Discrete time-crystalline order enabled by quantum many-body scars: entanglement steering via periodic driving

• URL: http://arxiv.org/abs/2102.13160v1
• Date: Thu, 25 Feb 2021 20:41:47 GMT
• Title: Discrete time-crystalline order enabled by quantum many-body scars: entanglement steering via periodic driving
• Authors: Nishad Maskara, Alexios A Michailidis, Wen Wei Ho, Dolev Bluvstein, Soonwon Choi, Mikhail D Lukin, Maksym Serbyn
• Abstract summary: We show that coherent revivals associated with quantum many-body scars can be stabilized by periodic driving. Our results suggest a route to controlling entanglement in quantum systems by combining periodic driving with many-body scars.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: The control of many-body quantum dynamics in complex systems is a key challenge in the quest to reliably produce and manipulate large-scale quantum entangled states. Recently, quench experiments in Rydberg atom arrays (Bluvstein et. al., arXiv:2012.12276) demonstrated that coherent revivals associated with quantum many-body scars can be stabilized by periodic driving, generating stable subharmonic responses over a wide parameter regime. We analyze a simple, related model where these phenomena originate from spatiotemporal ordering in an effective Floquet unitary, corresponding to discrete time-crystalline (DTC) behavior in a prethermal regime. Unlike conventional DTC, the subharmonic response exists only for Neel-like initial states, associated with quantum scars. We predict robustness to perturbations and identify emergent timescales that could be observed in future experiments. Our results suggest a route to controlling entanglement in interacting quantum systems by combining periodic driving with many-body scars.

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