 The output state produced is governed by the Hamiltonian of the system.One of the first cloning machines, a 1 to 2 UQC machine, was proposed in 1996 by Buzek and Hillery.As the name implies, the machine produces two identical copies of a single input qubit with a fidelity of 5/6 when comparing only one output qubit, and global fidelity of 2/3 when comparing both qubits.