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The representation of sound frequency (and of the cochlear partition) within primary auditory cortex has been investigated with use of microelectrode-mapping techniques in a series of 25 anesthetized cats. Among the results were the following: 1) Within vertical penetrations into AI, best frequency and remarkably constant for successively studied neurons(More)
We present an economical dynamical control scheme to perform quantum computation on a one-dimensional optical lattice, where each atom encodes one qubit. The model is based on atom tunneling transitions between neighboring sites of the lattice. They can be activated by external laser beams resulting in a two-qubit phase gate or in an exchange interaction. A(More)
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)
V. Bužek, 1,2 V. Vedral, 1 M. B. Plenio, 1 P. L. Knight, 1 and M. Hillery 3 Optics Section, The Blackett Laboratory, Imperial College, London SW7 2BZ, England Institute of Physics, Slovak Academy of Sciences, Dubravská cesta 9, 842 28 Bratislava, Slovakia Department of Physics and Astronomy, Hunter College, City University of New York, 695 Park Avenue, New(More)