title: Cavity-assisted quantum bath engineering.
abstract: We demonstrate quantum bath engineering for a superconducting artificial atom coupled to a microwave cavity. By tailoring the spectrum of microwave photon shot noise in the cavity, we create a dissipative environment that autonomously relaxes the atom to an arbitrarily specified coherent superposition of the ground and excited states. In the presence of background thermal excitations, this mechanism increases state purity and effectively cools the dressed atom state to a low temperature.
authors.affiliation: Quantum Nanoelectronics Laboratory, Department of Physics, University of California, Berkeley, California 94720, USA.
authors.forename: K W
authors.initials: KW
authors.lastname: Murch
authors.forename: U
authors.initials: U
authors.lastname: Vool
authors.forename: D
authors.initials: D
authors.lastname: Zhou
authors.forename: S J
authors.initials: SJ
authors.lastname: Weber
authors.forename: S M
authors.initials: SM
authors.lastname: Girvin
authors.forename: I
authors.initials: I
authors.lastname: Siddiqi