Floquet-engineering counterdiabatic protocols in quantum many-body systems
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Authors
Claeys, Pieter W.
Pandey, Mohit
Sels, Dries
Polkovnikov, Anatoli
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Pieter W. Claeys, Mohit Pandey, Dries Sels, Anatoli Polkovnikov. "Floquet-Engineering Counterdiabatic Protocols in Quantum Many-Body Systems." Physical Review Letters, Volume 123, Issue 9, https://doi.org/10.1103/physrevlett.123.090602
Abstract
Counterdiabatic (CD) driving presents a way of generating adiabatic dynamics at an arbitrary pace, where excitations due to nonadiabaticity are exactly compensated by adding an auxiliary driving term to the Hamiltonian. While this CD term is theoretically known and given by the adiabatic gauge potential, obtaining and implementing this potential in many-body systems is a formidable task, requiring knowledge of the spectral properties of the instantaneous Hamiltonians and control of highly nonlocal multibody interactions. We show how an approximate gauge potential can be systematically built up as a series of nested commutators, remaining well defined in the thermodynamic limit. Furthermore, the resulting CD driving protocols can be realized up to arbitrary order without leaving the available control space using tools from periodically driven (Floquet) systems. This is illustrated on few- and many-body quantum systems, where the resulting Floquet protocols significantly suppress dissipation and provide a drastic increase in fidelity.
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"© 2019 American Physical Society. The final published version of this article appears in OpenBU by permission of the publisher."