Experimental demonstration of optimal universal asymmetric quantum cloning of polarization states of single photons by partial symmetrization

Antonín Černoch, Jan Soubusta, Lucie Čelechovská, Miloslav Dušek, Jaromír Fiurášek
2009 Physical Review A. Atomic, Molecular, and Optical Physics  
We report on experimental implementation of the optimal universal asymmetric 1->2 quantum cloning machine for qubits encoded into polarization states of single photons. Our linear optical machine performs asymmetric cloning by partially symmetrizing the input polarization state of signal photon and a blank copy idler photon prepared in a maximally mixed state. We show that the employed method of measurement of mean clone fidelities exhibits strong resilience to imperfect calibration of the
more » ... ive efficiencies of single-photon detectors used in the experiment. Reliable characterization of the quantum cloner is thus possible even when precise detector calibration is difficult to achieve.
doi:10.1103/physreva.80.062306 fatcat:wv5jtn6s3fbp7ns4wlo23yi6se