Circuit quantum electrodynamics with a superconducting quantum point contact

Abstract

We consider a superconducting quantum point contact in a circuit quantum electrodynamics setup. We study three different configurations, attainable with current technology, where a quantum point contact is coupled galvanically to a coplanar waveguide resonator. Furthermore, we demonstrate that the strong and ultrastrong coupling regimes can be achieved with realistic parameters, allowing the coherent exchange between a superconducting quantum point contact and a quantized intracavity field. © 2012 American Physical Society. ; We acknowledge funding from Spanish MICINN Juan de la Cierva, FIS2009-12773-C02-01, and FIS2011-28851-C02-02; Basque Government IT472-10 and IT- 366-07; UPV/EHUUFI 11/55; SOLID, CCQED, and PROMISCE European projects. ; Peer Reviewed