%0 Journal Article
%T Quantum Dot Spin Cellular Automata for Realizing a Quantum Processor
%A Abolfazl Bayat
%A Charles E. Creffield
%A John H. Jefferson
%A Michael Pepper
%A Sougato Bose
%J Physics
%D 2013
%I arXiv
%R 10.1088/0268-1242/30/10/105025
%X We show how "single" quantum dots, each hosting a singlet-triplet qubit, can be placed in arrays to build a spin quantum cellular automaton. A fast ($\sim 10$ ns) deterministic coherent singlet-triplet filtering, as opposed to current incoherent tunneling/slow-adiabatic based quantum gates (operation time $\sim 300$ ns), can be employed to produce a two-qubit gate through capacitive (electrostatic) coupling that can operate over significant distances. This is the coherent version of the widely discussed charge and nano-magnet cellular automata and would offer speed, reduce dissipation, perform quantum computation, while interfacing smoothly with its classical counterpart. This combines the best of two worlds -- the coherence of spin pairs known from quantum technologies, and the strength and range of electrostatic couplings from the charge based classical cellular automata.
%U http://arxiv.org/abs/1310.4376v2