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Quantum Information and Computation     ISSN: 1533-7146      published since 2001
Vol.3 Special, September 2003

Precise creation, characterization, and manipulation of single optical qubits (pp503-517)
        N. Peters, J. Altepeter, E. Jeffrey, D. Branning, and P. Kwiat
         
doi: https://doi.org/10.26421/QIC3.s-4

Abstracts: We present the theoretical basis for and experimental verification of arbitrary single-qubit state generation, using the polarization of photons generated via spontaneous parametric downconversion. Our precision measurement and state reconstruction system has the capability to distinguish over 3 million states, all of which can be reproducibly generated using our state creation apparatus. In order to complete the triumvirate of single qubit control, there must be a way to not only manipulate single qubits after creation and before measurement, but a way to characterize the manipulations themselves. We present a general representation of arbitrary processes, and experimental techniques for generating a variety of single qubit manipulations, including unitary, decohering, and (partially) polarizing operations.
Key words: photon polarization, qubit, quantum process, tomography, parametric down-conversion

 

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