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Quantum Computing in Solid State Systems
We describe a new approach to the measurement of the state of a collapsed single spin by using many entangled spins as an amplifier. A single target spin is coupled via the natural dipolar Hamiltonian to a large collection of spins. Applying external radio frequency (r.f.) pulses, we can control the evolution of the system so that the ensemble spins reach one of two orthogonal states whose collective properties differ depending on the state of the target spin and are easily measured. We reportdoi:10.1007/0-387-31143-2_37 fatcat:5w4gmnieprc7ldlk2ueo45xliu