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Silicon based quantum computing

Friday, January 12, 2018 - 12:00
Donostia International Physics Center
María José Calderón, ICMM, CSIC, Madrid, Spain
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As silicon transistors get to the few nanometer characteristic size,
novel platforms for electronics are being proposed. In parallel, the advent of
quantum technologies is giving life to new research in Si nanoelectronics and
quantum computation. With the promise of long coherence times, atomic scale
miniaturization, scalability and straightforward integration with existing
technologies, dopant based spin qubits were proposed twenty years ago [1],
almost simultaneously with quantum dot qubits [2]. For many years after the
first proposals, Si based quantum computing research was always behind other
semiconductor platforms but continuous research, and investment, started to pay
off a few years ago. I will review some of the landmarks of recent Silicon
quantum electronics research and then focus on the most recent proposal of
using acceptors in Silicon as qubits. Acceptors would allow full electrical
control of spin qubits while keeping long coherence and relaxation times [3]. I
will show that the fact that holes have an effective spin 3/2, unlike the
electron spin ½, plays a very important role on this proposal.

[1] B.
Kane, Nature 393, 133 (1998).

[2] D.
Loss and D. DiVincenzo, Physical Review A 57, 120 (1998).

J.C. Abadillo-Uriel et al, arXiv.1706.08858

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