Separating the Classical and Quantum Information via Quantum Cloning
Marco Ricci, Fabio Sciarrino, Nicolas J. Cerf, Radim Filip, Jaromı́r Fiurášek, F. De Martini · Physical Review Letters · 2005
An application of quantum cloning to optimally interface a quantum system with a classical observer is presented; in particular, we describe a procedure to perform a minimal disturbance measurement on a single qubit by adopting a 1-->2 cloning machine followed by a generalized measurement on a single clone and the anticlone or on the two clones. Such a scheme can be applied to enhance the transmission fidelity over a lossy quantum channel.