Quantum computation strongly relies on the realisation, manipulation and control of qubits. A central method for realizing qubits is by creating a double-well potential system with a significant gap between the first two eigenvalues and the rest. In this work we first revisit the theoretical grounds underlying the double-well qubit dynamics, then proceed to suggest novel extensions of these principles to a triple-well qutrit with periodic boundary conditions, followed by a general d-well analysis of qudits. These analyses are based on representations of the special unitary groups SU(d) which expose the systems' symmetry and employ them for performing computations. We conclude with a few notes on coherence and scalability of d-well systems.
Landau, A., Aharonov, Y., Cohen, E., 2016. Realization of qudits in coupled potential wells. Int. J. Quantum Inform. 14, 1650029. doi:10.1142/S0219749916500295
Available for download on Wednesday, August 23, 2017