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Masked states of an atom coupled to a standing-wave cavity mode
摘要： The form of the eigenstates of an atom coupled to a cavity mode displaying a three-dimensional periodic profile are obtained. It is shown that the quantized motion leads to degenerate states where the atomic degrees of freedom are masked, that is, upon detection of one component of this composite system the others remain in an entangled state. When the system is extended to include drive and dissipation it is found to undergo a dissipative quantum phase transition at a critical drive amplitude. Unlike other phase transitions reported in the literature, the degeneracy prepares the system in a superposition of incompatible states upon detection of the electromagnetic field. Probing the field hints at an order above the transition point that, due to state masking, allows for atomic coherence to survive at long times.
关键词： atom-cavity coupling,atomic coherence,entangled state,dissipative quantum phase transition,state masking,degenerate states,quantized motion
更新于2025-09-23 15:19:57
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Saturable Absorption in Solution-Phase and Cavity-Coupled Tungsten Hexacarbonyl
摘要： Saturable absorption, in which optical absorption decreases as the incident intensity increases, is commonly utilized in the visible and near-infrared for laser applications. In the mid-infrared, most vibrational transitions are too weak and optical fluences too low to achieve saturable absorption. In this work, we demonstrate saturable absorption in a narrow band centered at 1983 cm?1 in solution-phase W(CO)6 with a readily accessible saturation fluence. Furthermore, in a system where coupling between the strongly absorbing vibrational mode of W(CO)6 and an optical cavity gives rise to two polariton modes (i.e., the strong coupling regime), we demonstrate that saturation of the splitting between polariton peaks leads to a fluence-dependent cavity transmission with a saturation fluence that scales counterintuitively with the cavity length and molecular concentration.
关键词： infrared modulation,saturable absorption,cavity coupling,vibrational strong coupling
更新于2025-09-19 17:13:59