Stabilization of product states and excited-state quantum phase transitions in a coupled qubit-field system

• URL: http://arxiv.org/abs/2108.08210v2
• Date: Tue, 26 Oct 2021 12:12:29 GMT
• Title: Stabilization of product states and excited-state quantum phase transitions in a coupled qubit-field system
• Authors: Pavel Str\'ansk\'y, Pavel Cejnar, Radim Filip
• Abstract summary: We study a system of a single qubit interacting with a soft-mode bosonic field. An experimentally testable signature of some transitions is a dynamical stabilization of a fully factorized qubit-field state. We analyze semiclassical origins of these effects and show their connection to various forms of excited-state quantum phase transitions.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: We study a system of a single qubit (or a few qubits) interacting with a soft-mode bosonic field. Considering an extended version of the Rabi model with both parity-conserving and parity-violating interactions, we disclose a complex arrangement of quantum phase transitions in the ground- and excited-state domains. An experimentally testable signature of some of these transitions is a dynamical stabilization of a fully factorized qubit-field state involving the field vacuum. It happens in the ultrastrong coupling regime where the superradiant field equilibrium is far from the vacuum state. The degree of stabilization varies abruptly with interaction parameters and increases with the softness of the field mode. We analyze semiclassical origins of these effects and show their connection to various forms of excited-state quantum phase transitions.

Related papers

• Equivariant Variational Quantum Eigensolver to detect Phase Transitions through Energy Level Crossings [0.0]
  We introduce an equivariant quantum circuit that preserves the total spin and the translational symmetry to accurately describe singlet and triplet excited states. We also assess the impact of noise on the variational state, showing that conventional mitigation techniques like Zero Noise Extrapolation reliably restore its physical properties.
  arXiv  Detail & Related papers  (2024-03-11T18:51:57Z)
• Dynamics and Phases of Nonunitary Floquet Transverse-Field Ising Model [0.5141137421503899]
  We analyze the nonunitary Floquet- transverse-field I integrable model with complex nearest-neighbor couplings and complex transverse fields. The scaling of entanglement entropy in steady states and the evolution after a quench are compatible with the non-Hermitian generalization of the quasiparticle picture of Calabrese and Cardy.
  arXiv  Detail & Related papers  (2023-06-12T21:15:11Z)
• Dissipative preparation and stabilization of many-body quantum states in a superconducting qutrit array [55.41644538483948]
  We present and analyze a protocol for driven-dissipatively preparing and stabilizing a manifold of quantum manybody entangled states. We perform theoretical modeling of this platform via pulse-level simulations based on physical features of real devices. Our work shows the capacity of driven-dissipative superconducting cQED systems to host robust and self-corrected quantum manybody states.
  arXiv  Detail & Related papers  (2023-03-21T18:02:47Z)
• Dynamical quantum phase transitions in a spinor Bose-Einstein condensate and criticality enhanced quantum sensing [2.3046646540823916]
  Quantum phase transitions universally exist in the ground and excited states of quantum many-body systems. We unravel that both the ground and excited-state quantum phase transitions in spinor condensates can be diagnosed with dynamical phase transitions. This work advances the exploration of excited-state quantum phase transitions via a scheme that can immediately be applied to a broad class of few-mode quantum systems.
  arXiv  Detail & Related papers  (2022-09-23T05:27:17Z)
• 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)
• Tuning long-range fermion-mediated interactions in cold-atom quantum simulators [68.8204255655161]
  Engineering long-range interactions in cold-atom quantum simulators can lead to exotic quantum many-body behavior. Here, we propose several tuning knobs, accessible in current experimental platforms, that allow to further control the range and shape of the mediated interactions.
  arXiv  Detail & Related papers  (2022-03-31T13:32:12Z)
• 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)
• Excited-state quantum phase transitions in spin-orbit coupled Bose gases [0.0]
  We propose the Raman-dressed spin-orbit coupled gas as a novel platform to explore excited-state quantum phase transitions. The phase is characterize by the the behavior of the spatial density modulations, or stripes, induced by spin-orbit coupling. We show that the properties of the excited phase can be exploited to prepare stripe states with large and stable density modulations.
  arXiv  Detail & Related papers  (2021-09-03T13:08:47Z)
• Nonequilibrium phase transition in a driven-dissipative quantum antiferromagnet [0.0]
  This paper provides a numerical study of dynamical phases and the transitions between them in the nonequilibrium steady state of the prototypical two-dimensional Heisenberg antiferromagnet with drive and dissipation. A finite-size analysis reveals static and dynamical critical scaling at the transition, with a discontinuous slope of the magnon number versus driving field strength and critical slowing down at the transition point.
  arXiv  Detail & Related papers  (2021-07-08T13:35:00Z)
• Bloch-Landau-Zener dynamics induced by a synthetic field in a photonic quantum walk [52.77024349608834]
  We realize a photonic quantum walk in the presence of a synthetic gauge field. We investigate intriguing system dynamics characterized by the interplay between Bloch oscillations and Landau-Zener transitions.
  arXiv  Detail & Related papers  (2020-11-11T16:35:41Z)
• Universality of entanglement transitions from stroboscopic to continuous measurements [68.8204255655161]
  We show that the entanglement transition at finite coupling persists if the continuously measured system is randomly nonintegrable. This provides a bridge between a wide range of experimental settings and the wealth of knowledge accumulated for the latter systems.
  arXiv  Detail & Related papers  (2020-05-04T21:45:59Z)

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.