Reproducing method and reproducing apparatus for optical recording medium

摘要

A technique for improving a number of reproducible times in reproduction of information from an optical recording medium having a recording layer which reacts in a photon mode. The power of a reproducing beam is set in proximity to Prep (W) appearing in the following expression (I) or within a range of Prep (W) appearing in the following expression (II): <IMAGE> (I) <IMAGE> (II) <IMAGE>t having suppressed photon number fluctuation is employed as a reproducing beam at need. If improvement of the number of reproducible times is in preference to improvement of the S-N ratio, such squeezed light having suppressed photon number fluctuation is employed as a reproducing beam with power which is set within a range of Prep (W) appearing in the following expression (III): <IMAGE> (III)