ua nt - p h / 97 09 05 9 v 1 3 0 Se p 19 97 Against Measurement ? – On the Concept of Information

ua nt - p h / 97 09 05 9 v 2 2 7 A ug 1 99 8 Against Measurement ? – On the Concept of Information 1

In his last article Against ‘Measurement’ J. S. Bell sums up his well known critique of the problem of explaining the measurement process within the framework of quantum theory. In this article I will discuss the measurement process by analysing the concept of measurement from the epistemological point of view and I will argue against Bell that it belongs to the preconditions of experience to n...

ua nt - p h / 05 09 21 8 v 1 3 0 Se p 20 05 N - qubit entanglement via the J 2 y - type collective interaction

ua nt - p h / 97 07 05 5 v 1 3 0 Ju l 1 99 7 Nonlinear Quantum Mechanics and Locality ∗

It is shown that, in order to avoid unacceptable nonlocal effects, the free parameters of the general Doebner-Goldin equation have to be chosen such that this nonlinear Schrödinger equation becomes Galilean covariant.

ar X iv : q ua nt - p h / 97 11 05 9 v 3 1 6 A pr 1 99 8 Strictly isospectral supersymmetry and Schroedinger general zero modes

The connection between the strictly isospectral construction in supersymmetric quantum mechanics and the general zero mode solutions of the Schroedinger equation is explained by introducing slightly generalized first-order intertwining operators. We also present a multiple-parameter generalization of the strictly isospectral construction in the same perspective.

ua nt - p h / 97 06 04 0 v 1 1 8 Ju n 19 97 QUANTIZATION OF A PARTICLE IN A BACKGROUND YANG - MILLS FIELD

Two classes of observables defined on the configuration space of a particle are quantized, and the effects of the Yang-Mills field are discussed in the context of geometric quantization.