Strongly interacting fermions are non-trivial yet non-glassy

• URL: http://arxiv.org/abs/2408.15699v4
• Date: Tue, 5 Nov 2024 04:09:15 GMT
• Title: Strongly interacting fermions are non-trivial yet non-glassy
• Authors: Eric R. Anschuetz, Chi-Fang Chen, Bobak T. Kiani, Robbie King,
• Abstract summary: We show that low-temperature strongly interacting fermions, unlike spins, belong in a classically nontrivial yet quantumly easy phase. Our results suggest that low-temperature strongly interacting fermions, unlike spins, belong in a classically nontrivial yet quantumly easy phase.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Random spin systems at low temperatures are glassy and feature computational hardness in finding low-energy states. We study the random all-to-all interacting fermionic Sachdev--Ye--Kitaev (SYK) model and prove that, in contrast, (I) the low-energy states have polynomial circuit depth, yet (II) the annealed and quenched free energies agree to inverse-polynomially low temperatures, ruling out a glassy phase transition in this sense. These results are derived by showing that fermionic and spin systems significantly differ in their commutation index, which quantifies the non-commutativity of Hamiltonian terms. Our results suggest that low-temperature strongly interacting fermions, unlike spins, belong in a classically nontrivial yet quantumly easy phase.

Related papers

• Estimating entanglement monotones of non-pure spin-squeezed states [0.0]
  We estimate entanglements of general mixed many-body quantum states via lower and upper bounds from entanglement witnesses and separable ansatz states respectively. We derive lower bounds to distance-like measure from the set of fully separable states based on spin-squeezing inequalities.
  arXiv  Detail & Related papers  (2025-04-10T14:51:18Z)
• Harnessing Chiral Spin States in Molecular Nanomagnets for Quantum Technologies [44.1973928137492]
  We show that chiral qubits naturally suppress always-on interactions that can not be switched off in weakly coupled qubits. Our findings establish spin chirality engineering as a promising strategy for mitigating always-on interaction in entangling two chiral qubits in molecular quantum technologies.
  arXiv  Detail & Related papers  (2025-01-21T08:23:12Z)
• Probing the magnetic origin of the pseudogap using a Fermi-Hubbard quantum simulator [30.29758729899544]
  In strongly correlated materials, interacting electrons are entangled and form collective quantum states. Superconductivity emerges at low doping out of an unusual pseudogap'' metallic state above the critical temperature. We use a quantum gas microscope Fermi-Hubbard simulator to explore a wide range of doping levels and temperatures.
  arXiv  Detail & Related papers  (2024-12-23T18:58:01Z)
• The strongly driven Fermi polaron [49.81410781350196]
  Quasiparticles are emergent excitations of matter that underlie much of our understanding of quantum many-body systems. We take advantage of the clean setting of homogeneous quantum gases and fast radio-frequency control to manipulate Fermi polarons. We measure the decay rate and the quasiparticle residue of the driven polaron from the Rabi oscillations between the two internal states.
  arXiv  Detail & Related papers  (2023-08-10T17:59:51Z)
• Quantum Effects on the Synchronization Dynamics of the Kuramoto Model [62.997667081978825]
  We show that quantum fluctuations hinder the emergence of synchronization, albeit not entirely suppressing it. We derive an analytical expression for the critical coupling, highlighting its dependence on the model parameters.
  arXiv  Detail & Related papers  (2023-06-16T16:41:16Z)
• Non-Fermi liquids from kinetic constraints in tilted optical lattices [0.0]
  We show how the kinetic constraints stabilize an exotic non-Fermi liquid phase described by fermions coupled to a gapless bosonic field. This offers a novel route towards the study of non-Fermi liquid phases in the precision environments afforded by ultracold atom platforms.
  arXiv  Detail & Related papers  (2023-02-16T18:54:43Z)
• Kagome qubit ice [55.73970798291771]
  Topological phases of spin liquids with constrained disorder can host a kinetics of fractionalized excitations. We present a realization of kagome spin ice in the superconducting qubits of a quantum annealer. We show evidence of both the Ice-I phase and an unconventional field-induced Ice-II phase.
  arXiv  Detail & Related papers  (2023-01-04T23:46:48Z)
• Thermal self-oscillations in monolayer graphene coupled to a superconducting microwave cavity [58.720142291102135]
  We observe thermal self-oscillations in a monolayer graphene flake coupled to superconducting resonator. The experimental observations fit well with theoretical model based on thermal instability. The modelling of the oscillation sidebands provides a method to evaluate electron phonon coupling in disordered graphene sample at low energies.
  arXiv  Detail & Related papers  (2022-05-27T15:38:41Z)
• Accessing the topological Mott insulator in cold atom quantum simulators with realistic Rydberg dressing [58.720142291102135]
  We investigate a realistic scenario for the quantum simulation of such systems using cold Rydberg-dressed atoms in optical lattices. We perform a detailed analysis of the phase diagram at half- and incommensurate fillings, in the mean-field approximation. We furthermore study the stability of the phases with respect to temperature within the mean-field approximation.
  arXiv  Detail & Related papers  (2022-03-28T14:55:28Z)
• Heat transport and cooling performance in a nanomechanical system with local and non local interactions [68.8204255655161]
  We study heat transport through a one dimensional time-dependent nanomechanical system. The system presents different stationary transport regimes depending on the driving frequency, temperature gradients and the degree of locality of the interactions.
  arXiv  Detail & Related papers  (2022-02-21T12:03:54Z)
• Thermoelectric properties of topological chains coupled to a quantum dot [40.19796930944118]
  Topological one-dimensional superconductors can sustain in their extremities zero energy modes that are protected by different kinds of symmetries. We consider the simplest kind of topological insulators, namely chains of atoms with hybridized $sp$ orbitals. We show that the electrical conductance and the Wiedemann-Franz ratio of the device at the topological transition have universal values at very low temperatures.
  arXiv  Detail & Related papers  (2021-12-20T22:52:00Z)
• Metastable spin-phase diagrams in antiferromagnetic Bose-Einstein condensates [0.0]
  We study theoretically the metastable spin-phase diagram of a spin-1 antiferromagnetic Bose-Einstein condensate at zero and finite temperatures. Results are consistent with recent experiments and allow us to explain qualitatively the different types of observed quench dynamics.
  arXiv  Detail & Related papers  (2021-09-05T03:47:59Z)
• Self-induced glassy phase in multimodal cavity quantum electrodynamics [0.0]
  We present results showing that the system has a low-temperature glassy phase. For rational values of the only free adimensional parameter $alpha=p/q$ of the interaction, the number of metastable states at low temperature grows exponentially.
  arXiv  Detail & Related papers  (2021-01-11T08:23:20Z)
• Quantum Phase Transition in a Quantum Ising Chain at Nonzero Temperatures [0.0]
  We study the response of a thermal state of an Ising chain to a nonlocal non-Hermitian perturbation. The dynamic responses for initial thermal states in different quantum phases are distinct.
  arXiv  Detail & Related papers  (2020-09-24T07:41:32Z)
• Low-energy physics of isotropic spin-1 chains in the critical and Haldane phases [0.0]
  We explore the low-energy excitations of isotropic bilinear-biquadratic spin-1 chains. Haldane mapped the spin-1 Heisenberg antiferromagnet to a continuum field theory. New excitations emerge at higher energies and, in the vicinity of the purely biquadratic point, they show simple cosine dispersions.
  arXiv  Detail & Related papers  (2020-05-07T17:48:19Z)

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.