Robust spin-squeezing on quantum networks: the lesson from universality

• URL: http://arxiv.org/abs/2605.03032v1
• Date: Mon, 04 May 2026 18:02:05 GMT
• Title: Robust spin-squeezing on quantum networks: the lesson from universality
• Abstract summary: In quantum networks, the scaling of the spin-squeezing critical point emerges from a nontrivial interplay between xy-ferromagnetic universality and percolation.<n>We apply this general theoretical framework to several experimental scenarios and discuss sharp and experimentally relevant conditions for achieving robust metrological gain on generic inhomogeneous structures.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: We establish the conditions under which scalable spin squeezing can be achieved in interacting spin ensembles embedded in arbitrary, inhomogeneous network geometries. We identify two different forms of squeezing: OAT-like scalable squeezing is governed solely by the universal properties of the interaction graph and is controlled by its spectral dimension. In critical squeezing, on the other hand, the value of the spectral dimension only furnishes the necessary condition for scalable metrological gain, while the sufficient condition requires the model to lie below the symmetry breaking transition. Therefore, in quantum networks, the scaling of the spin-squeezing critical point emerges from a nontrivial interplay between xy-ferromagnetic universality and percolation universality. We apply this general theoretical framework to several experimental scenarios and discuss sharp and experimentally relevant conditions for achieving robust metrological gain on generic inhomogeneous structures, giving a unifying perspective for designing scalable quantum sensors across diverse quantum simulation platforms.

Related papers

• Universal Driven Critical Dynamics of Entanglement Entropy [3.848481893131956]
  We establish a universal finite-time scaling theory for the nonequilibrium dynamics of quantum entanglement.<n>We find that the corner entanglement accurately obeys a universal driven scaling governed by the driving rate and system size.<n>These results generalize the KZM from local observables to the intrinsic nonlocal quantum information measures.
  arXiv  Detail & Related papers  (2026-09-03T13:46:13Z)
• Observation of magnetic quantum phase crossovers in a semiconductor spin ladder [30.296977335549926]
  We realize a programmable Heisenberg spin ladder in a half-filled germanium quantum dot array.<n>Under a fixed magnetic field, we map the rung-singlet, canted antiferromagnetic, and fully polarized phases.<n>Our results establish germanium quantum dot arrays as a controllable platform for quantum magnetism.
  arXiv  Detail & Related papers  (2026-08-18T13:50:44Z)
• Learning Topological Quantum Phases from Limited Subsystems [35.18016233072556]
  We introduce a data-efficient supervised learning framework that recognizes quantum phases from small subsystems.<n>We benchmark our framework with the classification of the phase diagrams of two spin models on one-dimensional lattices.
  arXiv  Detail & Related papers  (2026-07-12T08:43:01Z)
• 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)
• Universal Analytical Design for Perfect Chiral Circulation in Arbitrary Rings: Triangular Realizations via Floquet and Anyonic Physics [0.0]
  We prove that for translationally invariant $N$-site rings, an equidistant energy spectrum is the necessary and sufficient condition for such circulation.<n>We provide an analytical, transparent design framework for perfect chiral circulation applicable to diverse platforms.
  arXiv  Detail & Related papers  (2026-05-04T02:47:22Z)
• Generalized stochastic spin-wave theory for open quantum spin systems [6.258703171051429]
  We propose a semiclassical framework for solving open quantum dynamics in driven-dissipative spin systems.<n>Our framework provides a powerful toolbox for the efficient description of non-equilibrium dynamics and many-body phases in spin systems.
  arXiv  Detail & Related papers  (2026-04-23T11:53:46Z)
• Continuum field theory of matchgate tensor network ensembles [36.94429692322632]
  We develop a continuum description for random ensembles of two-dimensional fermionic matchgate tensor networks.<n>As a diagnostic of the resulting universal physics, we analyze disorder-averaged moments of fermionic two-point functions.<n>We show that disorder drives universal long-distance behavior governed by a nonlinear sigma-model of symmetry class D with a topological term.
  arXiv  Detail & Related papers  (2026-03-06T12:15:35Z)
• Coherent Quantum Evaluation of Collider Amplitudes for Effective Field Theory Constraints [15.177973842316527]
  We present a hybrid quantum-classical framework for computing leading-order helicity amplitudes for $e+e-to ell+ell-$ scattering on gate-based quantum hardware.<n>We use the resulting cross sections to constrain both Standard Model couplings and effective field theory operators.
  arXiv  Detail & Related papers  (2026-02-24T19:33:17Z)
• Engineering quantum criticality and dynamics on an analog-digital simulator [26.76525389323686]
  We use coherent mapping between the Rydberg and hyperfine qubits in a neutral atom array simulator to engineer and probe complex quantum dynamics.<n>We first demonstrate dynamical engineering of ring-exchange and particle hopping dynamics via Floquet driving.<n>We employ closed-loop optimization to target an out-of-equilibrium critical quantum spin liquid of the Rokhsar-Kivelson type.
  arXiv  Detail & Related papers  (2026-02-20T19:00:00Z)
• Universality of Shallow Global Quenches in Critical Spin Chains [0.039089069256361735]
  We study the dynamics of local observables from two types of readily-accessible initial conditions.<n>We identify universal scaling collapses and scaling functions in both cases.<n>For the finite-temperature quenches, we determine a regime in which the conformal field theory results are recovered.
  arXiv  Detail & Related papers  (2025-09-26T18:00:00Z)
• Probing critical phenomena in open quantum systems using atom arrays [3.365378662696971]
  At quantum critical points, correlations decay as a power law, with exponents determined by a set of universal scaling dimensions. Here, we employ a Rydberg quantum simulator to adiabatically prepare critical ground states of both a one-dimensional ring and a two-dimensional square lattice. By accounting for and tuning the openness of our quantum system, we are able to directly observe power-law correlations and extract the corresponding scaling dimensions.
  arXiv  Detail & Related papers  (2024-02-23T15:21:38Z)
• Scalable Spin Squeezing from Finite Temperature Easy-plane Magnetism [26.584014467399378]
  We conjecture that any Hamiltonian exhibiting finite temperature, easy-plane ferromagnetism can be used to generate scalable spin squeezing. Our results provide insights into the landscape of Hamiltonians that can be used to generate metrologically useful quantum states.
  arXiv  Detail & Related papers  (2023-01-23T18:59:59Z)
• Finite-size criticality in fully connected spin models on superconducting quantum hardware [0.0]
  We exploit the new resources offered by quantum algorithms to detect the quantum critical behaviour of fully connected spin$-1/2$ models. We propose a method based on variational algorithms run on superconducting transmon qubits.
  arXiv  Detail & Related papers  (2022-08-04T16:00:34Z)
• Observation of critical phase transition in a generalized Aubry-Andr\'e-Harper model on a superconducting quantum processor with tunable couplers [22.968091212322523]
  Quantum simulation enables study of many-body systems in non-equilibrium. We simulate the one-dimensional generalized Aubry-Andr'e-Harper model for three different phases. We observe the spin transport for initial single- and multi-excitation states in different phases.
  arXiv  Detail & Related papers  (2022-06-27T08:22:19Z)
• Quantum transport and localization in 1d and 2d tight-binding lattices [39.26291658500249]
  Particle transport and localization phenomena in condensed-matter systems can be modeled using a tight-binding lattice Hamiltonian. Here, we experimentally study quantum transport in one-dimensional and two-dimensional tight-binding lattices, emulated by a fully controllable $3 times 3$ array of superconducting qubits.
  arXiv  Detail & Related papers  (2021-07-11T12:36:12Z)

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.