@article{BUZEK,
author = {BUZEK, V and KIM, M},
journal = {JOURNAL OF THE KOREAN PHYSICAL SOCIETY},
pages = {(215--220)--(215--220)},
title = {DECAY WITHOUT LOSSES - MEAN-PHOTON-NUMBER DECAY AND SHANNON ENTROPY DECAY OF MICROMASER FIELDS VIA CONDITIONAL MEASUREMENTS},
volume = {27},
}

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TY  - JOUR
AB  - We investigate the dynamics of a lossless micromaser when a single-mode cavity field is resonantly coupled via one-photon transitions to two-level atoms crossing the cavity in a sequence. We analyze the statistical properties of the cavity field when the atoms after the interaction are conditionally measured, provided the interaction time is short. Namely, we select only those sequences wherein each atom after the interaction is measured in its initial state. We assume that the total sequence duration is smaller than the cavity decay time so that cavity losses can be neglected. We show that even though there is no direct transfer of the energy from the atoms to the field and vice versa, the mean photon number of the cavity field is reduced due to the conditional measurement. This energy ‘’decay” is accompanied by a reduction of the Shannon entropy of the field. We show that there exists an attractor state of the cavity field which is the Fock state with the smallest photon number which contributes to the initial state of the field. Finally, we find the remarkable result that the time evolution of a field initially prepared in a coherent state which is conditionally measured by the sequence of atoms is exactly the same as the time evolution of a coherent field decaying into a zero-temperature heat bath.
AU  - BUZEK,V
AU  - KIM,M
EP  - 220
SN  - 0374-4884
SP  - 215
TI  - DECAY WITHOUT LOSSES - MEAN-PHOTON-NUMBER DECAY AND SHANNON ENTROPY DECAY OF MICROMASER FIELDS VIA CONDITIONAL MEASUREMENTS
T2  - JOURNAL OF THE KOREAN PHYSICAL SOCIETY
VL  - 27
ER  - 

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