منابع مشابه
Robustness and diffusion of pointer states
Classical properties of an open quantum system emerge through its interaction with other degrees of freedom (decoherence). We treat the case where this interaction produces a Markovian master equation for the system. We derive the corresponding distinguished local basis (pointer basis) by three methods. The first demands that the pointer states mimic as closely as possible the local nonunitary ...
متن کاملDecoherence-induced continuous pointer states.
We investigate the reduced dynamics in the Markovian approximation of an infinite quantum spin system linearly coupled to a phonon field at positive temperature. The achieved diagonalization leads to a selection of the continuous family of pointer states corresponding to a configuration space of the one-dimensional Ising model. Such a family provides a mathematical description of an apparatus w...
متن کاملUnconditional pointer states from conditional master equations.
When part of the environment responsible for decoherence is used to extract information about the decohering system, the preferred pointer states remain unchanged. This conclusion--reached for a specific class of models--is investigated in a general setting of conditional master equations using suitable generalizations of predictability sieve. We also find indications that the einselected state...
متن کاملDecoherence of quantum fields: Pointer states and predictability.
We study environmentally induced decoherence of an electromagnetic eld in a homogeneous, linear, dielectric medium. We derive an independent oscillator model for such an environment, which is su ciently realistic to encompass essentially all of linear physical optics. Applying the \predictability sieve" to the quantum eld, and introducing the concept of a \quantum halo", we recover the familiar...
متن کاملDecoherence and pointer states in small antiferromagnets: A benchmark test
We study the decoherence process of a four spin-1/2 antiferromagnet that is coupled to an environment of spin-1/2 particles. The preferred basis of the antiferromagnet is discussed in two limiting cases and we identify two exact pointer states. Decoherence near the two limits is examined whereby entropy is used to quantify the robustness of states against environmental coupling. We find that cl...
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ژورنال
عنوان ژورنال: Physical Review Letters
سال: 2000
ISSN: 0031-9007,1079-7114
DOI: 10.1103/physrevlett.85.3552