



Quantum cats are hard to see
December 19, 2011
International team of researchers explain the difficulty of detecting quantum effects Are there parallel universes? And how will we know? This is one of many fascinations people hold about quantum physics. Researchers from the universities of Calgary and Waterloo in Canada and the University of Geneva in Switzerland have published a paper this week in Physical Review Letters explaining why we don't usually see the physical effects of quantum mechanics. "Quantum physics works fantastically well on small scales but when it comes to larger scales, it is nearly impossible to count photons very well. We have demonstrated that this makes it hard to see these effects in our daily life," says Dr. Christoph Simon, who teaches in the Department of Physics and Astronomy at the University of Calgary and is one of the lead authors of the paper entitled: Coarsegraining makes it hard to see micromacro entanglement. It's well known that quantum systems are fragile. When a photon interacts with its environment, even just a tiny bit, the superposition is destroyed. Superposition is a fundamental principle of quantum physics that says that systems can exist in all their possible states simultaneously. But when measured, only the result of one of the states is given. This effect is known as decoherence, and it has been studied intensively over the last few decades. The idea of decoherence as a thought experiment was raised by Erwin Schrödinger, one of the founding fathers of quantum physics, in his famous cat paradox: a cat in a box can be both dead and alive at the same time. But, according to the authors of this study, it turns out that decoherence is not the only reason why quantum effects are hard to see. Seeing quantum effects requires extremely precise measurements. Simon and his team studied a concrete example for such a "cat" by using a particular quantum state involving a large number of photons. "We show that in order to see the quantum nature of this state, one has to be able to count the number of photons in it perfectly," says Simon. "This becomes more and more difficult as the total number of photons is increased. Distinguishing one photon from two photons is within reach of current technology, but distinguishing a million photons from a million plus one is not." University of Calgary

Quantum Physics: A Beginner's Guide (Beginner's Guides)
by Alastair Rae (Author)
As Alastair Rae points out in his introduction, "quantum physics is not rocket science". It may have gained a reputation as the theory that no one really understands, but its practical applications are all around us in everyday life. If it were not for quantum physics, computers would not function, metals would not conduct electricity, and the power stations that heat our homes would not produce energy. Assuming no prior scientific or mathematical knowledge, this clear and concise introduction provides a stepbystep guide to quantum theory, right from the very basic principles to the most cuttingedge developments, such as superfast computers and unbreakable codes, which could soon become reality. Finally, Rae turns to the philosophical questions posed by quantum physics and asks: if...


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by Manjit Kumar (Author)
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by Amazon Kindle Direct Publishing
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Science enhances the moral values of life because it furthers a love of truth and reverence—love of truth displaying itself in the constant endeavor to arrive at a more exact knowledge of the world of mind and matter around us, and reverence, because every advance in knowledge brings us face to face with the mystery of our own being.  Max Planck
The most beautiful thing we can...


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by Greg Kuhn (Author)
Author Greg Kuhn is a professional educator and a futurist, specializing in framing new paradigms for 21st century living. Since 1993, he has written with his father, Clifford Kuhn, M.D., about health, wellness, and productivity. In Why Quantum Physicists Do Not Fail, Greg has unveiled all of his most cuttingedge research into the attainment of your goals and dreams through revolutionary new paradigms from the amazing science of quantum physics. Always entertaining, Greg reveals simple, easytouse techniques which you’ll not only master quickly, but also have fun using. Greg is also the author of the acclaimed book, Why Quantum Physicists Don’t Get Fat, which teaches you to finally lose your unwanted weight also using new paradigms from quantum physics.


Quantum Mechanics: The Theoretical Minimum
by Leonard Susskind (Author), Art Friedman (Author)
First he taught you classical mechanics. Now, physicist Leonard Susskind has teamed up with data engineer Art Friedman to present the theory and associated mathematics of the strange world of quantum mechanics.
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Understanding Quantum Physics: An Advanced Guide for the Perplexed
by Amazon Kindle Direct Publishing
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This book will convincingly show that the real meaning of the wave function can already be unveiled based on the established parts of quantum...


Quantum Physics For Dummies
by Steve Holzner (Author)
Quantum Physics For Dummies, Revised Edition helps make quantum physics understandable and accessible. From what quantum physics can do for the world to understanding hydrogen atoms, readers will get complete coverage of the subject, along with numerous examples to help them tackle the tough equations. Compatible with classroom text books and courses, Quantum Physics For Dummies, Revised Edition lets students study at their own paces and helps them prepare for graduate or professional exams. Coverage includes:The Schrodinger Equation and its ApplicationsThe Foundations of Quantum PhysicsVector NotationSpinScattering Theory, Angular Momentum, and moreYour plainEnglish guide to understanding and working with the micro worldQuantum physics — also called quantum mechanics or quantum field...


Introducing Quantum Theory: A Graphic Guide to Science's Most Puzzling Discovery
by J.P. McEvoy (Author), Oscar Zarate (Author)
Quantum theory is one of science's most thrilling, challenging and even mysterious areas. Scientists such as Planck, Einstein, Bohr, Heisenberg and Schrödinger uncovered bizarre paradoxes in the early 20th century that seemed to destroy the fundamental assumptions of 'classical physics'  the basic laws we are taught in school. Notoriously difficult, quantum theory is nonetheless an amazing and inspiring intellectual adventure, explained here with patience, wit and clarity.


The Quantum World: Quantum Physics for Everyone
by Kenneth W. Ford (Author), Diane Goldstein (Contributor)
As Kenneth W. Ford shows us in The Quantum World, the laws governing the very small and the very swift defy common sense and stretch our minds to the limit. Drawing on a deep familiarity with the discoveries of the twentieth century, Ford gives an appealing account of quantum physics that will help the serious reader make sense of a science that, for all its successes, remains mysterious. In order to make the book even more suitable for classroom use, the author, assisted by Diane Goldstein, has included a new section of Quantum Questions at the back of the book. A separate answer manual to these 300+ questions is available; visit The Quantum World website for ordering information. There is also a cloth edition of this book, which does not include the "Quantum Questions" included in...

