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Quantum Foam a place to travel from on the Internet
The size of the Planck length can be visualized as follows: if a particle or dot
about 0.1mm in size (which is at or near the smallest the unaided human eye can see) were
magnified in size to be as large as the observable universe, then inside that universe-sized
"dot", the Planck length would be roughly the size of an actual 0.1mm dot. In other words,
the diameter of the observable universe is to within less than an order of magnitude, larger
than a 0.1 millimeter object, roughly at or near the limits of the unaided human eye, by
about the same factor (1031) as that 0.1mm object or dot is larger than the Planck length.
More simply – on a logarithmic scale, a dot is halfway between the Planck length and the
size of the observable universe.
At this miniscule scale, it is theorized that tiny particles or black holes are
fluctuating -- appearing and disappearing. This churning mix of particles is called quantum
foam. To visualize it, imagine a swimming pool full of boiling water. Up close, you can see
frothing and bubbles bursting, but if you viewed a satellite photo of the pool, the surface
would appear unbroken.
The Planck scale is the limit below which the very notions of space and length
cease to exist. Any attempt to investigate the possible existence of shorter distances (less
than 1.6 ×10−35 m), by performing higher-energy collisions, would inevitably result in
black hole production. Higher-energy collisions, rather than splitting matter into finer
pieces,
would
simply
produce
bigger
black
holes.
The Casimir effect can also be understood in terms of the behavior of virtual particles in the
empty space between two parallel plates. Ordinarily, quantum field theory does not deal with virtual
particles of sufficient energy to curve spacetime significantly, so quantum foam is a speculative extension
of these concepts which imagines the consequences of such high-energy virtual particles at very short
distances and times.
QCD in Perspective from mdipierro on Vimeo.
The video shows a blend of scientific visualization and artistic rendering to explain the scale
and purpose of lattice QCD computations. We zoom from an human eye to the molecular scale, to the
atomic scale and the subatomic scale (down to a billionth of a billionth of a meter). In the last sequences
we reproduce the actual wave function for a Pion (bound quark-antiquark state) in presence of statistical
noise, as computed from lattice QCD, superimposed to quantum fluctuations of the topological change
density in the vacuum (also from actual lattice QCD computations). All frames are computed from actual
data, including DNA unwinding and the Adenine molecular structure.

A great place to start is New Scientist magazine’s guide to the Quantum World:

CQT has its own quantum briefing room:

Here’s “Quantum Computing 101″ from the Institute for Quantum Computing in Waterloo, Canada:

CQT’s director, Artur Ekert, on quantum cryptography

A poster on what quantum computing is all about:

Science writer John Gribbin offers his take on some quantum mysteries:

New York Times writer John Markoff discusses the emergence of quantum computing:

Vlatko Vedral asks if we can find those pesky parallel universes:

Another general look at the theory

A lovely introduction to the spooky phenomenon that is quantum entanglement:

© 2015 Flicker Light^{tm} Studio All Rights Reserved

Quantum Foam a place to travel from on the Internet
The size of the Planck length can be visualized
as follows: if a particle or dot about 0.1mm in size (which is
at or near the smallest the unaided human eye can see) were
magnified in size to be as large as the observable universe,
then inside that universe-sized "dot", the Planck length
would be roughly the size of an actual 0.1mm dot. In other
words, the diameter of the observable universe is to within
less than an order of magnitude, larger than a 0.1 millimeter
object, roughly at or near the limits of the unaided human
eye, by about the same factor (1031) as that 0.1mm object or
dot is larger than the Planck length. More simply – on
a logarithmic scale, a dot is halfway between the Planck
length and the size of the observable universe.
At this miniscule scale, it is theorized that tiny
particles or black holes are fluctuating -- appearing and
disappearing. This churning mix of particles is called
quantum foam. To visualize it, imagine a swimming pool
full of boiling water. Up close, you can see frothing and
bubbles bursting, but if you viewed a satellite photo of the
pool, the surface would appear unbroken.
The Planck scale is the limit below which the
very notions of space and length cease to exist. Any attempt
to investigate the possible existence of shorter distances
(less than 1.6 ×10−35 m), by performing higher-energy
collisions, would inevitably result in black hole production.
Higher-energy collisions, rather than splitting matter into
finer pieces, would simply produce bigger black holes.
The Casimir effect can also be understood in
terms of the behavior of virtual particles in the empty space
between two parallel plates. Ordinarily, quantum field
theory does not deal with virtual particles of sufficient
energy to curve spacetime significantly, so quantum foam is
a speculative extension of these concepts which imagines
the consequences of such high-energy virtual particles at
very short distances and times.
QCD in Perspective from mdipierro on Vimeo.
The video shows a blend of scientific
visualization and artistic rendering to explain the scale and
purpose of lattice QCD computations. We zoom from an
human eye to the molecular scale, to the atomic scale and
the subatomic scale (down to a billionth of a billionth of a
meter). In the last sequences we reproduce the actual wave
function for a Pion (bound quark-antiquark state) in
presence of statistical noise, as computed from lattice QCD,
superimposed to quantum fluctuations of the topological
change density in the vacuum (also from actual lattice QCD
computations). All frames are computed from actual data,
including DNA unwinding and the Adenine molecular
structure.