Probing the symmetry breaking of a light--matter system by an ancillary qubit
arXiv:2209.05747 · doi:10.1038/s41467-023-40097-0
Abstract
Hybrid quantum systems in the ultrastrong, and even more in the deep-strong, coupling regimes can exhibit exotic physical phenomena and promise new applications in quantum technologies. In these nonperturbative regimes, a qubit--resonator system has an entangled quantum vacuum with a nonzero average photon number in the resonator, where the photons are virtual and cannot be directly detected. The vacuum field, however, is able to induce the symmetry breaking of a dispersively coupled probe qubit. We experimentally observe the parity symmetry breaking of an ancillary Xmon artificial atom induced by the field of a lumped-element superconducting resonator deep-strongly coupled with a flux qubit. This result opens a way to experimentally explore the novel quantum-vacuum effects emerging in the deep-strong coupling regime.
arXiv comment14 pages, 9 figures
References in corpus (41)
- Supplementary information for "Quantum supremacy using a programmable superconducting processor"
- Circuit Quantum Electrodynamics: Coherent Coupling of a Single Photon to a Cooper Pair Box
- Charge insensitive qubit design derived from the Cooper pair box
- Coherent control of macroscopic quantum states in a single-Cooper-pair box
- Superconducting Qubits: Current State of Play
- Ultrastrong coupling between light and matter
- Beyond the Jaynes-Cummings model: circuit QED in the ultrastrong coupling regime
- Atomic physics and quantum optics using superconducting circuits
- Microwave photonics with superconducting quantum circuits
- Strong quantum computational advantage using a superconducting quantum processor
- Ultrastrong coupling regimes of light-matter interaction
- Observation of the Dynamical Casimir Effect in a Superconducting Circuit
- Quantum information processing with superconducting circuits: a review
- Coherent Josephson qubit suitable for scalable quantum integrated circuits
- Coherent dynamics of a flux qubit coupled to a harmonic oscillator
- Observation of the Bloch-Siegert Shift in a Qubit-Oscillator System in the Ultrastrong Coupling Regime
- Superconducting qubit-oscillator circuit beyond the ultrastrong-coupling regime
- The Flux Qubit Revisited to Enhance Coherence and Reproducibility
- Deep Strong Coupling Regime of the Jaynes-Cummings model
- Ultrastrong coupling of a single artificial atom to an electromagnetic continuum in the nonperturbative regime
- Atom-Light Interactions in Photonic Crystals
- Quantum Phase Transition and Universal Dynamics in the Rabi model
- Qubit-oscillator systems in the ultrastrong-coupling regime and their potential for preparing nonclassical states
- Optical selection rules and phase-dependent adiabatic state control in a superconducting quantum circuit
- Photon Blockade in the Ultrastrong Coupling Regime
- The dynamical Casimir effect in a superconducting coplanar waveguide
- Low-decoherence flux qubit
- Qubit-oscillator dynamics in the dispersive regime: analytical theory beyond rotating-wave approximation
- Spontaneous Conversion from Virtual to Real Photons in the Ultrastrong Coupling Regime
- Universal scaling and critical exponents of the anisotropic quantum Rabi model
- Vacuum degeneracy of a circuit-QED system in the ultrastrong coupling regime
- Tutorial: Gate-based superconducting quantum computing
- Single-photon-driven high-order sideband transitions in an ultrastrongly coupled circuit quantum electrodynamics system
- Inversion of Qubit Energy Levels in Qubit-Oscillator Circuits in the Deep-Strong-Coupling Regime
- Spectral Classification of Coupling Regimes in the Quantum Rabi Model
- Amplified opto-mechanical transduction of virtual radiation pressure
- Resolution of superluminal signalling in non-perturbative cavity quantum electrodynamics
- Ancillary qubit spectroscopy of cavity (circuit) QED vacua
- Vacuum-Induced Symmetry Breaking in a Superconducting Quantum Circuit
- Photon production from the vacuum close to the super-radiant transition: When Casimir meets Kibble-Zurek
- Photon-Dressed Bloch-Siegert Shift in an Ultrastrongly Coupled Circuit Quantum Electrodynamical System
Cited by in corpus (11)
- Quantum Phase Transitions in Optomechanical Systems
- Relaxation breakdown and resonant tunneling in ultrastrong-coupling cavity QED
- Critical quantum metrology in a stabilized two-photon Rabi model
- Linear Ultrastrong Optomechanical Interaction
- Strong coupling between a single-photon and a two-photon Fock state
- One-step implementation of nonadiabatic geometric fSim gate in superconducting circuits
- Upgrading Quantum Metrology by Combined Sensitivity Resources in Mixed Linear-Nonlinear Light-Matter Interactions with Bias Field
- Globalized Nonlinear Critical Quantum Metrology by Two-photon Rabi-Stark model
- Negative Wigner function by decaying interaction from equilibrium
- Circuit QED Spectra in the Ultrastrong Coupling Regime: How They Differ from Cavity QED
- From Few to Many Emitters Cavity QED: Energy Levels and Emission Spectra From Weak to Deep-Strong Coupling