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Dr. John C. Howell Department of Physics and Astronomy   University of Rochester

                                                                                             

Cloning:

Quantum cloning is the process of copying the quantum state of one
particle onto another particle with the minimum of disturbance to the
original particle. The process, however, is not physically possible
without perturbing the system of interest; therefore any cloning procedure
necessarily contains errors even in the ideal, physically allowable
situation. Despite these errors, this procedure could be potentially used
for eavesdropping on a quantum cryptographic channel, or for improving
efficiencies of certain quantum computing algorithms. It therefore must
be taken into account for security protocols in quantum cryptography.

We utilize the process of parametric down conversion to generate
polarization correlated photons which can be utilized for various
interesting quantum information and fundamental physics experiments. We
have shown, for example, that quantum cloning of an arbitrary linearly
polarized state of a photon can be accomplished by simply interfering it
with a circularly polarized photon (which is indistinguishable in all
other quantum variables) at a non-polarizing beam splitter.

Publications: here and here
 

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               Physics and Astronomy
            Quantum Optics & Quantum Information
               University of Rochester