PREVENTION OF DISSIPATION WITH 2-PARTICLES

An error prevention procedure based on two-particle encoding is propos ed for protecting an arbitrary unknown quantum state from dissipation, such as phase damping and amplitude damping. The schemes, which exhib its manifestation of the quantum Zeno effect; is effective whether qua ntum bits are decohered independently or cooperatively. We derive the working condition of the scheme, and argue that this procedure has fea sible practical implementation.