Nonperturbative entangling gates between distant qubits using uniform cold atom chains

Phys Rev Lett. 2011 Apr 8;106(14):140501. doi: 10.1103/PhysRevLett.106.140501. Epub 2011 Apr 4.

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.