Heralded Generation of Multipartite Free-Electron W-State Entanglement

• URL: http://arxiv.org/abs/2605.17802v1
• Date: Mon, 18 May 2026 03:25:42 GMT
• Title: Heralded Generation of Multipartite Free-Electron W-State Entanglement
• Abstract summary: We propose a heralded protocol for generating multipartite free-electron entanglement from atomic $W_N$ resources.<n>For uniform couplings and common detuning, the dynamics is solved analytically within the rotating-wave approximation.<n>The heralded state retains the multipartite entanglement structure of the atomic resource.
• Score: 12.994065974934657
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: We propose a heralded protocol for generating multipartite free-electron entanglement from atomic $W_N$ resources in a sideband-resolved interaction regime. The scheme consists of $N$ independent electron--atom interaction arms, where each free electron couples locally to one two-level system. For uniform couplings and common detuning, the dynamics is solved analytically within the rotating-wave approximation. Projecting the atoms onto the all-ground state maps the initial atomic excitation manifold onto the electronic upper-sideband manifold and prepares an exact $N$-electron $W_N$-type state. The heralding probability is obtained in closed form for resonant and detuned regimes. At resonance, the optimal success probability obeys the large-$N$ scaling $P_{G_N}^{\max}\sim e^{-1}/N$. The heralded state retains the multipartite entanglement structure of the atomic resource, as shown for arbitrary $N$ and illustrated explicitly for $N=3$. Detuning, weak symmetry breaking, beyond-rotating-wave corrections, and Gaussian coupling envelopes are discussed. The protocol provides a scalable route toward multipartite free-electron entanglement generation from localized atomic resources within quantum electron optics.

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