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cond-mat.str-el1999
On some upper bounds for spin velocity and instability of gapless state of 1-d Heisenberg chains
Konstantin Kladko
We derive upper bounds for spin velocity in half-integer-spin Heisenberg antiferromagnetic chains. We relate these upper bounds to the instability of the gapless state, which is ob…
quant-ph1999
Einstein-Podolsky-Rosen paradox and measurement of quantum system
Konstantin Kladko
Einstein-Podolsky-Rosen (EPR) paradox is considered in a relation to a measurement of an arbitrary quantum system . It is shown that the EPR paradox always appears in a gedanken ex…