Dephasing and hyperfine interaction in carbon nanotubes double quantum dots: Disordered case

Dephasing and hyperfine interaction in carbon nanotubes double quantum dots: Disordered case

Andres A. Reynoso1,2,3 and Karsten Flensberg3 1Centre for Engineered Quantum Systems, School of Physics, The University of Sydney, NSW 2006, Australia 2Niels Bohr International Academy, Niels Bohr Institute, Blegdamsvej 17, 2100 Copenhagen Ø, Denmark 3Niels Bohr Institute & Nano-Science Center, University of Copenhagen, Universitetsparken 5, 2100 Copenhagen, Denmark (Received 14 February 2012; ...

Dephasing and hyperfine interaction in carbon nanotube double quantum dots: The clean limit

We consider theoretically 13C-hyperfine interaction-induced dephasing in carbon nanotubes double quantum dots with curvature-induced spin-orbit coupling. For two electrons initially occupying a single dot, we calculate the average return probability after separation into the two dots, which have random nuclear spin configurations. We focus on the long-time saturation value of the return probabi...

Orbital hyperfine interaction and qubit dephasing in carbon nanotube quantum dots

Hyperfine interaction (HF) is of key importance for the functionality of solid-state quantum information processing, as it affects qubit coherence and enables nuclear-spin quantum memories. In this work, we complete the theory of the basic HF mechanisms (Fermi contact, dipolar, orbital) in carbon nanotube quantum dots by providing a theoretical description of the orbital HF. We find that orbita...

Double Quantum Dots in Carbon Nanotubes

Quantum dots in carbon nanotubes

In this overview paper, we present low-temperature electronic transport measurements of carbon nanotube quantum dots with a back gate. In a semiconducting tube, charge carriers could be completely depleted. The addition energy and the excitation spectrum have been studied as a function of the number of charges (electrons or holes), one by one. We observe electron–hole symmetry, which is a direc...