Physicists have announced a breakthrough in quantum holography.
#Cognitive #Physics
Physicists
at the University of Glasgow have announced a breakthrough in quantum
holography, which allows you to create crisp and detailed images while
removing interference from unwanted light sources and other external
influences. The method is predicated on the quantum entanglement of
photon polarization, when the properties of particles are
interdependent, despite the space separating them. The article of
scientists was published within the journal Nature Physics. The
breakthrough research is summarized during a handout on Phys.org.
In
conventional holography, a picture of an object is most frequently
created employing a beam , which is split into two beams, called the
thing and reference beams. The object beam expands and illuminates the
topic , being reflected then hitting the plate . The reference beam
doesn't touch the thing , is reflected from the mirror and also falls on
the plate, interacting with the beam reflected from the thing and
creating an interference pattern. During exposure, the sunshine sources,
the thing and therefore the plate must remain stationary relative to
every other, otherwise the hologram are going to be damaged.
For
living objects and unstable materials, holography is feasible only using
an intense and short pulse of sunshine , which is dangerous and is
nearly always administered in laboratories with special equipment.
The
new method of quantum holography also uses two beams, but they never
interact with one another . A blue beam passes through the crystal,
splitting it into two beams of entangled photons. When
something changes the properties (direction of motion and polarization)
of a photon in one beam, it also affects the properties of a photon
entangled with it in another. As in classical holography,
one beam is employed to illuminate an object, thus changing the phases
of the sunshine waves within the beam.
The second beam enters the
spatial light modulator, which partially reduces the speed of photons
passing through it. As a result, the light waves acquire a different
phase relative to their entangled partners.
A hologram is obtained by measuring the correlation between entangled photon positions using separate megapixel digital cameras. A
high-quality image of an object is obtained by combining four holograms
obtained for four different phase shifts applied by the modulator.
In
the experiment, the phase image was obtained for several objects:
letters Guofeng on a liquid display, a bird's feather and a drop of oil on a
slide . Scientists note that quantum holography is freed
from the shortcomings of classical holography, which makes it possible
to make detailed images useful for medical purposes, for instance ,
visualizing the functions of individual cells.
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