title: Transport Spectroscopy of a Spin-Coherent Dot-Cavity System.
abstract: Quantum engineering requires controllable artificial systems with quantum coherence exceeding the device size and operation time. This can be achieved with geometrically confined low-dimensional electronic structures embedded within ultraclean materials, with prominent examples being artificial atoms (quantum dots) and quantum corrals (electronic cavities). Combining the two structures, we implement a mesoscopic coupled dot-cavity system in a high-mobility two-dimensional electron gas, and obtain an extended spin-singlet state in the regime of strong dot-cavity coupling. Engineering such extended quantum states presents a viable route for nonlocal spin coupling that is applicable for quantum information processing.
authors.affiliation: Solid State Physics Laboratory, ETH Zurich, 8093 Zurich, Switzerland.
authors.forename: C
authors.initials: C
authors.lastname: Rössler
authors.affiliation: Solid State Physics Laboratory, ETH Zurich, 8093 Zurich, Switzerland.
authors.forename: D
authors.initials: D
authors.lastname: Oehri
authors.affiliation: Solid State Physics Laboratory, ETH Zurich, 8093 Zurich, Switzerland.
authors.forename: O
authors.initials: O
authors.lastname: Zilberberg
authors.affiliation: Solid State Physics Laboratory, ETH Zurich, 8093 Zurich, Switzerland.
authors.forename: G
authors.initials: G
authors.lastname: Blatter
authors.affiliation: Solid State Physics Laboratory, ETH Zurich, 8093 Zurich, Switzerland.
authors.forename: M
authors.initials: M
authors.lastname: Karalic
authors.affiliation: Solid State Physics Laboratory, ETH Zurich, 8093 Zurich, Switzerland.
authors.forename: J
authors.initials: J
authors.lastname: Pijnenburg
authors.affiliation: Solid State Physics Laboratory, ETH Zurich, 8093 Zurich, Switzerland.
authors.forename: A
authors.initials: A
authors.lastname: Hofmann
authors.affiliation: Solid State Physics Laboratory, ETH Zurich, 8093 Zurich, Switzerland.
authors.forename: T
authors.initials: T
authors.lastname: Ihn
authors.affiliation: Solid State Physics Laboratory, ETH Zurich, 8093 Zurich, Switzerland.
authors.forename: K
authors.initials: K
authors.lastname: Ensslin
authors.affiliation: Solid State Physics Laboratory, ETH Zurich, 8093 Zurich, Switzerland.
authors.forename: C
authors.initials: C
authors.lastname: Reichl
authors.affiliation: Solid State Physics Laboratory, ETH Zurich, 8093 Zurich, Switzerland.
authors.forename: W
authors.initials: W
authors.lastname: Wegscheider