Precise Creation, Characterization, and Manipulation of Single Optical Qubits

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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 \emph{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.
15 pages, 8 figures

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Quantum Physics

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http://salesiana.dossiersoluciones.com/handle/123456789/92728

Consulte el texto completo en el siguiente enlace:

https://arxiv.org/abs/quant-ph/0502177
 http://arxiv.org/abs/quant-ph/0502177
 Quantum Information Computation v3 p 503 (2003)

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arXiv