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Copying the quantum states is contradictory to classical informationprocessing since the fundamental difference between classical and quantuminformation is that while classical information can be copied perfectly,quantum information cannot. However, this statement does not rule out the riskof building a device that can reproduce a set of quantum states. This paperinvestigates the naturally arising question of how well or under whatconditions one can copy and measure an arbitrary quantum superposition ofstates. The CNOT and XOR operation-based quantum circuit is presented thatexhibits entanglement of states and allows for measuring the doubled qubits.

Algorithm and Circuit of Nesting Doubled Qubits