  The marriage of Quantum Physics and Information Technology, originally
motivated by the need for miniaturization, has recently opened the way to the
realization of radically new information-processing devices, with the
possibility of guaranteed secure cryptographic communications, and tremendous
speedups of some complex computational tasks. Among the many problems posed by
the new information technology there is the need of characterizing the new
quantum devices, making a complete identification and characterization of their
functioning. As we will see, quantum mechanics provides us with a powerful tool
to achieve the task easily and efficiently: this tools is the so called quantum
entanglement, the basis of the quantum parallelism of the future computers. We
present here the first full experimental quantum characterization of a
single-qubit device. The new method, we may refer to as ''quantum
radiography'', uses a Pauli Quantum Tomography at the output of the device, and
needs only a single entangled state at the input, which works on the test
channel as all possible input states in quantum parallel. The method can be
easily extended to any n-qubits device.
