Charging a Dimerized Quantum XY Chain

• URL: http://arxiv.org/abs/2502.06503v1
• Date: Mon, 10 Feb 2025 14:21:04 GMT
• Title: Charging a Dimerized Quantum XY Chain
• Authors: Riccardo Grazi, Fabio Cavaliere, Niccolò Traverso Ziani, Dario Ferraro,
• Abstract summary: Quantum batteries are designed to store energy and release it on demand. How do quantum many-body systems work as quantum batteries? We analyze a dimerized quantum XY chain in a transverse field as a prototype of an energy storage device.
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• Abstract: Quantum batteries are quantum systems designed to store energy and release it on demand. The optimization of their performance is an intensively studied topic within the realm of quantum technologies. Such optimization forces the question: how do quantum many-body systems work as quantum batteries? To address this issue, we rely on symmetry and symmetry breaking via quantum phase transitions. Specifically, we analyze a dimerized quantum XY chain in a transverse field as a prototype of an energy storage device. This model, which is characterized by ground states with different symmetries depending on the Hamiltonian parameters, can be mapped onto a spinless fermionic chain with superconducting correlations, displaying a rich quantum phase diagram. We show that the stored energy strongly depends on the quantum phase diagram of the model when large charging times are considered.

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