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

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

2009-11-06

arxiv.org/abs/0911.1227v1

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.

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