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Of all the numerous interacting two-level systems considered as candidates for qubits in scalable quantum computing (trapped ions, photons, quantum dots, nanoscale superconducting devices and condensates, nuclear and electronic spins) only the latter represent clearly identifiable and selectively addressable qubits even in mixed ensembles that nevertheless have a reproducible thermal ground state, a universal set of easily implemented quantum gates involving multiquantum entanglement and squeezing, low decoherence, and through macroscopic bulk parallelism, both precise projective readout and the possibility of some nondestructive measurements during computation. The object of the proposed grant is to build a scalable spin-based system for massively parallel thermal ensemble quantum computing with spin-selective excitation and readout, error avoidance at the ensemble average level, and a scalable cellular structure of multiple computing clusters of not more than one to two dozen interacting spins each. The first option is to use heteronuclear high resolution NMR (360 to 600 MHz for 1H) and later to study the feasilibity of using magnetic electron spin clusters in the tunable Terahertz range in an up to 12 Tesla magnetic field. |