Absolutely Stable Spatiotemporal Order in Noisy Quantum Systems
ORAL · Invited
Abstract
In the NISQ (noisy intermediate scale quantum) era, creative applications of quantum circuits are essential for harnessing the promise of quantum computation. In this talk, I will discuss theoretical work [1] that shows that quantum circuits can exhibit discrete time-crystalline (DTC) behavior even in an intrinsically noisy limit. The relevant protocol combines projective measurements and feedback to stabilize spatiotemporal order, making it highly robust to noise, and exploits a link with classical cellular automata. I will also show that this protocol can be viewed as defining a particular type of Lindblad dynamics. If there is time, I will also present some general results on how analog quantum simulators can be used to generate "targeted Lindblad evolution" for quantum state preparation,
*I acknowledge support from UK Engineering and Physical Sciences Research Council Grant No. EP/S020527/1. Some of the work on which this abstract was based received support from an ICTS-Simons Early Career Faculty Fellowship to Shtitadhi Roy, via a grant from the Simons Foundation (677895, R. G.)
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Publication: [1] Absolutely stable spatiotemporal order in noisy quantum systems, M. McGinley, S. Roy, and S. A. Parameswaran, Phys. Rev. Lett. 129, 090404 (2022).
[2] Provably efficient quantum thermal state preparation via local driving, D. Hahn, S.A. Parameswaran, and B. Placke, arXiv:2505.22816 (2025).
Presenters
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Siddharth A Parameswaran
- Oxford University
- University of Oxford