By Franck Laloë

Quantum mechanics is a truly profitable thought that has impacted on many parts of physics, from natural conception to functions. in spite of the fact that, it truly is tough to interpret, and philosophical contradictions and counterintuitive effects are obvious at a basic point. during this booklet, Laloë provides our present realizing of the idea. The e-book explores the fundamental questions and problems that come up with the idea of quantum mechanics. It examines many of the interpretations which have been proposed, describing and evaluating them and discussing their luck and problems. The ebook is perfect for researchers in physics and arithmetic who need to know extra in regards to the difficulties confronted in quantum mechanics yet who don't have expert wisdom within the topic. it's going to additionally curiosity philosophers of technology, in addition to all scientists who're keen on quantum physics and its peculiarities.

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**Additional resources for Do We Really Understand Quantum Mechanics?**

**Example text**

For this purpose, the “principle of correspondence” should be used [67]: “The correspondence principle expresses the tendency to utilize in the systematic development of the quantum theory every feature of the classical theories in rational transcription appropriate to the fundamental contrast between the postulates and the classical theories”. It is therefore natural that, on many occasions, he emphasized the importance of classical concepts to give 16 With, of course, the usual proviso: short quotations taken out of their context may, sometimes, give a superficial view on the position of their authors.

We compel it to assume a definite position; previously it was neither here nor there, it had not yet made its decision for a definite position . ”. (v) Landau and Lifshitz, in the first section of their book on quantum mechanics [72]: “The possibility of a quantitative description of the motion of an electron requires the presence also of physical objects which obey classical mechanics to a sufficient degree of accuracy. If an electron interacts with such a ‘classical object’ the state of the latter is, generally speaking, altered .

Schrödinger considers this as an obvious impossibility (a quite ridiculous case), and concludes, therefore, that something must have happened to stop the Von Neumann chain before it went too far. Again, the challenge is to explain macroscopic uniqueness: why, at a macroscopic level, a unique result (alive, or dead, cat) emerges, while this does not happen within the linear Schrödinger equation. The cat is of course a symbol of any macroscopic object – Einstein, in a letter to Schrödinger the same year [53], used the image of the macroscopic explosion of a barrel of powder4 .

### Do We Really Understand Quantum Mechanics? by Franck Laloë

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