title: Nonperturbative entangling gates between distant qubits using uniform cold atom chains.
abstract: We propose a new fast scalable method for achieving a two-qubit entangling gate between arbitrary distant qubits in a network by exploiting dispersionless propagation in uniform chains. This is achieved dynamically by switching on a strong interaction between the qubits and a bus formed by a nonengineered chain of interacting qubits. The quality of the gate scales very efficiently with qubit separations. Surprisingly, a sudden switching of the couplings is not necessary. Moreover, our gate mechanism works for multiple gate operations without resetting the bus. We propose a possible experimental realization in cold atoms trapped in optical lattices and near field Fresnel trapping potentials.
authors.affiliation: Dipartimento di Fisica, Università di Firenze, Via G. Sansone 1, I-50019 Sesto Fiorentino (FI), Italy.
authors.forename: Leonardo
authors.initials: L
authors.lastname: Banchi
authors.forename: Abolfazl
authors.initials: A
authors.lastname: Bayat
authors.forename: Paola
authors.initials: P
authors.lastname: Verrucchi
authors.forename: Sougato
authors.initials: S
authors.lastname: Bose