Titlebook: Quantum Communication, Computing, and Measurement 2; P. Kumar,G. M. D’Ariano,O. Hirota Book 2002 Springer Science+Business Media New York

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Measuring the Quantum Polarization State of Lightents using dual-polarization balanced homodyne detection is shown to be . with respect to the statistics of the SU(2) Stokes operators on the Poincaré sphere. Complete reconstruction of the polarization sector of the density matrix of a partially polarized optical field can be achieved while randomi

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municationsystems, cryptography, new quantum effects and their experiments,generation and detection of nonclassical light, quantum noise,stochastic processes and filtering, and quantum measurement theory.978-1-4757-8675-0978-0-306-47097-4

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Group Covariant Signals in Quantum Information Theoryals.” We show by applying this condition that many signals, such as arbitrary binary signals, PPM, FSK, and PSK coherent-state signals, equidistant codes, and binary linear codes, are all group covariant.

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Entanglement of Formationthe entanglement of formation, as well as a related quantity called the tangle. The tangle can be used to express a simple law of entanglement, limiting the extent to which a single qubit may be simultaneously entangled with each of two other qubits.

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Optimal Signal-to-Quantum Noise Ratio in Squeezed Displaced Number States . has the value 4. .(. .+1), attainable by the squeezed coherent vacuum. The question arises as to what ρ is attainable when the vacuum is imperfect, and there are . photons present. We show that in such a situation the attainable signal-to-quantum noise ratio ρ is reduced by a factor (2.+1)..

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978-1-4757-8675-0Springer Science+Business Media New York 2002

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Quantum Communication with Imperfect MeansRecent results forentanglement purification with imperfect local operations and measurements are revisited and applied to the quantum repeater problem.

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On Quantum Channel Capacity for Squeezed StatesThis paper presents the classical capacities of quantum Gaussian channels using squeezed states. The calculation is based on a general formula for the entropy of quantum Gaussian state.