Quantum-Battery-Powered Geometric Landau-Zener Interferometry

• URL: http://arxiv.org/abs/2605.18108v1
• Date: Mon, 18 May 2026 09:19:07 GMT
• Title: Quantum-Battery-Powered Geometric Landau-Zener Interferometry
• Abstract summary: We study geometric Landau--Zener interferometry powered by a finite quantum battery.<n>The qubit--battery dynamics are described by a Jaynes--Cummings Hamiltonian.<n>We show that reducing photon-number fluctuations alone is not sufficient: geometric control requires a first-order phase reference.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Classical microwave drives are usually treated as ideal phase-coherent work sources for superconducting-qubit control. What if such a drive is replaced by a finite quantum battery. As a demanding benchmark, we consider echo-refocused geometric Landau--Zener interferometry powered by a single quantized bosonic mode. The qubit--battery dynamics are described by a Jaynes--Cummings Hamiltonian, while the echo pulse is retained as a qubit-only refocusing operation that cancels the dynamical phase. In the macroscopic coherent-state limit, the usual classical geometric interferometer is recovered. At finite mean photon number, however, the Jaynes--Cummings coupling generates photon-number-resolved avoided crossings with gaps $Ω_n=2g\sqrt{n}$. The qubit-only echo redistributes amplitudes between neighboring excitation sectors, so the finite-battery protocol is not a single classical interferometer but a coherent sector-resolved quantum evolution. This produces contrast loss, interferogram distortions, and measurable battery back-action. We further show that reducing photon-number fluctuations alone is not sufficient: geometric control requires a first-order phase reference. Geometric Landau--Zener interferometry therefore provides a practical benchmark for certifying phase-coherent quantum-battery energy.

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