Quantum bits

Quantum rings are very attractive systems in context of quantum computing. Two characteristic properties: ground state persistent current and orbital magnetic moment allows defining a quantum bits on theese degrees of freedom. The potential application of quantum rings in developing quantum computers depends on its resistance to decoherence and relaxation. We address this problem and compare relaxation in quatum dots and quantum rings.

Related papers:

1. E. Zipper, M. Kurpas, M. M. Maska Wave function engineering in quantum dot-ring nanostructures, New J. Phys. 14, 093029 (2012)  arXiv:1203.1025v1

2. E. Zipper, M. Kurpas, J. Sadowski and M.M. Maśka, Spin relaxation in semiconductor quantum rings and dots - a comparative study, J. Phys.: Condens. Matter 23 115302 (2011)

 3.  E. Zipper, M. Kurpas, M. Szelag, J. Dajka, M. Szopa , Flux qubit on a mesoscopic non-superconduting ring, Phys. Rev. B 74, 125426 (2006)