title: Solid-state circuit for spin entanglement generation and purification.
abstract: We show how realistic charge manipulation and measurement techniques, combined with the exchange interaction, allow for the robust generation and purification of four-particle spin entangled states in electrically controlled semiconductor quantum dots. The generated states are immunized to the dominant sources of noise via a dynamical decoherence-free subspace; all additional errors are corrected by a purification protocol. This approach may find application in quantum computation, communication, and metrology.
authors.affiliation: Department of Physics, Harvard University, Cambridge, Massachusetts 02138, USA.
authors.forename: J M
authors.initials: JM
authors.lastname: Taylor
authors.forename: W
authors.initials: W
authors.lastname: Dür
authors.forename: P
authors.initials: P
authors.lastname: Zoller
authors.forename: A
authors.initials: A
authors.lastname: Yacoby
authors.forename: C M
authors.initials: CM
authors.lastname: Marcus
authors.forename: M D
authors.initials: MD
authors.lastname: Lukin