Semiconductor quantum ring as a solid-state spin qubit

Details Semiconductor quantum ring as a solid-state spin qubit Semiconductor quantum ring as a solid-state spin qubit

2010-11-11

arxiv.org/abs/1011.2540v1

Journal of Physics: Condensed Matter 23, 115302 (2011)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

16 pages, 3 figure 3 tables

Scientific paper

10.1088/0953-8984/23/11/115302

The implementation of a spin qubit in a quantum ring occupied by one or a few electrons is proposed. Quantum bit involves the Zeeman sublevels of the highest occupied orbital. Such a qubit can be initialized, addressed, manipulated, read out and coherently coupled to other quantum rings. An extensive discussion of relaxation and decoherence is presented. By analogy with quantum dots, the spin relaxation times due to spin-orbit interaction for experimentally accessible quantum ring architectures are calculated. The conditions are formulated under which qubits build on quantum rings can have long relaxation times of the order of seconds. Rapidly improving nanofabrication technology have made such ring devices experimentally feasible and thus promising for quantum state engineering.

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