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Article
Open AccessFrequency pushing enhanced by an exceptional point in an atom–cavity coupled system
We observed the frequency pushing of the cavity resonance as a result of the coupling of the cavity field with the ground state 138Ba in a high-Q cavity. A weak probe laser propagated along the axis of a Fabry–Pé...
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Article
A photonic quantum engine driven by superradiance
Performance of nano- and microscale heat engines can be improved with the help of quantum-mechanical phenomena. Recently, heat reservoirs with quantum coherence have been proposed to enhance engine performance...
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Article
Open AccessObservation of a half-illuminated mode in an open Penrose cavity
The illumination problem in mathematics questions the existence of a bounded region in which light rays from a point light source do not illuminate the whole region. Since Penrose disproved the illumination pr...
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Article
Open AccessHyperradiance by a stream of phase-correlated atomic dipole pairs traversing a high-Q cavity
Hyperradiance in which radiation rate exceeds that of superradiance has been theoretically investigated in various coherently-coupled emitter-field systems. In most cases, either proposed setups were experimen...
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Article
Realization of superabsorption by time reversal of superradiance
Emission and absorption of light lie at the heart of light–matter interaction1. Although emission and absorption rates are regarded as intrinsic properties of atoms and molecules, various ways to modify these rat...
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Article
Open AccessPractical lineshape of a laser operating near an exceptional point
We present a practical laser linewidth broadening phenomenon in the viewpoint of high sensitivity of an exceptional point (EP). A stochastic simulation model is implemented to describe the fluctuations in the ...
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Article
Open AccessMaximal Shannon entropy in the vicinity of an exceptional point in an open microcavity
The Shannon entropy as a measure of information contents is investigated around an exceptional point (EP) in an open elliptical microcavity as a non-Hermitian system. The Shannon entropy is maximized near the ...
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Article
Open AccessObservation of scalable sub-Poissonian-field lasing in a microlaser
Sub-Poisson field with much reduced fluctuations in a cavity can boost quantum precision measurements via cavity-enhanced light-matter interactions. Strong coupling between an atom and a cavity mode has been u...
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Article
Open AccessObservation of a non-equilibrium steady state of cold atoms in a moving optical lattice
Non-equilibrium dynamics expands our understanding on physical processes based on the conventional equilibrium physics. In particular, non-equilibrium steady states with continuous flow among them have drawn m...
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Open AccessObservation of an exceptional point in a two-dimensional ultrasonic cavity of concentric circular shells
We report observation of an exceptional point in circular shell ultrasonic cavities in both theory and experiment. In our theoretical analysis we first observe two interacting mode groups, fluid- and solid-bas...
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Article
Open AccessExperimental Observation of Bohr’s Nonlinear Fluidic Surface Oscillation
Niels Bohr in the early stage of his career developed a nonlinear theory of fluidic surface oscillation in order to study surface tension of liquids. His theory includes the nonlinear interaction between multi...
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Article
Open AccessNonlinear resonance-assisted tunneling induced by microcavity deformation
Noncircular two-dimensional microcavities support directional output and strong confinement of light, making them suitable for various photonics applications. It is now of primary interest to control the inter...
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Article
Three-dimensional imaging of cavity vacuum with single atoms localized by a nanohole array
Zero-point electromagnetic fields were first introduced to explain the origin of atomic spontaneous emission. Vacuum fluctuations associated with the zero-point energy in cavities are now utilized in quantum d...
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Article
Cavity-mediated cooling of a single atom in the intermediate coupling regime
We report observation of cavity-mediated cooling of a single 85Rb atom in the intermediate coupling regime of cavity quantum electrodynamics. A weak blue-detuned probe laser and a strong far-red-detuned dipole-fo...
