0 v 1 8 D ec 1 99 6 REPAIRING BELL ’ S THEOREM FOR A CLASS OF DOWN - CONVERSION EXPERIMENTS

0 v 2 2 5 Ju n 19 97 REVISITING BELL ’ S THEOREM FOR A CLASS OF DOWN - CONVERSION EXPERIMENTS

A certain class of parametric down-conversion Bell type experiments has the following features. In the idealized perfect situation it is in only 50% of cases that each observer receives a photon; in the other 50% of cases one observer receives both photons of a pair while the other observer receives none. The standard approach is to discard the events of the second type. Only the remaining ones...

0 v 2 8 D ec 1 99 9 Accelerator and Reactor Neutrino Experiments

ar X iv : h ep - p h / 99 12 28 8 v 1 1 0 D ec 1 99 9 Lattice Calculations and Hadron Physics

/ 99 12 23 7 v 1 1 0 D ec 1 99 9 Magnetic Field Limits on SGRs

We measure the period and spin-down rate for SGR 1900+14 during the quiescient period two years before the recent interval of renewed burst activity. We find that the spin-down rate doubled during the burst activity which is inconsistent with both mangetic dipole driven spin down and a magnetic field energy source for the bursts. We also show that SGRs 1900+14 and 1806-20 have braking indices o...

ua nt - p h / 98 12 01 2 v 1 5 D ec 1 99 8 Maximally entangled states and the Bell inequality ∗

Kar’s recent proof showing that a maximally entangled state of two spin-1/2 particles gives the largest violation of a Bell inequality is extended to N spin-1/2 particles (N ≥ 3). In particular, it is shown that all the states yielding a direct contradiction with the assumption of local realism do generally consist of a superposition of maximally entangled states. Recently, Kar (see Ref. [1], a...