Microscopic QED origin of spin entanglement

• URL: http://arxiv.org/abs/2608.09670v1
• Date: Mon, 10 Aug 2026 14:44:51 GMT
• Title: Microscopic QED origin of spin entanglement
• Abstract summary: We study effective spin interactions arising from quantum electrodynamics (QED) scattering between localized fermionic spins.<n>For two qubits in the nonrelativistic regime, the resulting interaction takes a tensor dipolar form with a decay proportional to (R-3)
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: We study effective spin interactions arising from quantum electrodynamics (QED) scattering between localized fermionic spins. By integrating out photon and mediator fields, the dynamics reduce to an effective spin Hamiltonian. For two qubits in the nonrelativistic regime, the resulting interaction takes a tensor dipolar form with an asymptotic decay proportional to \(R^{-3}\). We obtain analytical expressions for the entanglement negativity, highlighting its dependence on coupling strength and spatial configuration. We then examine a setup in which two bath spins interact via a sequential exchange with an intermediate fermionic mediator. At the perturbative order considered, the mediator remains unentangled and induces an effective bath--bath interaction with stronger spatial suppression than in the photon-mediated case. Extending the construction to an \(N\)-spin setting yields an effective interaction network mediated by virtual exchange processes, which can support the generation of multipartite entanglement across the system.

Related papers

• Quantum fluctuations and chaos in fully connected spin models [84.0552206158625]
  We investigate beyond-mean-field dynamics in a fully connected $mathrmSU(3)$ spin-exchange model.<n>Using the two-particle irreducible (2PI) effective action formalism, we derive equations of motion that account for higher-order correlations generated by interactions.<n>Our results show that an accurate treatment of fluctuations is essential for describing macroscopic dynamics in quantum many-body systems.
  arXiv  Detail & Related papers  (2026-05-26T15:53:43Z)
• Quantum Transport in Disordered Spin Networks: Emergent Timescales and Competing Pathways [0.0]
  Quantum transport in disordered systems poses intriguing fundamental questions about the interplay of disorder, interactions, and decoherence.<n>Here, we investigate the emergence of multiple transport timescales in the dissipative dynamics of a spin impurity coupled to a small, spatially disordered network of spins.
  arXiv  Detail & Related papers  (2026-05-09T12:38:27Z)
• Two-mode Squeezing in Floquet Engineered Power-law Interacting Spin Models [0.0]
  We find scalable generation of entanglement in the form of two-mode squeezing between the layers can generically be achieved in powerlaw models. spatially-temporally engineered interactions allow to significantly increase the generated entanglement and in fact achieve Heisenberg limited scaling.
  arXiv  Detail & Related papers  (2024-02-28T19:00:06Z)
• Steering spin fluctuations in lattice systems via two-tone Floquet engineering [1.2289361708127877]
  We consider a one-dimensional spin-1/2 lattice with periodically modulated spin exchanges using parametric resonances.<n>The stroboscopic dynamics generated from distributed spin exchange modulations lead to spin pair fluctuations reaching quasi-maximally correlated states.<n>We present a protocol to control the interacting many-body dynamics, producing spatial and temporal localization of correlated spin pairs.
  arXiv  Detail & Related papers  (2024-01-08T13:42:55Z)
• Probing dynamics of a two-dimensional dipolar spin ensemble using single qubit sensor [62.997667081978825]
  We experimentally investigate individual spin dynamics in a two-dimensional ensemble of electron spins on the surface of a diamond crystal. We show that this anomalously slow relaxation rate is due to the presence of strong dynamical disorder. Our work paves the way towards microscopic study and control of quantum thermalization in strongly interacting disordered spin ensembles.
  arXiv  Detail & Related papers  (2022-07-21T18:00:17Z)
• Programmable N-body interactions with trapped ions [0.0]
  Trapped atomic ion qubits are a powerful quantum platform for quantum computation and simulation. We formulate and analyze a mechanism that extends the standard Molmer-Sorensen pairwise entangling gate. We show that spin-dependent optical forces applied at twice the motional frequency generate a coordinate-transformation of the collective ion motion in phase-space.
  arXiv  Detail & Related papers  (2022-07-21T15:49:52Z)
• Tuning long-range fermion-mediated interactions in cold-atom quantum simulators [68.8204255655161]
  Engineering long-range interactions in cold-atom quantum simulators can lead to exotic quantum many-body behavior. Here, we propose several tuning knobs, accessible in current experimental platforms, that allow to further control the range and shape of the mediated interactions.
  arXiv  Detail & Related papers  (2022-03-31T13:32:12Z)
• Anisotropic electron-nuclear interactions in a rotating quantum spin bath [55.41644538483948]
  Spin-bath interactions are strongly anisotropic, and rapid physical rotation has long been used in solid-state nuclear magnetic resonance. We show that the interaction between electron spins of nitrogen-vacancy centers and a bath of $13$C nuclear spins introduces decoherence into the system. Our findings offer new insights into the use of physical rotation for quantum control with implications for quantum systems having motional and rotational degrees of freedom that are not fixed.
  arXiv  Detail & Related papers  (2021-05-16T06:15:00Z)
• Light-matter interactions near photonic Weyl points [68.8204255655161]
  Weyl photons appear when two three-dimensional photonic bands with linear dispersion are degenerated at a single momentum point, labeled as Weyl point. We analyze the dynamics of a single quantum emitter coupled to a Weyl photonic bath as a function of its detuning with respect to the Weyl point.
  arXiv  Detail & Related papers  (2020-12-23T18:51:13Z)
• Optically pumped spin polarization as a probe of many-body thermalization [50.591267188664666]
  We study the spin diffusion dynamics of 13C in diamond, which we dynamically polarize at room temperature via optical spin pumping of engineered color centers. We find good thermal contact throughout the nuclear spin bath, virtually independent of the hyperfine coupling strength. Our results open intriguing opportunities to study the onset of thermalization in a system by controlling the internal interactions within the bath.
  arXiv  Detail & Related papers  (2020-05-01T23:16:33Z)

This list is automatically generated from the titles and abstracts of the papers in this site.

This site does not guarantee the quality of this site (including all information) and is not responsible for any consequences.