6,357 research outputs found

    The Stage Through Slanted Eyes: An Examination of the Current State of Asian Americans in Theatre

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    Deep-set racial prejudices and stereotypes in American society greatly impact how Asian Americans are perceived onstage and in everyday life. The Stage Through Slanted Eyes: An Examination of the Current State of Asian Americans in Theatre delves into the history of these prejudices and looks at how a performer\u27s race can impact his or her theatrical career

    Concatenated Quantum Codes

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    One of the main problems for the future of practical quantum computing is to stabilize the computation against unwanted interactions with the environment and imperfections in the applied operations. Existing proposals for quantum memories and quantum channels require gates with asymptotically zero error to store or transmit an input quantum state for arbitrarily long times or distances with fixed error. In this report a method is given which has the property that to store or transmit a qubit with maximum error ϵ\epsilon requires gates with error at most cϵc\epsilon and storage or channel elements with error at most ϵ\epsilon, independent of how long we wish to store the state or how far we wish to transmit it. The method relies on using concatenated quantum codes with hierarchically implemented recovery operations. The overhead of the method is polynomial in the time of storage or the distance of the transmission. Rigorous and heuristic lower bounds for the constant cc are given.Comment: 16 pages in PostScirpt, the paper is also avalaible at http://qso.lanl.gov/qc

    Decoherence Functional and Inhomogeneities in the Early Universe

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    We investigate the quantum to classical transition of small inhomogeneous fluctuations in the early Universe using the decoherence functional of Gell-Mann and Hartle. We study two types of coarse graining; one due to coarse graining the value of the scalar field and the other due to summing over an environment. We compare the results with a previous study using an environment and the off-diagonal rule proposed by Zurek. We show that the two methods give different results.Comment: 15 pages in plain te
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