Spin-Boson Quantum Phase Transition in Multilevel Superconducting Qubits - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Physical Review Letters Année : 2021

Spin-Boson Quantum Phase Transition in Multilevel Superconducting Qubits

Résumé

Superconducting circuits are currently developed as a versatile platform for the exploration of many-body physics, by building on nonlinear elements that are often idealized as two-level qubits. A classic example is given by a charge qubit that is capacitively coupled to a transmission line, which leads to the celebrated spin-boson description of quantum dissipation. We show that the intrinsic multilevel structure of superconducting qubits drastically restricts the validity of the spin-boson paradigm due to phase localization, which spreads the wave function over many charge states. Numerical renormalization group simulations also show that the quantum critical point moves out of the physically accessible range in the multilevel regime. Imposing charge discreteness in a simple variational state accounts for these multilevel effects, which are relevant for a large class of devices.
Fichier principal
Vignette du fichier
PhysRevLett.127.237702.pdf (346.54 Ko) Télécharger le fichier
Origine : Fichiers éditeurs autorisés sur une archive ouverte

Dates et versions

hal-03441872 , version 1 (11-08-2023)

Identifiants

Citer

Kuljeet Kaur, Théo Sépulcre, Nicolas Roch, Izak Snyman, Serge Florens, et al.. Spin-Boson Quantum Phase Transition in Multilevel Superconducting Qubits. Physical Review Letters, 2021, 127 (23), pp.237702. ⟨10.1103/PhysRevLett.127.237702⟩. ⟨hal-03441872⟩

Collections

UGA CNRS NEEL
122 Consultations
14 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More