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Ergodic and mixing quantum channels in finite dimensions
The paper provides a systematic characterization of quantum ergodic and mixing channels in finite dimensions and a discussion of their structural properties. In particular, we discuss ergodicity in
Modified Fowler-Nordheim field emission formulae from a nonplanar emitter model
Field emission formulae, current–voltage characteristics and energy distribution of emitted electrons, are derived analytically for a nonplanar (hyperboloidal) metallic emitter model. The traditional
Purification through Zeno-like measurements.
A series of frequent measurements on a quantum system (Zeno-like measurements) is shown to result in the "purification" of another quantum system in interaction with the former. Even though the
Preparation and entanglement purification of qubits through Zeno-like measurements
A method of purification, purification through Zeno-like measurements [H. Nakazato, T. Takazawa, and K. Yuasa, Phys. Rev. Lett. 90, 060401 (2003)], is discussed extensively and applied to a few
Generalized Adiabatic Theorem and Strong-Coupling Limits
We generalize Kato's adiabatic theorem to nonunitary dynamics with an isospectral generator. This enables us to unify two strong-coupling limits: one driven by fast oscillations under a Hamiltonian,
Quantum Estimation via Sequential Measurements
The problem of estimating a parameter of a quantum system through a series of measurements performed sequentially on a quantum probe is analyzed in the general setting where the underlying statistics
Bifurcation phenomenon in spin relaxation.
A bifurcation phenomenon in temperature dependence of relaxation constants, which is never observed in the weak-coupling regime, is found.
Hamiltonian Purification
Davide Orsucci, Daniel Burgarth, Paolo Facchi, 4 Hiromichi Nakazato, Saverio Pascazio, 4 Kazuya Yuasa, and Vittorio Giovannetti Scuola Normale Superiore, I-56126 Pisa, Italy. Department of
Stochastic limit approximation for rapidly decaying systems
The stochastic limit approximation method for ``rapid'' decay is presented, where the damping rate \gamma is comparable to the system frequency \Omega, i.e., \gamma \sim \Omega, whereas the usual
Estimating temperature via sequential measurements
We study the efficiency of estimation procedures where the temperature of an external bath is indirectly recovered by monitoring the transformations induced on a probing system that is put in thermal