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The method for preparation of a two-qubit state on two spins-1/2 thatmutually interact through an auxiliary spin is proposed. The essence of themethod is that, initially, the three spins evolve under the action of anexternal magnetic field during a predefined period of time. Then, the auxiliaryspin is measured by a monochromatic electromagnetic radiation that allowsobtaining a certain state of the remaining spins. We study the entanglement ofthis state and obtain the condition for achieving the maximally entangledstate. The implementation of the method on the physical system of nuclear spinsof xenon difluoride is described. As a results, the conditions which allowpreparing the maximally entangled state on this system are obtained.

Implementation of a two-qubit state by an auxiliary qubit on the three-spin system