Universidad Complutense de Madrid
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Quantum dot spin cellular automata for realizing a quantum processor

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Bayat, Abolfazl y Creffield, Charles E. y Jefferson, John H y Pepper, Michael y Bose, Sougato (2015) Quantum dot spin cellular automata for realizing a quantum processor. Semiconductor Science and Technology, 30 (10). ISSN 0268-1242

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URL Oficial: http://dx.doi.org/10.1088/0268-1242/30/10/105025




Resumen

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 (∼ 10 ns) deterministic coherent singlet- triplet filtering, as opposed to current incoherent tunneling/slow-adiabatic based quantum gates (operation time ∼ 300 ns), can be employed to produce a two-qubit gate through capacitive (electrostatic) couplings that can operate over significant distances. This is the coherent version of the widely discussed charge and nano-magnet cellular automata, and would increase speed, reduce dissipation, and 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. Significantly our system has zero electric dipole moment during the whole operation process, thereby increasing its charge dephasing time.


Tipo de documento:Artículo
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©IOP Publishing Ltd.
AB was supported by the EPSRC grant EP/K004077/1 (nano-electronic based quantum technologies). SB is supported by an ERC grant. CEC was supported by the MINECO (Spain) through grants FIS2010-21372 and FIS2013-41716-P. MP thanks the EPSRC, and JHJ and CEC acknowledge support from the EU NanoCTM network.

Palabras clave:Computation; Field
Materias:Ciencias > Física > Física-Modelos matemáticos
Ciencias > Física > Física matemática
Código ID:34988
Depositado:13 Ene 2016 19:56
Última Modificación:18 Ene 2016 09:10

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