Critical fluorescence of a transmon at the Schmid transition

Abstract

We investigate inelastic microwave photon scattering by a transmon qubit embedded in a high-impedance circuit. The transmon undergoes a charge-localization (Schmid) transition upon the impedance reaching the critical value. Due to the unique transmon level structure, the fluorescence spectrum carries a signature of the transition point. At higher circuit impedance, quasielastic photon scattering may account for the main part of the inelastic scattering cross-section; we find its dependence on the qubit and circuit parameters.

6 pages, 3 figures

References in corpus (8)

• Charge insensitive qubit design derived from the Cooper pair box
• Suppressing Charge Noise Decoherence in Superconducting Charge Qubits
• Implementation of low-loss superinductances for quantum circuits
• Quantum Superinductor with Tunable Non-Linearity
• Inelastic Microwave Photon Scattering off a Quantum Impurity in a Josephson-Junction Array
• Quantum Effects in Small-Capacitance Single Josephson Junctions
• Microwave spectroscopy of a weakly-pinned charge density wave in a superinductor
• Superconductor-insulator transition in Josephson junction chains by quantum Monte-Carlo

Cited by in corpus (16)

• Absence versus Presence of Dissipative Quantum Phase Transition in Josephson Junctions
• Photon-instanton collider implemented by a superconducting circuit
• Inelastic decay from integrability
• Tuning the inductance of Josephson junction arrays without SQUIDs
• Observation of the Schmid-Bulgadaev dissipative quantum phase transition
• Direct detection of down-converted photons spontaneously produced at a single Josephson junction
• Functional Renormalization Group Approach to Circuit Quantum Electrodynamics
• Quantum and thermal fluctuations in the dynamics of a resistively and capacitively shunted Josephson junction
• Quantum Electronic Circuits for Multicritical Ising Models
• Simulation of Kitaev model using one-dimensional chain of superconducting qubits and environmental effect on topological states
• Bloch oscillations in a transmon embedded in a resonant electromagnetic environment
• Synchronization of Bloch oscillations by gate voltage modulation
• Resilience of the quantum critical line in the Schmid transition
• Quantum simulation of the microscopic to macroscopic crossover using superconducting quantum impurities
• Revisiting dissipation-driven phase transition in a Josephson junction
• Photon-instanton scattering in a superconducting circuit: Beyond the very high impedance regime