Physics – Quantum Physics
Scientific paper
2009-11-06
Phys. Rev. A 80, 062306 (2009).
Physics
Quantum Physics
6 pages, 4 figures, REVTeX 4, to appear in Phys. Rev. A
Scientific paper
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 relative 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.
Celechovska Lucie
Cernoch Antonin
Dusek Miloslav
Fiurasek Jaromir
Soubusta Jan
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