P. L. Knight

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We investigate the time T a quantum computer requires to factorize a given number dependent on the number of bits L required to represent this number. We stress the fact that in most cases one has to take into account that the execution time of a single quantum gate is related to the decoherence time of the qubits that are involved in the computation.(More)
We argue from the point of view of statistical inference that the quantum relative entropy is a good measure for distinguishing between two quantum states ͑or two classes of quantum states͒ described by density matrices. We extend this notion to describe the amount of entanglement between two quantum systems from a statistical point of view. Our measure is(More)