Silicon based quantum computing

DIPC Seminars

María José Calderón, ICMM, CSIC, Madrid, Spain
Donostia International Physics Center
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Silicon based quantum computing 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). [3] J.C. Abadillo-Uriel et al, arXiv.1706.08858