Continuous quantum light from a dark atom

Deterministic atom-light quantum interface

The notion of an atom-light quantum interface has been developed in the past decade, to a large extent due to demands within the new field of quantum information processing and communication. A promising type of such interface using large atomic ensembles has emerged in the past several years. In this article we review this area of research with a special emphasis on deterministic high fidelity...

Quantum Zeno Effect and Light-Dark Periods for a Single Atom

The quantum Zeno effect (QZE) predicts a slow-down of the time development of a system under rapidly repeated ideal measurements, and experimentally this was tested for an ensemble of atoms using short laser pulses for non-selective state measurements. Here we consider such pulses for selective measurements on a single system. Each probe pulse will cause a burst of fluorescence or no fluorescen...

Quantum Manipulation Using Light-Atom Interaction

A two-level quantum system in vacuum—in the absence of any perturbing fields—constitutes an ideal clock whose oscillation frequency ω = E/h is given by the energy difference E between the two levels |1〉, |2〉. In a single measurement of duration T performed on a single particle this frequency can be determined with an uncertainty Δω = 1/T. If the measurement is performed simultaneously on N inde...

Morphology of retinal photoreceptor layer in continuous light-exposed and dark-adapted male cats

The morphology of retinal photoreceptor layer was studied in continuous light-exposed and dark-adapteddomestic male cats (Felis catus). The eyes of 12 healthy adult cats (4 in continuous light-exposed group, 4 in continuous dark-adapted group, and 4 in control group) were routinely fixed and studied by electron microscope. Results showed that the general structure of photoreceptor layer in this...

Bright Light from Dark Matter