Robust Nonclassical magnon pair generation and Cauchy-Schwarz inequality violation in a hybrid electromagnonic system

• URL: http://arxiv.org/abs/2608.01741v1
• Date: Mon, 03 Aug 2026 06:09:29 GMT
• Title: Robust Nonclassical magnon pair generation and Cauchy-Schwarz inequality violation in a hybrid electromagnonic system
• Abstract summary: We show that tuning the drive phase produces both magnon blockade and a strong violation of the classical Cauchy--Schwarz inequality.<n>Our results enable phase-controlled magnonic quantum information processing.
• Score: 1.0195618602298684
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Magnonic systems are a promising resource for quantum technologies because of their ability to couple significantly disparate quantum platforms and the generation of nonclassical magnon states through magnon blockade has attracted growing attention. In practice, however magnon blockade relies on a destructive interference that is easily spoiled by fabrication-induced coupling asymmetries. Here we show that the relative phase between two magnon drives acts as an active compensation knob that restores this interference even when the couplings are mismatched. We study two Kittel magnon modes in a hybrid system in which a superconducting qubit coupled to a common cavity mode mediates the inter-mode interaction and we find that tuning the drive phase produces both magnon blockade and a strong violation of the classical Cauchy--Schwarz inequality. We derive the analytic condition for the phase that compensates a given coupling asymmetry and confirm it against exact numerical simulations. The drive phase thereby serves as a control knob that switches the system between classical and quantum regimes. Our results enable phase-controlled magnonic quantum information processing.

Related papers

• Nonlocality-induced critical-length hierarchy from non-Hermitian competition [48.9823527611878]
  In short-range systems formed by two coupled chains, competition leads to the critical-length law $N_csimln D$.<n>Here we show that long-range hoppings fundamentally reorganizes this critical behavior, producing a hierarchy of distinct scaling laws.<n>Our results offer a platform-independent framework testable in programmable topoelectrical circuits, photonic lattices and digital quantum simulators.
  arXiv  Detail & Related papers  (2026-08-03T18:00:18Z)
• Deep Strong light-matter Coupling in 3D Kane Fermions [32.505127447635864]
  Deep strong light-matter coupling represents an extreme non-perturbative regime of quantum electrodynamics.<n>We exploit the ultralow effective mass of Kane fermions to realise Landau polaritons in a bulk mercury cadmium telluride layer coupled to a Fabry-Perot resonator.<n>Despite the nonlinear Landau level structure of relativistic Kane fermions, we show that a diamagnetic $A2$ term naturally emerges and precludes a superradiant phase transition.
  arXiv  Detail & Related papers  (2026-04-30T15:54:18Z)
• Collisional model with dissipative and dephasing baths: Nonadditive effects at strong coupling [39.146761527401424]
  We show that when both baths act concurrently, a strong system-bath coupling gives rise to nonadditive effects in the dynamics.<n>A prominent signature of this nonadditivity is the characteristic it slowing down of population relaxation, driven by the influence of the dephasing bath.
  arXiv  Detail & Related papers  (2025-09-13T21:37:43Z)
• Magic for Hybrid Boson-Fermion Systems: A Grassmann Phase-Space Approach [42.13843953705695]
  Non-stabilizerness enables universality beyond Gaussian/Clifford dynamics.<n>No resource theory exists for systems combining bosonic and fermionic modes.<n>We develop a phase-space framework defining hybrid magic via the $L_p$ norm of a hybrid Wigner function.
  arXiv  Detail & Related papers  (2025-09-05T17:22:54Z)
• Magnon Blockade with Skyrmion Qubit-Magnon Coupling in a Hybrid Quantum System [12.719202249840517]
  Magnon blockade is a fundamental quantum phenomenon for generating single-magnon state.<n>We propose a theoretical scheme to generate the magnon blockade in a hybrid system consisting of a YIG micromagnet and a skyrmion.
  arXiv  Detail & Related papers  (2024-12-16T01:18:10Z)
• Dispersive Non-reciprocity between a Qubit and a Cavity [24.911532779175175]
  We present an experimental study of a non-reciprocal dispersive-type interaction between a transmon qubit and a superconducting cavity. We show that the qubit-cavity dynamics is well-described in a wide parameter regime by a simple non-reciprocal master-equation model.
  arXiv  Detail & Related papers  (2023-07-07T17:19:18Z)
• Resolving nonclassical magnon composition of a magnetic ground state via a qubit [44.99833362998488]
  We show that a direct dispersive coupling between a qubit and a noneigenmode magnon enables detecting the magnonic number states' quantum superposition. This unique coupling is found to enable control over the equilibrium magnon squeezing and a deterministic generation of squeezed even Fock states.
  arXiv  Detail & Related papers  (2023-06-08T09:30:04Z)
• Quantum interference induced magnon blockade and antibunching in a hybrid quantum system [0.0]
  We study the phenomena of quantum interference assisted magnon blockade and magnon antibunching in a weakly interacting hybrid ferromagnet-superconductor system. The magnon excitations in two yttrium iron garnet spheres are indirectly coupled to a superconducting qubit through microwave cavity modes of two mutually perpendicular cavities.
  arXiv  Detail & Related papers  (2023-05-15T08:40:50Z)
• Magnon blockade in magnon-qubit systems [0.0]
  A hybrid system by the direct interaction between a magnon mode and a superconducting transmon qubit is used to realize a high-degree blockade for magnon. It is a fundamental way toward quantum manipulation the level of a single magnon and preparation of single magnon sources.
  arXiv  Detail & Related papers  (2023-03-24T06:15:40Z)
• Reminiscence of classical chaos in driven transmons [117.851325578242]
  We show that even off-resonant drives can cause strong modifications to the structure of the transmon spectrum rendering a large part of it chaotic. Results lead to a photon number threshold characterizing the appearance of chaos-induced quantum demolition effects.
  arXiv  Detail & Related papers  (2022-07-19T16:04:46Z)
• Dissipation-induced nonreciprocal magnon blockade in a magnon-based hybrid system [6.059733930380898]
  We propose an experimentally realizable nonreciprocal magnonic device at the single-magnon level. Coherent qubit-magnon coupling, mediated by virtual photons in a microwave cavity, leads to the energy-level anharmonicity of the composite modes. Dissipative counterpart, induced by traveling microwaves in a waveguide, yields inhomogeneous broadenings of the energy levels.
  arXiv  Detail & Related papers  (2021-12-04T14:49:09Z)
• Superconducting coupler with exponentially large on-off ratio [68.8204255655161]
  Tunable two-qubit couplers offer an avenue to mitigate errors in multiqubit superconducting quantum processors. Most couplers operate in a narrow frequency band and target specific couplings, such as the spurious $ZZ$ interaction. We introduce a superconducting coupler that alleviates these limitations by suppressing all two-qubit interactions with an exponentially large on-off ratio.
  arXiv  Detail & Related papers  (2021-07-21T03:03:13Z)
• Cavity magnon-polaritons in cuprate parent compounds [0.0]
  cavity control of quantum matter may offer new ways to study and manipulate many-body systems. We propose a scheme for coupling Terahertz resonators to the antiferromagnetic fluctuations in a cuprate parent compound. We find a strong, but heavily damped, bimagnon-cavity interaction which produces highly asymmetric cavity line-shapes.
  arXiv  Detail & Related papers  (2021-06-15T01:19:57Z)

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.