In the attempt to derive the regression theorem from the fluctuation
dissipation theorem several authors claim the violation of the former theorem
in the quantum case. Here we pose the question: does it exists a quantum
fluctuation dissipation theorem (QFDT) in its conventional interpretation? It
is shown that the relation usually called as the QFDT is the condition of
detailed macroscopic energetic balance. Following this interpretation the
existing conflict between the two theorems in the quantum case is removed.Comment: 13 pages, 3rd Int. Conf. on Unsolved Problems on Noise (will be
published in Proceedings
