Squeezed states of light
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In quantum physics, light is in a squeezed state if its electric field strength Ԑ for some phases ϑ has a quantum uncertainty smaller than that of a coherent state. The term squeezing thus refers to a
Fig. 1: Electric field of a monochromatic light-wave versus phase, for five different quantum states. The fuzzy area illustrates the fact that the electric field strength is not precisely defined. The darker the color the higher the probability.
Fig. 3: Schematic of a laser interferometer for the detection of gravitational waves. Here, squeezed vacuum states are injected and overlapped with the bright field at the central beam splitter to improve the sensitivity.
Fig. 4: Photo voltages of a photo diode detecting light.
Fig. 5: Measurement results on two EPR entangled light fields. The measurement values taken on one subsystem (at A) and on the other subsystem (at B) vary a lot, i.e. show a large local uncertainty. Comparing the data as shown here reveals correlations (top, blue) or anti-correlations (bottom, blue). In this example, correlations as well as anti-correlations are stronger than the vacuum state uncertainty (black).
Carlton M. Caves
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Carlton Morris Caves is an American theoretical physicist. He is currently professor emeritus and research professor of physics and astronomy at the University of New Mexico. Caves works in the areas
Caves in October 2020
Carlton M. Caves on the north side of Bridge Laboratory at Caltech, late 1970s,