TAILIEUCHUNG - Basic Theoretical Physics: A Concise Overview P29

Basic Theoretical Physics: A Concise Overview P29. This concise treatment embraces, in four parts, all the main aspects of theoretical physics (I . Mechanics and Basic Relativity, II. Electrodynamics and Aspects of Optics, III. Non-relativistic Quantum Mechanics, IV. Thermodynamics and Statistical Physics). It summarizes the material that every graduate student, physicist working in industry, or physics teacher should master during his or her degree course. It thus serves both as an excellent revision and preparation tool, and as a convenient reference source, covering the whole of theoretical physics. It may also be successfully employed to deepen its readers’ insight and. | 288 36 On the Interpretation of Quantum Mechanics Austria see . the paper in the journal Spektrum der Wissenschaften 1997 issue 1 which has already been mentioned 32 . Starting with a laser beam propagating in the x-direction the photons of this beam are linearly polarized in the vertical z -direction polarization Po 0 a beam splitter then follows which produces two coherent beams propagating . in the x-direction and the y-direction respectively . along two different paths W1 and W2 with complementary diagonal polarizations P1 45 and P2 135 . Thirdly the two beams meet again at a crossing point X where by interference the original polarization Po 0 is restored. Next a detector follows which is inserted at the continuation of the path W1 but counts per construction only photons of polarization PD 90 . As a consequence this detector will never count any photon of the beam since all photons leaving X have the orthogonal polarization Po 0 . Thus with such a detector one cannot state which way a photon emitted by the source reached the crossing point. Only when the interference is blocked . by interrupting the path W2 will the detector start counting photons a photon emitted by the source reaches the point with probability via the non-blocked path . with polarization P1 45 and is counted by the detector Pd 90 again with probability 21. In this way . if the detector records a count one not only has a statement about i which path the electron traveled along Wi but also one knows ii that the alternative path W2 is blocked possibly by a container carrying a bomb cf. the section on Schrodinger s cat . Morever this fact . the possible presence of a bomb in path W2 has been established here via an interaction-free quantum measurement . without making the bomb explode. Such experiments and many similar ones on the non-locality of quantum mechanics of course without involving any bomb have been realized by Zeilinger et . It is obvious that this has .

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