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QI: Fachverband Quanteninformation

QI 11: Quantum Thermodynamics

QI 11.1: Vortrag

Dienstag, 19. März 2024, 09:30–09:45, HFT-TA 441

Fermionic one-body entanglement as a thermodynamic resource — •Krzysztof Ptaszyński^1,2 and Massimiliano Esposito¹ — ¹Complex Systems and Statistical Mechanics, Department of Physics and Materials Science, University of Luxembourg, L-1511 Luxembourg, Luxembourg — ²Institute of Molecular Physics, Polish Academy of Sciences, Mariana Smoluchowskiego 17, 60-179 Poznań, Poland

There is a controversy about whether a pure state of a single fermion delocalized between two modes (e.g., quantum dots) should be regarded entangled or not, that is, whether the quantum correlations encoded in such a state are operationally accessible and useful as a resource. This has been questioned on the basis that such an entanglement cannot be accessed by local operations on individual modes due to the parity superselection rule which constrains the set of physical observables. In other words, one cannot observe violations of Bell's inequality.

Here we approach this issue from the perspective of quantum thermodynamics [1]. We show that a single-particle fermionic state can be used in open-system thermodynamic processes, enabling one to perform tasks forbidden for separable (non-entangled) states. Therefore, its entanglement is a genuine quantum resource with a clear physical manifestation. Our work thus shows that quantum thermodynamics may be a useful theoretical framework to shed light on unsolved problems of quantum information theory.

[1] Phys. Rev. Lett. 130, 150201 (2023)

Keywords: Quantum entanglement; Quantum thermodynamics