Eur. Phys. J. B 30, 219-226 (2002)
https://doi.org/10.1140/epjb/e2002-00349-8

Quantum computational gates with radiation free couplings

¹ Department of Physics, Bilkent University, Ankara 06533, Turkey
² Department of Physical Sciences, University of Naples Federico II, P. Tecchio 80, Naples 80125, Italy

Corresponding author: ^a kulik@fen.bilkent.edu.tr

Received: 26 March 2002
Revised: 8 July 2002
Published online: 19 November 2002

Abstract

We examine a generic three level mechanism of quantum computation in which all fundamental single and double qubit quantum logic gates are operating under the effect of adiabatically controllable static (radiation free) bias couplings between the states. Under the time evolution imposed by these bias couplings the quantum state cycles between the two degenerate levels in the ground state and the quantum gates are realized by changing Hamiltonian at certain time intervals when the system collapses to a two state subspace. We propose a physical implementation of the mechanism using Aharonov-Bohm persistent-current loops in crossed electric and magnetic fields, with the output of the loop read out by using a quantum Hall effect aided mechanism.