Theory of coherent control of spin-valley qubits

ORAL · Invited

Abstract

Certain semiconductors have an electronic conduction or valence band with a multi-valley structure. This feature opens up the possibility of leveraging the combination of the electronic spin and valley degrees of freedom for coherent quantum dynamics, including opportunities for quantum information processing. In this theory talk, I will introduce the concept of a spin-valley qubit via specific example materials, and review recent progress and open challenges toward exploiting these qubits for quantum information.

* This research was supported by the Ministry of Culture and Innovation and the National Research, Development and Innovation Office (NKFIH) within the Quantum Information National Laboratory of Hungary (Grant No. 2022-2.1.1-NL-2022-00004), by the European Union within the Horizon Europe research and innovation programme via the IGNITE project and via ONCHIPS project (under grant agreement No 101080022), by NKFIH via the OTKA Grant No. 132146, and by the HUN-REN Hungarian Research Network.

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Publication: 1. A. Palyi, G. Burkard, Hyperfine-induced valley mixing and the spin-valley blockade in carbon-based quantum dots, Phys. Rev. B 80, 201404(R) (2009)
2. A. Palyi, G. Burkard, Spin-valley blockade in carbon nanotube double quantum dots, Phys. Rev. B 82, 155424 (2010)
3. A. Palyi, G. Burkard, Disorder-mediated electron valley resonance in carbon nanotube quantum dots, Phys. Rev. Lett. 106, 086801 (2011)
4. A. Palyi, P. R. Struck, M. Rudner, K. Flensberg, G. Burkard, Spin-orbit induced strong coupling of a single spin to a nanomechanical resonator, Phys. Rev. Lett. 108, 206811 (2012)
5. G. Szechenyi, A. Palyi, Current hot spot in the spin-valley blockade in carbon nanotubes, Phys. Rev. B 88, 235414 (2013)
6. P. Boross, G. Szechenyi, D. Culcer, A. Palyi, Control of valley dynamics in silicon quantum dots in the presence of an interface step, Phys. Rev. B 94, 035438 (2016)
7. T. Pei, A. Palyi, M. Mergenthaler, N. Ares, A. Mavalankar, J. H. Warner, G. A. D. Briggs, E. A. Laird, Hyperfine and spin-orbit coupling effects on decay of spin-valley states in a carbon nanotube, Phys. Rev. Lett. 118, 177701 (2017)
8. G. Szechenyi, L. Chirolli, A. Palyi, Impurity-assisted electric control of spin-valley qubits in monolayer MoS2, 2D Materials 5, 035004 (2018)

Presenters

  • Andras Palyi

    Budapest University of Technology and Economics

Authors

  • Andras Palyi

    Budapest University of Technology and Economics