Lieb-Robinson Light Cone for Power-Law Interactions
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- 11 October 2021
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 127 (16), 160401
- https://doi.org/10.1103/physrevlett.127.160401
Abstract
The Lieb-Robinson theorem states that information propagates with a finite velocity in quantum systems on a lattice with nearest-neighbor interactions. What are the speed limits on information propagation in quantum systems with power-law interactions, which decay as at distance ? Here, we present a definitive answer to this question for all exponents and all spatial dimensions . Schematically, information takes time at least to propagate a distance . As recent state transfer protocols saturate this bound, our work closes a decades-long hunt for optimal Lieb-Robinson bounds on quantum information dynamics with power-law interactions.
Funding Information
- Advanced Scientific Computing Research
- U.S. Department of Energy (DE-SC0019040, DE-SC0020312, DE-SC0019449)
- National Science Foundation (DMR 1420541, DGE-1840340)
- Army Research Office
- Materials Research Science and Engineering Center, Harvard University
- Alfred P. Sloan Foundation (FG-2020-13795)
- Air Force Office of Scientific Research (FA9550-21-1-0195)
- National Institute of Standards and Technology
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