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It is known that a quantum system with finite degrees of freedom can simulatea composite of a system and an environment if the state of the hypotheticalenvironment is randomized by external manipulation. We show theoretically thatany phase decoherence phenomena of a single qubit can be simulated with atwo-qubit system and demonstrate experimentally two examples: one is phasedecoherence of a single qubit in a transmission line, and the other is that ina quantum memory. We perform NMR experiments employing a two-spin molecule andclearly measure decoherence for both cases. We also prove experimentally thatthe bang-bang control efficiently suppresses decoherence.Comment: 25 pages, 7 figures; added reference

Generation and Suppression of Decoherence in Artificial Environment for Qubit System