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Title: Tuning high-Q nonlinear dynamics in a disordered quantum magnet

Abstract

Quantum states cohere and interfere. Atoms arranged imperfectly in a solid rarely display these properties. Here we demonstrate an exception in a disordered quantum magnet that divides itself into nearly isolated subsystems. We probe these coherent spin clusters by driving the system nonlinearly and measuring the resulting hole in the linear spectral response. The Fano shape of the hole encodes the incoherent lifetime as well as coherent mixing of the localized excitations. For the Ising magnet LiHo0.045Y0.955F4, the quality factor Q for spectral holes can be as high as 100,000. We tune the dynamics by sweeping the Fano mixing parameter q through zero via the ac pump amplitude as well as a dc transverse field. The zero crossing of q is associated with a dissipationless response at the drive frequency. Identifying localized two-level systems in a dense and disordered magnet advances the search for qubit platforms emerging from strongly interacting, many-body systems.

Authors:
 [1];  [1];  [2];  [1]
  1. California Inst. of Technology (CalTech), Pasadena, CA (United States)
  2. ETH Zurich (Switzerland); EPF Lausanne (Switzerland); Paul Scherrer Inst. (PSI), Villigen (Switzerland)
Publication Date:
Research Org.:
California Institute of Technology (CalTech), Pasadena, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI Identifier:
1612260
Grant/Contract Number:  
SC0014866
Resource Type:
Accepted Manuscript
Journal Name:
Nature Communications
Additional Journal Information:
Journal Volume: 10; Journal Issue: 1; Journal ID: ISSN 2041-1723
Publisher:
Nature Publishing Group
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; Science & technology - other topics; Magnetic properties and materials; Phase transitions and critical phenomena

Citation Formats

Silevitch, D. M., Tang, C., Aeppli, G., and Rosenbaum, T. F. Tuning high-Q nonlinear dynamics in a disordered quantum magnet. United States: N. p., 2019. Web. https://doi.org/10.1038/s41467-019-11985-1.
Silevitch, D. M., Tang, C., Aeppli, G., & Rosenbaum, T. F. Tuning high-Q nonlinear dynamics in a disordered quantum magnet. United States. https://doi.org/10.1038/s41467-019-11985-1
Silevitch, D. M., Tang, C., Aeppli, G., and Rosenbaum, T. F. Thu . "Tuning high-Q nonlinear dynamics in a disordered quantum magnet". United States. https://doi.org/10.1038/s41467-019-11985-1. https://www.osti.gov/servlets/purl/1612260.
@article{osti_1612260,
title = {Tuning high-Q nonlinear dynamics in a disordered quantum magnet},
author = {Silevitch, D. M. and Tang, C. and Aeppli, G. and Rosenbaum, T. F.},
abstractNote = {Quantum states cohere and interfere. Atoms arranged imperfectly in a solid rarely display these properties. Here we demonstrate an exception in a disordered quantum magnet that divides itself into nearly isolated subsystems. We probe these coherent spin clusters by driving the system nonlinearly and measuring the resulting hole in the linear spectral response. The Fano shape of the hole encodes the incoherent lifetime as well as coherent mixing of the localized excitations. For the Ising magnet LiHo0.045Y0.955F4, the quality factor Q for spectral holes can be as high as 100,000. We tune the dynamics by sweeping the Fano mixing parameter q through zero via the ac pump amplitude as well as a dc transverse field. The zero crossing of q is associated with a dissipationless response at the drive frequency. Identifying localized two-level systems in a dense and disordered magnet advances the search for qubit platforms emerging from strongly interacting, many-body systems.},
doi = {10.1038/s41467-019-11985-1},
journal = {Nature Communications},
number = 1,
volume = 10,
place = {United States},
year = {2019},
month = {9}
}

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