Towards High-Dimensional Quantum States in Trilayer WSe₂ Quantum Dots

As the unit for building quantum circuits, qubits have been broadly studied for quantum information processing. Recently, quantum states with higher dimensions, also known as qudits, are attracting more attention due to their potential advantages, including simplifying quantum computation. Experimentally, quantum dots can be used to build qubits, but their applications for qudits are limited. Here we use trilayer WSe₂, which has 6 inequivalent valleys inside the 1st Brillouin zone [1], to make quantum dot devices. Several electrodes are used as electrostatic gates to define a dot region in the device. Preliminary data from the first generation of devices shows Coulomb blockade features, indicating the presence of a quantum dot [2]. By shrinking the dot region and applying electric and magnetic fields, better manipulation of 3- or 6-fold nearly degenerate quantum states can be achieved [3]. Our latest results will be discussed.



[1] Z. Bao et al., arXiv:1903.01967.

[2] J. Boddison-Chouinard et al., Appl. Phys. Lett. 119, 133104 (2021).

[3] S. Davari et al., Phys. Rev. Appl. 13, 054058 (2020).