Dresden 2026 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 87: Many-body Quantum Dynamics II (joint session DY/TT)

TT 87.5: Talk

Thursday, March 12, 2026, 16:00–16:15, HÜL/S186

Harnessing spin qubit decoherence to probe strongly interacting quantum systems — Marcin Płodzień¹, •Sambunath Das², Maciej Lewenstein^1,3, Christina Psaroudaki⁴, and Katarzyna Roszak² — ¹Institut de Ciencies Fotoniques, The Barcelona Institute of Science and Technology, 08860 Castelldefels (Barcelona), Spain — ²Institute of Physics of the Czech Academy of Sciences, Na Slovance 1999/2, 182 00 Prague, Czech Republic — ³Passeig Lluis Companys 23, 08010 Barcelona, Spain — ⁴Laboratoire de Physique de l' École Normale Supérieure, Université PSL, CNRS, Sorbonne Université, Université de Paris, 75005 Paris, France

Using a mobile qubit as a probe to study the properties of a larger quantum system is a novel technique that leverages the quantum nature of the probe, the system under study, and the interaction between them [1-3]. By analyzing qubit decoherence, one accesses to properties that are difficult to measure classically. We apply this method to the anisotropic Heisenberg XXZ spin-1/2 chain, an archetypal example of strongly correlated system, and show that qubit dynamics encode key system parameters, including quantum phase transitions and perturbation propagation velocity [4]. This demonstrates the effectiveness of small quantum probes for exploring large quantum systems.

References: 1. F. Casola, T. van der Sar et al, Nat. Rev. Mat. 3, 17088 (2018). 2. J. F. Rodriguez-Nieva, K. Agarwal et al. Phys. Rev. B 98, 195433 (2018). 3. S. Chatterjee, J. F. Rodriguez-Nieva et al, Phy. Rev. B 99, 104425 (2019). 4. M Płodzień, S. Das et al, Phy. Rev. B 111, L161115 (2025).

Keywords: qubit; decoherence; chain; strongly correlated system; quantum phase transition