ua nt - p h / 04 06 04 2 v 2 1 5 Ju n 20 04 Compelet Correlation , Detection loophole and Bell ’ s Theorem
نویسنده
چکیده
Two new formulations of Bell’s theorem are given here. First, we consider a definite set of two entangled photons with only two polarization directions, for which Bell’s locality assumption is violated for the case of perfect correlation. Then, using a different approach, we prove an efficient Bell-type inequality which is violated by some quantum mechanical predictions, independent of the efficiency factors.
منابع مشابه
ua nt - p h / 04 06 04 2 v 3 2 5 Ju l 2 00 4 Complete Correlation , Detection loophole and Bell ’ s Theorem
Two new formulations of Bell’s theorem are given here. First, we consider a definite set of two entangled photons with only two polarization directions, for which Bell’s locality assumption is violated for the case of perfect correlation. Then, using a different approach, we prove an efficient Bell-type inequality which is violated by some quantum mechanical predictions, independent of the effi...
متن کاملar X iv : q ua nt - p h / 99 06 04 9 v 1 1 5 Ju n 19 99 Bell inequality and the locality loophole : Active versus passive switches
All experimental tests of the violation of Bell’s inequality suffer from some loopholes. We show that the locality loophole is not independent of the detection loophole: in experiments using low efficient detectors, the locality loophole can be closed equivalently using active or passive switches.
متن کاملua nt - p h / 04 06 10 2 v 1 1 5 Ju n 20 04 Vacuum fluctuations and the conditional homodyne detection of squeezed light
Conditional homodyne detection of quadrature squeezing is compared with standard nonconditional detection. Whereas the latter identifies nonclassicality in a quantitative way, as a reduction of the noise power below the shot noise level, conditional detection makes a qualitative distinction between vacuum state squeezing and squeezed classical noise. Implications of this comparison for the real...
متن کاملua nt - p h / 04 06 15 6 v 1 2 2 Ju n 20 04 Nonlocality tests of Bell Inequalities and of Hardy ’ s ” ladder theorem ” without ” supplementary assumptions ”
We have experimentally tested the non local properties of the states generated by a high brilliance source of entanglement which virtually allows the direct measurement of the full set of photon pairs created by the basic QED process implied by the parametric quantum scattering. Standard Bell measurements and Bell’s inequality violation test have been realized over the entire cone of emission o...
متن کاملua nt - p h / 04 07 08 5 v 1 1 3 Ju l 2 00 4 Bell ’ s Theorem - Why Inequalities , Correlations ?
It is shown that Bell’s counterfactuals admit joint quasiprobability distributions (i.e. joint distributions exist, but may not be nonnegative). A necessary and sufficient condition for the existence among them of a true probability distribution (i.e. nonnegative) is Bell’s inequalities. This, in turn, is a necessary condition for the existence of local hidden variables. The treatment is amenab...
متن کامل