Superradiance with an ensemble of superconducting flux qubits

Understand

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.