title: Photonic phase gate via an exchange of fermionic spin waves in a spin chain.
abstract: We propose a new protocol for implementing the two-qubit photonic phase gate. In our approach, the π phase is acquired by mapping two single photons into atomic excitations with fermionic character and exchanging their positions. The fermionic excitations are realized as spin waves in a spin chain, while photon storage techniques provide the interface between the photons and the spin waves. Possible imperfections and experimental systems suitable for implementing the gate are discussed.
authors.affiliation: Physics Department, Harvard University, Cambridge, Massachusetts 02138, USA.
authors.forename: Alexey V
authors.initials: AV
authors.lastname: Gorshkov
authors.forename: Johannes
authors.initials: J
authors.lastname: Otterbach
authors.forename: Eugene
authors.initials: E
authors.lastname: Demler
authors.forename: Michael
authors.initials: M
authors.lastname: Fleischhauer
authors.forename: Mikhail D
authors.initials: MD
authors.lastname: Lukin