Banchi, L; Bayat, A; Verrucchi, P; Bose, S; (2011) Non-Perturbative Entangling Gates between Distant Qubits using Uniform Cold Atom Chains. Physical Review Letters , 106 (14) , Article 140501. 10.1103/PhysRevLett.106.140501.

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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 non-engineered chain of interacting qubits. The quality of the gate scales very efficiently with qubit separations. Surprisingly, a sudden switching of the coupling is not necessary and our gate mechanism is not altered by a possibly gradual switching. The bus is also naturally reset to its initial state making the complex resetting procedure unnecessary after each application of the gate. Moreover, we propose a possible experimental realization in cold atoms trapped in optical lattices and near field Fresnel trapping potentials, which are both accessible to current technology.

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