Quantum Transport in Disordered Spin Networks: Emergent Timescales and Competing Pathways

• URL: http://arxiv.org/abs/2605.08918v1
• Date: Sat, 09 May 2026 12:38:27 GMT
• Title: Quantum Transport in Disordered Spin Networks: Emergent Timescales and Competing Pathways
• Abstract summary: 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.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Quantum transport in disordered systems poses intriguing fundamental questions about the interplay of disorder, interactions, and decoherence, with important implications for nanoscale energy transfer and quantum information transfer. 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. Using a two-dimensional tight-binding model with dipolar interactions and local dephasing, we demonstrate that geometric heterogeneity leads to hierarchical coupling strengths and pronounced separation of dynamical timescales. By analyzing different metrics for dynamics, we identify distinct relaxation timescales associated with cluster-level equilibration and global equilibration. A minimal three-site model reveals the physical origin of the longest timescale: strong internal hybridization generates an effective detuning that suppresses transfer to other weakly coupled sites, yielding a parametrically enhanced relaxation time in the weak-dephasing regime. We corroborate this picture with nonequilibrium steady-state transport calculations and simulations of disordered spin configurations, demonstrating orders-of-magnitude slowing of relaxation when hierarchical couplings are present. Our results highlight the central role of geometry and connectivity in spin networks and open quantum systems in general, and provide experimentally relevant predictions for relaxation times in small spin baths.

Related papers

• Microscopic QED origin of spin entanglement [0.0]
  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)
  arXiv  Detail & Related papers  (2026-08-10T14:44:51Z)
• Observation of far-from-equilibrium scaling in the transient dynamics of 2D quantum magnets [0.004370410088640301]
  We investigate the quench dynamics of the transverse-field Ising model using programmable Rydberg-atom arrays.<n>A mean-field description effectively reproduces the magnetization oscillations.<n>Results reveal a robust scaling regime governing the transient dynamics of short-range interacting two-dimensional quantum magnets.
  arXiv  Detail & Related papers  (2026-08-07T13:26:13Z)
• 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)
• Spontaneous symmetry breaking and Goldstone modes for deep information propagation [43.66941556185932]
  In physical systems, whenever a continuous symmetry is spontaneously broken, the system possesses excitations called Goldstone modes.<n>In this work, we study deep neural networks whose internal layers are equivariant under a continuous symmetry.<n>We demonstrate, both analytically and empirically, that these degrees of freedom enable coherent signal propagation across depth and recurrent iterations.
  arXiv  Detail & Related papers  (2026-05-14T10:59:28Z)
• Geometry and restoration of the quantum Mpemba effect beyond weak-coupling regime in the spin-boson model [0.0]
  We investigate the quantum Mpemba effect in the spin-boson model.<n>We uncover a simple geometric structure of the effect on the Bloch sphere.<n>Results highlight the role of geometry and system-environment correlations in anomalous quantum relaxation.
  arXiv  Detail & Related papers  (2026-03-18T10:13:48Z)
• From Quantum Chaos to a Reversed Quantum Disentangled Liquid in a Disorder-Free Spin Ladder [0.0]
  We investigate a spin-1/2 ladder with asymmetric XY leg couplings and tunable Ising interactions on the rungs.<n>We identify the microscopic origin of many-body localization (MBL) in this setting.<n>We show the emergence of a reversed quantum disentangled liquid (reversed-QDL), where the light species thermalizes while the heavy species remains localized.
  arXiv  Detail & Related papers  (2026-02-23T08:20:36Z)
• Spin Glass Dynamics on Complex Hardware Topologies: A Bond-Correlated Percolation Approach [41.99844472131922]
  We study the non-exponential relaxation behavior of spin glasses on network architectures relevant to quantum annealing hardware.<n>This framework enables a more comprehensive characterization of spin-glass energy landscapes.
  arXiv  Detail & Related papers  (2025-10-28T18:16:59Z)
• Direct probing of the simulation complexity of open quantum many-body dynamics [42.085941481155295]
  We study the role of dissipation in simulating open-system dynamics using both quantum and classical methods.<n>Our results show that dissipation affects correlation length and mixing time in distinct ways at intermediate and long timescales.
  arXiv  Detail & Related papers  (2025-08-27T15:14:36Z)
• Quantum channel for modeling spin-motion dephasing in Rydberg chains [44.99833362998488]
  We introduce a quantum channel to model the dissipative dynamics resulting from the coupling between spin and motional degrees of freedom in chains of neutral atoms with Rydberg interactions.<n>We benchmark the accuracy of our approach against exact diagonalization for small systems, identifying its regime of validity and the onset of perturbative breakdown.<n>We then apply the quantum channel to compute fidelity loss during transport of single-spin excitations across extended Rydberg chains in intractable regimes via exact diagonalization.
  arXiv  Detail & Related papers  (2025-06-30T17:37:38Z)
• Tailoring transport in quantum spin chains via disorder and collisions [41.94295877935867]
  We investigate the interplay of disorder and time-homogeneous collisional noise in shaping the transport dynamics of anisotropic XXZZ spin chain.<n>We find that space-homogeneous and low-rate collisions can shape regions where localization sets in the form of subsequent plateaus.<n>Our findings can be applied to design stroboscopic protocols where sequences of transport and localization can be tailored.
  arXiv  Detail & Related papers  (2025-02-21T15:11:58Z)
• Nonequilibrium relaxation exponentially delays the onset of quantum diffusion [0.0]
  We exploit a recent breakthrough that generalizes the concept of memory beyond its conventional temporal meaning to also encompass space. We employ the dynamics of small lattices over short times to predict the dynamics of thermodynamically large lattices over arbitrarily long timescales. We also compare transport in 1D and 2D systems to investigate the effect of dimension in polaron migration physics.
  arXiv  Detail & Related papers  (2024-11-26T01:09:23Z)
• Continuous Symmetry Breaking in a Trapped-Ion Spin Chain [3.861651032981608]
  One-dimensional systems exhibiting a continuous symmetry can host quantum phases of matter with true long-range order. We use a one-dimensional trapped-ion quantum simulator to prepare states with long-range spin order that extends over the system size of up to $23$ spins. This work opens an avenue to study new quantum phases and out-of-equilibrium dynamics in low-dimensional systems.
  arXiv  Detail & Related papers  (2022-11-02T16:59:18Z)
• Observation of anisotropy-independent magnetization dynamics in spatially disordered Heisenberg spin systems [0.0]
  We experimentally observe robust features in the magnetization relaxation dynamics of disordered Heisenberg XX-, XXZ- and Ising Hamiltonians. In numerical simulations of small systems, we show that these pairs of spins constitute approximate local integrals of motion.
  arXiv  Detail & Related papers  (2022-09-16T17:44:49Z)
• 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)

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.