Three-Qubit Gate Realization Using Single Quantum Particle
A. R. Kessel, Vladimir L. Ermakov · arXiv (Cornell University) · 2000
Using virtual spin formalism it is shown that a quantum particle with eight energy levels can store three qubits. The formalism allows to realize a universal set of quantum gates. Feasible formalism implementation is suggested which uses nuclear spin-7/2 as a storage medium and radio frequency pulses as the gates. One pulse realization of all universal gates has been found, including three-qubit Toffoli gate.