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Non-Perturbative Entangling Gates between Distant Qubits using Uniform Cold Atom Chains

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. Green open access

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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.

Type: Article
Title: Non-Perturbative Entangling Gates between Distant Qubits using Uniform Cold Atom Chains
Open access status: An open access version is available from UCL Discovery
DOI: 10.1103/PhysRevLett.106.140501
Publisher version: http://dx.doi.org/10.1103/PhysRevLett.106.140501
Language: English
Additional information: © 2011 American Physical Society 4 pages, 3 figures. Comments are welcome
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy
URI: https://discovery.ucl.ac.uk/id/eprint/1304206
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