A New Holographic Entropy Bound from Conformal Field Theory at The Killing Horizon

A new holographic entropy bound is obtained by using conformal
field theory at Killing horizon. The entropy bound is tighter than the well-known bounds, such as Bekenstein, Bekenstein-Mayo and 't Hooft bounds. The result shows that the entropy of a system decreases when quantum effects are included. Therefore, the quantum effect will increase the degree of order of the system.