Titlebook: Quantum Communication, Computing, and Measurement 3; Paolo Tombesi,Osamu Hirota Book 2002 Springer Science+Business Media New York 2002 Si

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978-1-4419-3364-5Springer Science+Business Media New York 2002

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Spontaneous Intrinsic Decoherence in Rabi Oscillations Experimentsze a previous formalism to describe also nonexponential decay. The possibility of spontaneous intrinsic decoherence (SID), i.e., not due to interaction with environment or fluctuation of some internal parameter but of purely quantum mechanical origin, is discussed. Moreover an experimental cavity QED test of SID is suggested.

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Decoherence Versus the Idealization of Microsystems as Correlation Carriers Between Macrosystemsistical mechanics for the compound source-detector system. An attempt is given to elucidate how this idealized notion of microsystem might arise inside a field theoretical description of isolated macrosystems: then decoherence appears as the natural limit of this idealization.

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ON the Number of Elements Needed in a POVM Attaining the Accessible Informationw that for the ensemble consisting of the three lifted trine states taken with equal probabilities, the POVM measurement realizing the accessible information must contain six projectors, giving a counter-example to a conjecture of Levitin.

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Superadditivity With Mixed Letter StatesIn this paper we numerically derived . . of the binary mixed state signal. The mutual informations of codeword states, . . and . ., were calculated and were compared with . . and .. The expected amount of the superadditivity was given when the pure state preparation is too difficult in experimental set up.

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Superadditivity in Capacity of Quantum Channel by Classical Pseudo-Cyclic CodesAnalytical solution of mutual information by square-root measurement for binary linear code is given. Applying the solution, we show properties of superadditivity in capacity by BCH codes with codeword length 15 and 31. Furthermore, we refer to codes almost achieving the quantum channel capacity.