J. P. Paz, S. Habib, and W. H. Zurek, "Reduction of the wave packet: Preferred observable and decoherence time scale," Phys. Rev. D 47, pp. 488--501, 1993.  Home/Search   Document Not in Database   Summary   APS   Related Articles   Check

.... the noise arising from the coupling of a quantum system to an environment also induces decoherence: any generic quantum state will rapidly decohere into a mixture of certain preferred states (the so called pointer 113 states ) which are most stable with respect to environment induced decoherence [107]. The most fundamental example is the spin boson system [108] i.e. a twostate system coupled to a bath of harmonic oscillators. For most parameters (except low temperatures and weak coupling) incoherent tunneling between the left and right state (which are defined by the coupling to the ....

J. P. Paz, S. Habib, and W. H. Zurek, Reduction of the Wave Packet: Preferred Observable and Decoherence Time Scale,Phys.Rev.D47, 488 (1993).

....states also equal to D. Since all systems are really quantum mechanical, we might ask how the classical system may be represented in the formalism of quantum mechanics. The answer, which is the form of classical quantum correspondence I use, lies at least partly in the notion of decoherence [4, 5, 6, 7]. This is the idea that physical systems which behave classically are those which interact with their environment in such a way that the environment effectively measures them in some preferred basis. This process need not be literally a measurement. For example, any unitary 14 interaction ....

J. P. Paz, S. Habib, and W. H. Zurek, "Reduction of the wavepacket: Preferred observable and decoherence timescale," Phys. Rev. D, vol. 47, pp. 488--501, 1993.

.... process by which a quantum system initially in a pure state evolves into a mixed state as it interacts with its environment has been studied both in toy models designed to elucidate aspects of quantum measurement [1 4] and in more complex ones modelling realistic physical situations [3,5 7]. In the purely quantum mechanical models the Hilbert space factors as a tensor product H = H sys Omega H env of Hilbert spaces describing the degrees of freedom of the system and environment, respectively. From the complete state j Psii 2 H one forms the density operator ae : j Psii Omega ....

....matrix (1) with the particle in an initial equal superposition of chiralities and localized in a Gaussian around x = 0. From top to bottom, the curves are for increasing mass. Decoherence is usually studied for an initial state which is a tensor product pure state j Psi sys i Omega j Psi env i [1 7], so consider the case (x; 0) f(x) Gamma 1 1 Delta , where f(x) is proportional to e Gammax 2 =2 and is normalized so that R y (x; 0) x; 0) dx = 1. That is, the particle is initially in an equal superposition of negative and positive chiralities and is localized near x = 0. ....

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J. P. Paz, S. Habib and W. H. Zurek, "Reduction of the wave packet: Preferred observables and decoherence time scale", Phys. Rev. D 47 (1993) 488--501.

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J. P. Paz, S. Habib, and W. H. Zurek, "Reduction of the wave packet: Preferred observable and decoherence time scale," Phys. Rev. D 47, pp. 488--501, 1993.

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J. P. Paz, S. Habib, and W. H. Zurek, "Reduction of the wave packet: Preferred observable and decoherence time scale," Phys. Rev. D 47, pp. 488--501, 1993.

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