Superradiance with an ensemble of superconducting flux qubits

Abstract

Superconducting flux qubits are a promising candidate for realizing quantum information processing and quantum simulations. Such devices behave like artificial atoms, with the advantage that one can easily tune the "atoms" internal properties. Here, by harnessing this flexibility, we propose a technique to minimize the inhomogeneous broadening of a large ensemble of flux qubits by tuning only the external flux. In addition, as an example of many-body physics in such an ensemble, we show how to observe superradiance, and its quadratic scaling with ensemble size, using a tailored microwave control pulse that takes advantage of the inhomogeneous broadening itself to excite only a sub-ensemble of the qubits. Our scheme opens up an approach to using superconducting circuits to explore the properties of quantum many-body systems.

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• Two-photon resonance fluorescence of two interacting non-identical quantum emitters
• Generalized Dicke model and gauge-invariant master equations for two atoms in ultrastrongly-coupled cavity quantum electrodynamics
• Spectrum of the Dicke model in a superconducting qubit-oscillator system
• Lee-Yang theory of the superradiant phase transition in the open Dicke model
• Observation of collapse and revival in a superconducting atomic frequency comb
• Superradiant emission spectra of a two-qubit system in circuit quantum electrodynamics
• Controlling periodic Fano resonances of quantum acoustic waves with a giant atom coupled to microwave waveguide
• Attaining near-ideal Dicke superradiance in expanded spatial domains
• Solving Dicke superradiance analytically: A compendium of methods
• An exact analytical solution for Dicke superradiance
• Benchmarking Digital-Analog Quantum Computation
• Characterization and generation of a SQL-beating catlike state through repetitive measurements
• Spin amplification in realistic systems
• Superradiant Quantum Phase Transition in Open Systems: System-Bath Interaction at the Critical Point