Circuit‐QED: How strong can the coupling between a Josephson junction atom and a transmission line resonator be? *

By Michel H. Devoret, Steven M. Girvin, Robert J. Schoelkopf. Annals of Physics, 2007

243 citations recorded by the source corpus.

After reviewing the limitation by the fine structure constant α of the dimensionless coupling constant of an hydrogenic atom with a mode of the electromagnetic field in a cavity, we show that the situation presents itself differently for an artificial Josephson atom coupled to a transmission line resonator. Whereas the coupling constant for the case where such an atom is placed inside the dielectric of the resonator is proportional to α1/2, the coupling of the Josephson atom when it is placed in series with the conducting elements of the resonator is proportional to α‐1/2 and can reach values greater than 1.

Subfields: Artificial Intelligence, Atomic and Molecular Physics, and Optics

View Paper: https://www.semanticscholar.org/paper/43940299308526699468be6a5f684cb593be2b04

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Citations in the corpus

Hybrid quantum circuits: Superconducting circuits interacting with other quantum systems (2012, background): “Several experiments demonstrated the possibility to strongly, even ultrastrongly, couple SC qubits with resonators (Devoret et al., 2007; Hofheinz et al., 2009, 2008; Niemczyk et al., 2010; Sillanpää et al., 2007; Wallraff et al., 2004).”
Circuit quantum electrodynamics (2010, background): “This section presents a simple calculation [4, 6, 69] showing that the coupling strength of an atom and a photon in cavity QED has an upper limit that can be related to fundamental ∗ To avoid any confusion: this is the anharmonicity of the Jaynes–Cummings ladder, which should not be mistaken for the”
Strong Coupling Cavity QED with Gate-Defined Double Quantum Dots Enabled by a High Impedance Resonator (2017, background): “Zr p [25] by increasing the resonator impedance Zr beyond the typical 50 Ω of a standard coplanar waveguide.”
Circuit quantum electrodynamics (2020, background): “(31) as g = ωr Cg CΣ ( EJ 2EC )1/4√ Zr Zvac √ 2πα, (33) where α = Zvac/2RK is the fine-structure constant and Zvac = √ µ0/ 0 ∼ 377 Ω the impedance of vacuum with 0 the vacuum permittivity and µ0 the vacuum permeability (Devoret et al., 2007).”
Nonlinear response of the vacuum Rabi resonance (2008, background): “The drastic reduction in mode volume for such a quasi-one-dimensional syste”
Low-Disorder Microwave Cavity Lattices for Quantum Simulation with Photons (2012, background): “[23] provides a beautiful discussion for the physics”
Quantum information processing and quantum optics with circuit quantum electrodynamics (2020, background): “Because microwaves are the natu-ral frequency range for these circuits, the experiments discussed here are realized with microwave rather than optical photons.”
Ultrastrong coupling regimes of light-matter interaction (2018, background): “(9) The coupling strength g in the last expression can be re-written in a reduced form (Devoret et al., 2007) gtrC ωr = 1√ 2π3 ( EJ 8EC )1/4√ Z Zvac Cg Cg + Cq α1/2.”
Microwave photonics with superconducting quantum circuits (2017, background): “Superconducting artificial atoms can not only couple ultrastrongly to cavities [307, 404, 407, 409], as discussed in Sec.”
Circuit quantum electrodynamics in the ultrastrong-coupling regime (2010, background): “Here, we report on the first experimental realization of a circuit QED system operating in the ultrastrong-coupling limi”
Coherent Conversion Between Microwave and Optical Photons—An Overview of Physical Implementations (2019, unknown): “By tailoring the mode form, it can be chosen to be either high impedance, to maximize the coupling to electric dipole moments [39–42], or low impedance, maximizing coupling to magnetic dipole moments [43–45].”
Circuit QED: Superconducting Qubits Coupled to Microwave Photons (2015, methodology): “It is convenient to define a flux variable analogous to that used above but now dependent on position (Devoret, 1997)”