract
In this paper we provide a framework for combining multiple quantum simulation methods, such as Trotter-Suzuki formulas and QDrift into a single Composite channel that builds upon older coalescing ideas for reducing gate counts. The central idea behind our approach is to use a partitioning scheme that allocates a Hamiltonian term to the Trotter or QDrift part of a channel within the simulation. This allows us to simulate small but numerous terms using QDrift while simulating the larger terms using a high-order Trotter-Suzuki formula. We prove rigorous bounds on the diamond distance between the Composite channel and the ideal simulation channel and show under what conditions the cost of implementing the Composite channel is asymptotically upper bounded by the methods that comprise it for both probabilistic partitioning of terms and deterministic partitioning. Finally, we discuss strategies for determining partitioning schemes as well as methods for incorporating different simulation methods within the same framework.
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► References
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