A solid-state implementation of a universal set of gates for quantum computation is proposed and analysed using a time-dependent 2D Schrodinger solver. The qubit is defined as the state of an electron propagating along a couple of quantum wires. The wires are suitably coupled through a potential barrier with variable height and/or width. It is shown how a proper design of the system allows the implementation of any one-qubit transformation. The two-qubit gate is realized through a Coulomb coupler able to entangle the quantum states of two electrons running in two wires of two different qubits. The simulated devices are GaAs-AlGaAs heterostructures that should be on the borderline of present semiconductor technology. An estimate of decoherence effects due to phonon scattering is also presented.

Numerical simulation of coherent transport in quantum wires for quantum computing / A., Bertoni; Bordone, Paolo; Brunetti, Rossella; Jacoboni, Carlo; S., Reggiani. - In: JOURNAL OF MODERN OPTICS. - ISSN 0950-0340. - STAMPA. - 49:(2002), pp. 1219-1234.

Numerical simulation of coherent transport in quantum wires for quantum computing

BORDONE, Paolo;BRUNETTI, Rossella;JACOBONI, Carlo;
2002

Abstract

A solid-state implementation of a universal set of gates for quantum computation is proposed and analysed using a time-dependent 2D Schrodinger solver. The qubit is defined as the state of an electron propagating along a couple of quantum wires. The wires are suitably coupled through a potential barrier with variable height and/or width. It is shown how a proper design of the system allows the implementation of any one-qubit transformation. The two-qubit gate is realized through a Coulomb coupler able to entangle the quantum states of two electrons running in two wires of two different qubits. The simulated devices are GaAs-AlGaAs heterostructures that should be on the borderline of present semiconductor technology. An estimate of decoherence effects due to phonon scattering is also presented.
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Numerical simulation of coherent transport in quantum wires for quantum computing / A., Bertoni; Bordone, Paolo; Brunetti, Rossella; Jacoboni, Carlo; S., Reggiani. - In: JOURNAL OF MODERN OPTICS. - ISSN 0950-0340. - STAMPA. - 49:(2002), pp. 1219-1234.
A., Bertoni; Bordone, Paolo; Brunetti, Rossella; Jacoboni, Carlo; S., Reggiani
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11380/304553
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