Theory of spin qubits in nanostructures

Abstract

We review recent advances on the theory of spin qubits in nanostructures. We focus on four selected topics. First, we show how to form spin qubits in the new and promising material graphene. Afterwards, we discuss spin relaxation and decoherence in quantum dots. In particular, we demonstrate how charge fluctations in the surrounding environment cause spin decay via spin--orbit coupling. We then turn to a brief overview of how one can use electron-dipole spin resonance (EDSR) to perform single spin rotations in quantum dots using an oscillating electric field. The final topic we cover is the spin-spin coupling via spin-orbit interaction which is an alternative to the usual spin-spin coupling via the Heisenberg exchange interaction.

18 pages, 8 figures, submitted to JPSJ Special Topics: Advances in Spintronics

References in corpus (9)

• Single-shot read-out of an individual electron spin in a quantum dot
• Coherent control of a single electron spin with electric fields
• Hyperfine interaction in a quantum dot: Non-Markovian electron spin dynamics
• Spin qubits with electrically gated polyoxometalate molecules
• Zeeman energy and spin relaxation in a one-electron quantum dot
• Single-shot readout of electron spin states in a quantum dot using spin-dependent tunnel rates
• Aharonov-Bohm effect and broken valley-degeneracy in graphene rings
• Measurement of Rashba and Dresselhaus spin-orbit magnetic fields
• Recipes for spin-based quantum computing