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oai:docta.ucm.es:20.500.14352/242842024-09-03T15:39:04Zcom_20.500.14352_14col_20.500.14352_15

00925njm 22002777a 4500 dc Bayat, Abolfazl author Creffield, Charles author Jefferson, John H author Pepper, Michael author Bose, Sougato author 2015-10 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. 0268-1242 10.1088/0268-1242/30/10/105025 https://hdl.handle.net/20.500.14352/24284 http://dx.doi.org/10.1088/0268-1242/30/10/105025 http://iopscience.iop.org http://arxiv.org/abs/1310.4376 Quantum dot spin cellular automata for realizing a quantum processor