Near-Landauer-Bound quantum computing using single spins

This study is the first experimental verification of Landauer's bound on a single spin, which is the smallest information carrier in size. We used four experiments (single spin experiment, giant spin experiment, nanomagnet experiment and Stern-Gerlach experiment) to demonstrate that a single spin was much more energy-efficient than other information carriers due to its small size and weak coupling with the surroundings. We conclude that quantum spintronics, with single spins as qubits, is an energy-efficient computing paradigm that requires the smallest amount of energy (〖1.2×10〗^(-26) J per spin qubit, close to the theoretical Landauer bound of 〖9.6×10〗^(-27) J at 1 mK), to perform computations.