Describing the world exactly in all its details has always been the ambition
of physics. But quantum physics pushes the boundaries of this view
and opens a completely new perspective.
There is hardly anything that has preoccupied mankind as
much as light. Whether it is described in the Bible as the origin
of all life, or by the philosophers of antiquity as a symbol for
absolute knowledge, whether we describe certain historical
periods as “Dark Ages” or the age of reason as “Enlightenment“
– in the struggle for knowledge, faith and our place in the universe,
light has always been a welcome metaphor.
“Let there be light! And there was light.” –
Old Testament, The First Book of Moses
However, light only became a subject of investigation as the modern natural sciences, particularly physics, started rising and developing.
Up to the mid of the last century though, it was still relatively unclear what light actually was. Its accurate
exploration was only made possible by an understanding of science that had its origins in the
early stages of the Enlightenment: the reduction of observations to simple laws – a principle also used
by Isaac Newton in the formulation of classical mechanics.
“That I can see what holds the world together at its core.” –
Johann Wolfgang von Goethe
Classical mechanics had led to a world view which, from that point on, also changed
the understanding of culture, state, society or spiritual life. Humanity attained a
whole new self-confidence, detached from religious dogma and inspired by the spirit
of the Enlightenment. For if the world follows definite physical laws and humanity is
able to decipher them, it would not be long until all phenomena would eventually be fully
explained and predicted.
There lies a certain irony in the fact that light served as the
first source of evidence for undermining this world view at the
beginning of the 20th century, through the rise of quantum
physics. Suddenly, there were theories that, under certain conditions,
refuted the assumptions previously anchored in classical
mechanics and in the theory of relativity. The unambiguous
determinability was replaced by uncertainty and the exact calculation
was replaced by probability.
“God does not play dice with the universe” – Albert Einstein
Where the former principles promised to determine movement
curves of flying objects – such as a celestial body – precisely,
quantum theory limits itself to the prediction of curves
weighted with probabilities. An understanding that shocked
the physical world at the time. “God does not play dice with the universe“ is one of Albert Einstein‘s
most famous quotes, who himself made valuable contributions to quantum physics. Also the phrase
“spooky action at a distance“ that refers to the completely new phenomenon of entanglement belonged
to Einstein‘s view.
As many puzzles as quantum physics posed, its benefits are obvious: in everyday life it meets us in
most technical devices, in electronic semiconductor elements and that way in every microchip, in magnetic
resonance tomography, but also in lasers or light-emitting diodes. Quantum physics is therefore
one of the best experimentally tested theories in physics.
“Understanding often goes much further than reason” – Marie von Ebner-Eschenbach
However, that has not led yet to the questioning of the absolute, deterministic
conception of the world and the universe. Quantum physics is
over 100 years old now and it is very easy to find many good quotes by
its founders from the time of its beginnings. In this day and age however,
its understanding is limited to peripheral areas of physics and has
not yet really come to enter other sectors of society. For that to happen,
young people should come in touch with quantum physics and have
the chance to understand its phenomena using a learning-by-doing
approach. This is the “Enlightenment claim“ of the Quantenkoffer.