5 research outputs found
Comprehensive experimental test of quantum erasure
In an interferometer, path information and interference visibility are
incompatible quantities. Complete determination of the path will exclude any
possibility of interference, rendering the visibility zero. However, if the
composite object and probe state is pure, it is, under certain conditions,
possible to trade the path information for improved (conditioned) visibility.
Such a procedure is called quantum erasure. We have performed such experiments
with polarization entangled photon pairs. Using a partial polarizer we could
vary the degree of entanglement between object and probe. We could also vary
the interferometer splitting ratio and thereby vary the a priori path
predictability. We have tested quantum erasure under a number of different
experimental conditions and found good agreement between experiments and
theory.Comment: 8 pages, 8 figures, REVTe
Complementarity and the uncertainty relations
We formulate a general complementarity relation starting from any Hermitian
operator with discrete non-degenerate eigenvalues. We then elucidate the
relationship between quantum complementarity and the Heisenberg-Robertson's
uncertainty relation. We show that they are intimately connected. Finally we
exemplify the general theory with some specific suggested experiments.Comment: 9 pages, 4 figures, REVTeX, uses epsf.sty and multicol.st