General framework for quantifying entanglement production in ultracold molecular collisions and chemical reactions

• URL: http://arxiv.org/abs/2601.17144v1
• Date: Fri, 23 Jan 2026 19:48:34 GMT
• Title: General framework for quantifying entanglement production in ultracold molecular collisions and chemical reactions
• Authors: Adrien Devolder, Paul Brumer, Timur Tscherbul,
• Abstract summary: Entanglement, a defining feature of quantum mechanics, arises naturally from interactions between molecular systems.<n>Here, we show that coupling between the external (motional) and internal degrees of freedom of the colliding molecules generates diverse forms of product-state entanglement.<n>We develop a general theoretical framework to quantify these entanglement forms directly from scattering S-matrix elements.<n>Although applicable at arbitrary collision energies, the formalism is illustrated in the ultracold and cold regimes for inelastic Rb+SrF and Rb+Sr$+$ collisions.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Entanglement, a defining feature of quantum mechanics, arises naturally from interactions between molecular systems. Yet the precise nature and quantification of entanglement in the products of molecular collisions and reactions remain largely unexplored. Here, we show that coupling between the external (motional) and internal degrees of freedom of the colliding molecules generates diverse forms of product-state entanglement: discrete-discrete, continuum-continuum, and hybrid discrete-continuum. We develop a general theoretical framework to quantify these entanglement forms directly from scattering S-matrix elements and identify a novel class of entangled states-multimode hybrid cat states, that exhibit multimode discrete-continuum entanglement. Although applicable at arbitrary collision energies, the formalism is illustrated in the ultracold and cold regimes for inelastic Rb+SrF and Rb+Sr$^+$ collisions, as well as the chemical reaction F+HD $\rightarrow$ HF+D, DF+H. We demonstrate that entanglement can be efficiently controlled near magnetic Feshbach resonances, paving the way for precise magnetic control of product-state entanglement generation in ultracold molecular collisions.

Related papers

• Torsional-GFN: a conditional conformation generator for small molecules [75.91029322687771]
  We introduce a conditional GFlowNet specifically designed to sample conformations of molecules proportionally to their Boltzmann distribution.<n>Our work presents a promising avenue for scaling the proposed approach to larger molecular systems.
  arXiv  Detail & Related papers  (2025-07-15T21:53:25Z)
• Theory of itinerant collisional spin dynamics in nondegenerate molecular gases [0.0]
  We study the itinerant dynamics of ultracold but nondegenerate polar molecules with a spin-$1/2$ degree of freedom encoded into two of their electric field dressed rotational states.<n>We show that loss can be near completely suppressed in all collision channels via electric field confinement-induced collisional shielding.<n>This work establishes a bridge between the domains of ultracold molecular collisions and many-body spin physics.
  arXiv  Detail & Related papers  (2025-05-28T02:18:22Z)
• Analytic Model Reveals Local Molecular Polarizability Changes Induced by Collective Strong Coupling in Optical Cavities [0.8642326601683299]
  We present non-perturbative analytic results for a model system consisting of an ensemble of $N$ harmonic molecules under vibrational strong coupling. We discover that the electronic molecular polarizabilities are modified even in the case of vanishingly small single-molecule couplings.
  arXiv  Detail & Related papers  (2024-01-29T18:13:43Z)
• Rydberg molecules bound by strong light fields [0.0]
  We show that Rydberg macrodimers, weakly bound pairs of Rydberg atoms, can form bound states with the continuum of free motional states. This is enabled by the unique combination of extraordinarily slow vibrational motion in the molecular state and the optical coupling to a non-interacting continuum. Our results present an intriguing mechanism to control decoherence and bind multiatomic molecules using strong light-matter interactions.
  arXiv  Detail & Related papers  (2024-01-10T12:51:51Z)
• Collective Polaritonic Effects on Chemical Dynamics Suppressed by Disorder [0.0]
  We present a powerful formalism, disordered collective dynamics using truncated equations (d-CUT-E) Using d-CUT-E we conclude that strong coupling, as evaluated from linear optical spectra, can be a poor proxy for polariton chemistry.
  arXiv  Detail & Related papers  (2023-08-07T23:45:14Z)
• DiffBP: Generative Diffusion of 3D Molecules for Target Protein Binding [51.970607704953096]
  Previous works usually generate atoms in an auto-regressive way, where element types and 3D coordinates of atoms are generated one by one. In real-world molecular systems, the interactions among atoms in an entire molecule are global, leading to the energy function pair-coupled among atoms. In this work, a generative diffusion model for molecular 3D structures based on target proteins is established, at a full-atom level in a non-autoregressive way.
  arXiv  Detail & Related papers  (2022-11-21T07:02:15Z)
• Sensing of magnetic field effects in radical-pair reactions using a quantum sensor [50.591267188664666]
  Magnetic field effects (MFE) in certain chemical reactions have been well established in the last five decades. We employ elaborate and realistic models of radical-pairs, considering its coupling to the local spin environment and the sensor. For two model systems, we derive signals of MFE detectable even in the weak coupling regime between radical-pair and NV quantum sensor.
  arXiv  Detail & Related papers  (2022-09-28T12:56:15Z)
• Engineering random spin models with atoms in a high-finesse cavity [8.787025970442755]
  We realise an all-to-all interacting, disordered spin system by subjecting an atomic cloud in a cavity to a controllable light shift. By probing the low-energy excitations of the system, we explore the competition of interactions with disorder across a broad parameter range. Results present significant steps towards freely programmable cavity-mediated interactions for the design of arbitrary spin Hamiltonians.
  arXiv  Detail & Related papers  (2022-08-19T16:13:58Z)
• Formation of robust bound states of interacting microwave photons [148.37607455646454]
  One of the hallmarks of interacting systems is the formation of multi-particle bound states. We develop a high fidelity parameterizable fSim gate that implements the periodic quantum circuit of the spin-1/2 XXZ model. By placing microwave photons in adjacent qubit sites, we study the propagation of these excitations and observe their bound nature for up to 5 photons.
  arXiv  Detail & Related papers  (2022-06-10T17:52:29Z)
• Dispersive readout of molecular spin qudits [68.8204255655161]
  We study the physics of a magnetic molecule described by a "giant" spin with multiple $d > 2$ spin states. We derive an expression for the output modes in the dispersive regime of operation. We find that the measurement of the cavity transmission allows to uniquely determine the spin state of the qudits.
  arXiv  Detail & Related papers  (2021-09-29T18:00:09Z)
• Evolution of a Non-Hermitian Quantum Single-Molecule Junction at Constant Temperature [62.997667081978825]
  We present a theory for describing non-Hermitian quantum systems embedded in constant-temperature environments. We find that the combined action of probability losses and thermal fluctuations assists quantum transport through the molecular junction.
  arXiv  Detail & Related papers  (2021-01-21T14:33:34Z)

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.