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Sebastian Deffner

As seen in: Nature, arXiv, How Stuff Works, MDPI, New Scientist, The Conversation, Agenda (World Economic Forum), Phys.org, Salon, The Astronomical Journal and
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Articles

Variational Gibbs state preparation on trapped-ion devices

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By Reece Robertson, Mirko Consiglio, Josey Stevens, Emery Doucet, Sebastian Deffner, Tony J. G. Apollaro
| Nature Verified
Abstract We implement a variational quantum algorithm for Gibbs state preparation of a transverse-field Ising model on IonQ’s quantum computers. To this end, we train the variational parameters via classical simulation and perform state tomography on the quantum devices to evaluate the fidelity of the prepared Gibbs state. As a main result, we find that fidelity decreases (non-monotonically) as a function of the inverse temperature β of the system.
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Editorial: Statistical and Nonlinear Physics Crosses a Threshold

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By Sebastian Deffner, Douglas J. Durian, Wolfgang Losert, Narayanan Menon
| American Physical Society
Phys. Rev. E 112, 020001– Published 13 August, 2025 Reuse & Permissions Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI. ©2025 American Physical Society
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Classifying Two-Body Hamiltonians for Quantum Darwinism

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By Sebastian Deffner, Emery Doucet
| Physical Review B
A classical understanding of measurement is entirely sufficient to explain the everyday world. Given that the Universe is fundamentally quantum, this is somewhat surprising. There must be some mechanism by which classical reality is an emergent property of the quantum Universe. A well-developed framework to explain this emergence is quantum Darwinism.
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