From the Henryk Niewodniczanski Institute of Nuclear Physics of the Polish Academy of Sciences

The world of quantum phenomena is full of paradoxes incomprehensible to human intuition and inexplicable to classical physics. This is the thesis we almost always hear when it comes to quantum mechanics. Here are some examples of phenomena that are commonly considered to be typically quantum: a single electron generating interference fringes behind two slits, as if it were passing through both at the same time; particles that are in different states at the same time, only to appear “magically” in one selected state at the moment of observation; measurements without interactions; erasing the past by means of a quantum eraser; or finally, nonlocality, which gives the impression that entangled particles are immediately interacting over any long distance. But do all these phenomena necessarily have to be purely quantum?

In an article that has just been published, Dr. Pawel Blasiak from the Institute of Nuclear Physics of the Polish Academy of Sciences (IFJ PAN) in Cracow showed how to construct, from the building blocks of classical physics, broadly understood optical interferometric systems, faithfully reproducing the strangest predictions of quantum for single particles. The presented model helps us to understand better why quantum mechanics is needed and what it really tells us about our surrounding reality that is new. If a quantum effect has a simple classical explanation, one should not go looking for any particular secret in it. The publication clearly indicates the boundary beyond which quantum theory becomes essential: true quantum “magic” only starts with multiple particles.

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So, Feynman or Schrödinger? Schrödinger seems to have got to the very heart of quantum mechanics. But the silent winner could be… Albert Einstein, who was never satisfied with the commonly accepted interpretation of quantum mechanics. Without his stubborn questions we would have neither Bell’s theorem nor the field of quantum information today.”Where is it, the foundation of quantum reality?” at

Eurekalert

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*See also:* The cat is back: Is quantum theory, dead, alive, or contradicting itself