Semiconductor quantum ring as a solid-state spin qubit

Abstract

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.

16 pages, 3 figure 3 tables

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Cited by in corpus (13)

• Wave function engineering in quantum dot-ring nanostructures
• Dominant role of the shear strain induced admixture in spin-flip processes in self-assembled quantum dots
• Tuning of Exciton States in a Magnetic Quantum Ring
• Electrical control of spin relaxation time in complex quantum nanostructures
• All-Optical Generation and Tuning of Ultrafast Spin-Hall Current via Optical Vortices
• Tunneling-related electron spin relaxation in self-assembled quantum-dot molecules
• Rotating effects on the photoionization cross-section of a 2D quantum ring
• Charge transport through a semiconductor quantum dot-ring nanostructure
• Quantum Dot-Ring Nanostructure - a Comparison of Different Approaches
• Bound state and persistent currents in the presence of torsion and Rashba spin-orbit coupling
• Nonequilibrium Kondo-vs-RKKY Scenarios in Nanoclusters
• Tuning of few-electron states and optical absorption anisotropy in GaAs quantum rings
• Peculiarity of Symmetric Ring Systems with Double Y-Junctions and the magnetic effects