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["Balog Janos" <balog AT rmki.kfki.hu>]

KFKI RMKI Elméleti Főosztály Szemináriuma


Tisztelettel meghívjuk


                       Hideyuki Sakai
                    (University of Tokyo)

"Einstein was wrong? EPR paradox and a test of Bell inequality by         
proton pairs"



                címmel tartandó szemináriumára.


Helye: KFKI RMKI III. ép. Tanácsterem
Ideje: 2011. október 6. csütörtök du. 14 óra


Kivonat:

     We have carried out the spin-correlation measurement of two protons
in a spin singlet state aiming to test the EPR paradox presented by
Einstein, Podolsky
and Rosen in 1935. The EPR proposed a thought experiment in which they
showed according
to quantum mechanics that the result of a measurement of an entangled
quantum system
performed on earth, for example, can instantaneously influence the result
of a measurement
performed on the far distant Galaxy regardless of the distance. This of
course contradicts
with the theory of special relativity by Einstein, no information can be
transmitted faster
than the speed of light. Therefore EPR argued that quantum mechanics must
be incomplete.
    In 1964, Bell found an extremely important inequality which is the
embodiment
of the EPR arguments. The prediction of the spin-correlation by the Bell's
inequality
is different from that by the quantum mechanics so that we can test
experimentally
which assertion is right by the measurement.
After a short introduction of the EPR paradox, I try to explain how we
realized
experimentally an almost pure spin singlet state of two protons and how we
measured
the spin polarizations of two protons. Essential difference from photon
pair experiments will be touched.





Szívesen látunk minden érdeklődőt.
                                            Balog János