Entropy squeezing of a moving atom and control of noise of the quantum mechanical channel via the two-photon process

Based on the quantum information theory, we have investigated theentropy squeezing of a moving two-level atom interacting with thecoherent field via the quantum mechanical channel of the two-photonprocess. The results are compared with those of atomic squeezingbased on the Heisenberg uncertainty relation. The influences of theatomic motion and field-mode structure parameter on the atomicentropy squeezing and on the control of noise of the quantummechanical channel via the two-photon process are examined. Ourresults show that the squeezed period, duration of optimal entropysqueezing of a two-level atom and the noise of the quantum mechanicalchannel can be controlled by appropriately choosing the atomic motionand the field-mode structure parameter, respectively. The quantummechanical channel of two-photon process is an ideal channel forquantum information (atomic quantum state) transmission. Quantuminformation entropy is a remarkably accurate measure of the atomicsqueezing.