Colloquium: Dr. C. Henry Yang, University of New South Wales

Quantum computing with Silicon MOS spin qubits

ABSTRACT: 

Spin qubits in silicon are excellent candidates for scalable quantum computers [1] due to their long coherence times and the enormous investment in silicon CMOS technology. In this talk, I will walk through the architecture of our Si-MOS quantum dots. With combination of isotopically enriched Si‑28 substrate and an on-chip electron spin resonance (ESR) microwave line, these quantum dots can be operated as spin qubits [2,3] with high fidelity [4,5]. In addition, I will present our recent experiments on the demonstrating the scalability strengths of Si-MOS qubits, including spin qubits with multi-electrons [6], and operation of qubits above one kelvin [7].

[1]  D. D. Awschalom et al. Science 339, 1174 (2013).

[2]  M. Veldhorst et al. Nature Nanotechnology 9, 981 (2014).

[3]  M. Veldhorst et al. Nature 526, 410 (2015).

[4]  C. H. Yang et al. Nature Electronics 2, 151 (2019)

[5]  W. Huang et al. Nature 569, 532 (2019).

[6]  R. C. C. Leon et al. Nature Communications 11, 797 (2020).

[7]  C. H. Yang et al. Nature 580, 350 (2020).