236 research outputs found

    Physical implementation of entangling quantum measurements

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    We clarify the microscopic structure of the entangling quantum measurement superoperators and examine their possible physical realization in a simple three-qubit model, which implements the entangling quantum measurement with an arbitrary degree of entanglement.Comment: 6 pages, 2 fihure

    Generalized quantum measurements. Part I: Information properties of soft quantum measurements

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    A special class of soft quantum measurements as a physical model of the fuzzy measurements widely used in physics is introduced and its information properties are studied in detail.Comment: 25 pages, 3 figures, 25 ref

    Coherent and compatible information: a basis to information analysis of quantum systems

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    Relevance of key quantum information measures for analysis of quantum systems is discussed. It is argued that possible ways of measuring quantum information are based on compatibility/incompatibility of the quantum states of a quantum system, resulting in the coherent information and introduced here the compatible information measures, respectively. A sketch of an information optimization of a quantum experimental setup is proposed.Comment: 10 pages, 5 figures, submitted to the Procs of 17th Int'l Conf. on Coherent and Nonlinear Optics (ICONO-2001), June 26-July 1, 2001, Minsk, Belaru

    Entangling quantum measurement and its properties

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    We study the mathematical structure of superoperators describing quantum measurements, including the \emph{entangling measurement}--the generalization of the standard quantum measurement that results in entanglement between the measurable system and apparatus. It is shown that the coherent information can be effectively used for the analysis of such entangling measurements whose possible applications are discussed as well.Comment: 8 pages, 1 figure; accepted for publication in Phys. Rev.
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