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Acta Optica Sinica

Effects of Vacuum-Induced Coherence on the Single and Two-Photon Transparency in a Four-Level Ladder Atomic System

曾志强 Zeng Zhiqiang, 侯邦品 Hou Bangpin

Published Jan 1, 2010• 5 citations
Publisher
DOI
10.3788/aos20103001.0251

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When a four-level Y\mathsf{Y}Y-type atom with two highest nearly degenerate lying levels interacts with the same vacuum radiation field, its excited levels have vacuum-induced coherence due to the quantum interference between the spontaneous decay channels. We consider the effects of the vacuum-induced coherence on the electromagnetically induced transparency against single- and two-photon absorption in the atomic system. We find that the vacuum-induced coherence can lead to probe gain without incoherent pumping. On the other hand, the coherence can suppress the two-photon transparency, even in some cases where it can enhance the two-photon absorption. Another important result is the finding of the crucial role played by the relative phase between the probe and coupling fields: the two-photon transparency and the probe gain spectra can be modulated by this phase.
When the transitions connected by two nearly degenerate ground levels with an intermediate level in a four-level inverted Y-type atom interact with the same vacuum radiation field,which will lead to the quantum interference and create the vacuum-induced coherence.We find that the vacuuminduced coherence can suppress the single-and two-photon transparency at resonance and lead to single-photon probe gain at other frequency.Meanwhile,it is shown that the single-and two-photon absorption spectra can be drastically modulated by the relative phase between the probe and coupling fields.