Improvement of Uncertainty Relations for Mixed States

Details Improvement of Uncertainty Relations for Mixed States Improvement of Uncertainty Relations for Mixed States

2004-09-03

arxiv.org/abs/math-ph/0409008v1

Physics

Mathematical Physics

Scientific paper

10.1063/1.1876874

We study a possible improvement of uncertainty relations. The Heisenberg uncertainty relation employs commutator of a pair of conjugate observables to set the limit of quantum measurement of the observables. The Schroedinger uncertainty relation improves the Heisenberg uncertainty relation by adding the correlation in terms of anti-commutator. However both relations are insensitive whether the state used is pure or mixed. We improve the uncertainty relations by introducing additional terms which measure the mixtureness of the state. For the momentum and position operators as conjugate observables and for the thermal state of quantum harmonic oscillator, it turns out that the equalities in the improved uncertainty relations hold.

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