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Construction of quantum states with bound entanglement
Dagmar Bruss, Asher Peres
We present a new family of bound-entangled quantum states in 3x3 dimensions. Their density matrix depends on 7 independent parameters and has 4 different non-vanishing eigenvalues.
Opposite momenta lead to opposite directions
Asher Peres
When a particle decays into two fragments, the wavefunctions of the latter are spherical shells with expanding radii. In spite of this spherical symmetry, the two particles can be…
Popper's experiment and the Copenhagen interpretation
Asher Peres
Popper conceived an experiment whose analysis led to a result that he deemed absurd. Popper wrote that his reasoning was based on the Copenhagen interpretation and therefore invali…
Classical interventions in quantum systems. II. Relativistic invariance
Asher Peres
If several interventions performed on a quantum system are localized in mutually space-like regions, they will be recorded as a sequence of ``quantum jumps'' in one Lorentz frame,…
Classical interventions in quantum systems. I. The measuring process
Asher Peres
The measuring process is an external intervention in the dynamics of a quantum system. It involves a unitary interaction of that system with a measuring apparatus, a further intera…
Bayesian analysis of Bell inequalities
Asher Peres
Statistical tests are needed to determine experimentally whether a hypothetical theory based on local realism can be an acceptable alternative to quantum mechanics. It is impossibl…