Radiative Properties of an Artificial Atom coupled to a Josephson Junction Array
arXiv:2205.14129 · doi:10.1103/PhysRevA.106.033714
Abstract
We study the radiative properties -- the Lamb shift, Purcell decay rate and the spontaneous emission dynamics -- of an artificial atom coupled to a long, multimode cavity formed by an array of Josephson junctions. Introducing a tunable coupling element between the atom and the array, we demonstrate that such a system can exhibit a crossover from a perturbative to non-perturbative regime of light-matter interaction as one strengthens the coupling between the atom and the Josephson junction array (JJA). As a consequence, the concept of spontaneous emission as the occupation of the local atomic site being governed by a single complex-valued exponent breaks down. This breakdown, we show, can be interpreted in terms of formation of hybrid atom-resonator modes with radiative losses that are non-trivially related to the effective coupling between individual modes. We develop a singular function expansion approach for the description of the open quantum system dynamics in such a multimode non-perturbative regime. This modal framework generalizes the normal mode description of quantum fields in a finite volume, incorporating exact radiative losses and incident quantum noise at the delimiting surface. Our results are pertinent to recent experiments with Josephson atoms coupled to high impedance Josephson junction arrays.
References in corpus (38)
- Circuit Quantum Electrodynamics
- Introduction to Quantum Noise, Measurement and Amplification
- Ultrastrong coupling between light and matter
- Non-Markovian dynamics in open quantum systems
- Ultrastrong coupling regimes of light-matter interaction
- Stimulating uncertainty: Amplifying the quantum vacuum with superconducting circuits
- Qubit-oscillator systems in the ultrastrong-coupling regime and their potential for preparing nonclassical states
- Black-box superconducting circuit quantization
- Implementation of low-loss superinductances for quantum circuits
- Light-matter decoupling in the deep strong coupling regime: The breakdown of the Purcell effect
- 3-Wave Mixing Josephson Dipole Element
- Josephson junction-embedded transmission-line resonators: from Kerr medium to in-line transmon
- Quantum metamaterials: Electromagnetic waves in a Josephson qubit line
- Ultrastrong coupling phenomena beyond the Dicke model
- Can ultrastrong coupling change ground state chemical reactions?
- Scattering in the ultrastrong regime: nonlinear optics with one photon
- Protected quantum computation with multiple resonators in ultrastrong coupling circuit QED
- Beyond Strong Coupling in a Massively Multimode Cavity
- The superconducting quasicharge qubit
- Large collective Lamb shift of two distant superconducting artificial atoms
- The Super-Strong Coupling Regime of Cavity Quantum Electrodynamics
- Scalable quantum memory in the ultrastrong coupling regime
- Quantum electrodynamics of a superconductor-insulator phase transition
- Observation of quantum many-body effects due to zero point fluctuations in superconducting circuits
- Dynamical polaron ansatz: a theoretical tool for the ultra-strong coupling regime of circuit QED
- Long-lasting Quantum Memories: Extending the Coherence Time of Superconducting Artificial Atoms in the Ultrastrong-Coupling Regime
- Josephson junction transmission lines as tunable artificial crystals
- Route from spontaneous decay to complex multimode dynamics in cavity QED
- Microwave photonics with Josephson junction arrays: negative refraction index and entanglement through disorder
- Origin and Implications of -like Contribution in the Quantization of Circuit-QED Systems
- Delocalizing effect of the Hubbard repulsion for electrons on a two-dimensional disordered lattice
- Inelastic scattering of a photon by a quantum phase-slip
- Frequency Combs in a Lumped-Element Josephson-Junction Circuit
- Resilience of the quantum Rabi model in circuit QED
- Non-Markovian dynamics of a superconducting qubit in an open multimode resonator
- An efficient Fredholm method for calculation of highly excited states of billiards
- Nearly quantum-limited Josephson-junction Frequency Comb synthesizer
- Ground State Excitation of an Atom Strongly Coupled to a Free Quantum Field