Qbism: The Future of Quantum Physics (英语) 精装 – 2016年10月4日
Hans Christian von Baeyer has done a wonderful job with this book. I've been fortunate enough to learn QBism twice in my life. The first time, it was the hard way, as colleagues and I battled out every nuance of the forming theory, always testing and retesting, tearing down and reconstructing--we had to turn our world upside down to get there. But the second time was pure pleasure as I learned the subject afresh from Professor von Baeyer's masterful articulation of it. So many of his turns of phrase are insightful gems I never could have formulated myself. Now for the first time I believe I know how to teach the subject, and there is no better understanding one can have than that!--Christopher A. Fuchs, Professor of Physics, University of Massachusetts Boston, and key architect of QBism Von Baeyer offers a sensible approach to this seemingly esoteric world...He has an enthusiastic presentation and style that sweeps the reader along into the world of quantum physics and makes sense of it.--Ralph Peterson"Manhattan Book Review" (03/01/2017) QBism should be applauded as a breeding ground of ideas for multiple disciplines including physics, philosophy, and mathematics, and von Baeyer's book offers an account accessible to all...[It] provide[s] an outstanding introduction to two of the key components of QBism (quantum theory and subjective Bayesianism), and places the reader into the mind of the QBist in a way that will aid the ongoing debate over its merit. It is a worthwhile read.--Kelvin J. McQueen"Quantum Times" (07/04/2017) Physicists all agree on how to do calculations using quantum mechanics and disagree markedly on what those calculations really mean. With his customary humor and elegance, Professor von Baeyer walks us through one of the more recent attempts to understand the mysterious world inside the atom.--James Trefil, Professor of Physics, George Mason University, and the author of Science in World History
Hans Christian von Baeyer is Chancellor Professor of Physics, Emeritus, at the College of William and Mary.
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There is currently no scientific basis for preferring one interpretation of QM (including QBism) over another. People who say one is right and another is wrong are just emoting. I will have none of it.
Of course, some interpretations may be preferred on metaphysical grounds, whatever that means. If there is a candidate for rejection on metaphysical grounds, QBism is it. The interpretation rests on the rejection of a frequency interpretation of probability in favor of a Bayesian (subjective) interpretation. In fact, there are several different notions of probability in the scientific literature, and both frequency and subjective models are valid under different conditions. But the frequency interpretation is perfectly valid for QM, and the subjective interpretation is simply outlandish. Can one really believe there was no spectrum to the hydrogen atom until someone saw such a spectrum? Do QM electron ic devices work because of human subjectivity? Or quantum computing? Outlandish is the subjective interpretation in these cases.
The book devotes a shoddy chapter to the critique of frequency models. It starts by observing that you can't tell if a roulette wheel is "fair" by observing one outcome (e.g., the ball lands on slot 11). It then says that 100 trials of flipping a coin can be represented by a roulette wheel with 2 to the power 100 slots. You can't tell if the wheel is fair by the outcome because all outcomes are equally likely. This is true. But suppose before I spin this wheel i assert that the probability that the outcome will have between 45 and 55 ones. This will be correct with very high probability. If the outcome has five ones, the wheel is unfair with probability close to one. This is the basis of all of statistical mechanics. The book's critique is simply wrong.
The book is well writien and fun to read, although quite unconvincing.