Quantum-to-Classical Transition in Cavity Quantum Electrodynamics

Abstract

The quantum properties of electromagnetic, mechanical or other harmonic oscillators can be revealed by investigating their strong coherent coupling to a single quantum two level system in an approach known as cavity quantum electrodynamics (QED). At temperatures much lower than the characteristic energy level spacing the observation of vacuum Rabi oscillations or mode splittings with one or a few quanta asserts the quantum nature of the oscillator. Here, we study how the classical response of a cavity QED system emerges from the quantum one when its thermal occupation -- or effective temperature -- is raised gradually over 5 orders of magnitude. In this way we explore in detail the continuous quantum-to-classical crossover and demonstrate how to extract effective cavity field temperatures from both spectroscopic and time-resolved vacuum Rabi measurements.

revised version: improved analysis, 4 pages, 4 figures, hi-res version available at http://qudev.ethz.ch/content/science/PubsPapers.html

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• Nonlinear Quantum Optomechanics via Individual Intrinsic Two-Level Defects
• Observation of the photon-blockade breakdown phase transition
• Observation of a Dissipation-Induced Classical to Quantum Transition
• Characterizing Quantum Microwave Radiation and its Entanglement with Superconducting Qubits using Linear Detectors
• Studying Light-Harvesting Models with Superconducting Circuits
• Multi-mode ultra-strong coupling in circuit quantum electrodynamics
• Regimes of strong light-matter coupling under incoherent excitation
• Rabi model as a quantum coherent heat engine: From quantum biology to superconducting circuits
• Cavity quantum electro-optics: Microwave-telecom conversion in the quantum ground state
• Quantum Electromechanics on Silicon Nitride Nanomembranes
• Tunable and Switchable Coupling Between Two Superconducting Resonators
• A quantum heat engine with coupled superconducting resonators
• Role of quantum correlations in light-matter quantum heat engines
• Broken selection rule in the quantum Rabi model
• Observation of the Bloch-Siegert shift in a driven quantum-to-classical transition
• On-chip cavity quantum phonodynamics with an acceptor qubit in silicon
• Simulating nonlinear dynamics of collective spins via quantum measurement and feedback
• Quantum-classical transition of correlations of two coupled cavities
• Photon Statistics of Propagating Thermal Microwaves
• Generating nonclassical photon-states via longitudinal couplings between superconducting qubits and microwave fields
• The role of environmental correlations in the non-Markovian dynamics of a spin system
• Quantum and Classical Chirps in an Anharmonic Oscillator
• Spectral signatures of non-thermal baths in quantum thermalization
• Quantum interferometry with a g-factor-tunable spin qubit
• Primary thermometry of propagating microwaves in the quantum regime
• Quantum behavior of a many photons cavity field revealed by quantum discord
• Simulation of complex dynamics of mean-field $p$-spin models using measurement-based quantum feedback control
• Applications of the Fokker-Planck equation in circuit quantum electrodynamics
• Coupling between Rydberg states and Landau levels of electrons trapped on liquid helium
• Quantum heat engine with a quadratically coupled optomechanical system
• Cavity quantum electrodynamics using a near-resonance two-level system: emergence of the Glauber state
• Multilevel effects in a driven generalized Rabi model
• Photonic heat transport across a Josephson junction
• Two-Frequency Jahn-Teller Systems in Circuit QED
• Thermometry and memcapacitance with qubit-resonator system
• A Review of Design Concerns in Superconducting Quantum Circuits
• Probing the Jaynes-Cummings Ladder with Spin Circuit Quantum Electrodynamics
• The scattering coefficients of superconducting microwave resonators: II. System-bath approach
• Synchronization of Networked Jahn-Teller Systems in Circuit QED
• Quantum versus Classical Regime in Circuit Quantum Acoustodynamics
• Enantiomer detection via Quantum Otto cycle
• Optical and atomic stochastic resonances in the driven dissipative Jaynes-Cummings model
• Probabilistic motional averaging
• Quantum signatures in quadratic optomechanical heat engine with an atom in a tapered trap
• Temperature Damping of Magneto-Intersubband Resistance Oscillations in Magnetically Entangled Subbands
• Relaxation time for monitoring the quantumness of an intense cavity field
• Correlations of cascaded photons: An analytical study in the two-photon Mollow regime
• Strong coupling and active cooling in a finite temperature hybrid atom-cavity system
• Spectrum of Single-Photon Scattering in a Strong-Coupling Hybrid Optomechanical System
• Quantum circuit refrigerator based on quantum dots coupled to normal-metal and superconducting electrodes
• Emergence of Classical Dynamics from a Random Matrix Schrödinger Model