Abstract
This chapter describes certain fundamental differences between classical and quantum mechanics, their different postulates, the role of the observer, what is meant by local and non-local interactions, causality and determinism , and the role of force, energy, and momentum. A short introduction to the purely quantum mechanical aspect of superposition, measurement, and entanglement is provided to mentally prepare the reader for the chapters ahead.
Most of the fundamental ideas of science are essentially simple, and may, as a rule, be expressed in a language comprehensible to everyone.
—Albert Einstein (Einstein and Infeld [28], p. 17.)
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Notes
- 1.
Deutsch [21].
- 2.
Hence, in our context, quantum computing is not about computational quantum physics, or quantum chemistry or modeling of quantum systems using classical computers.
- 3.
The terms “classical mechanics” and “classical physics” refer to a non-quantum theory. It is possible to give separately, for classical and quantum theories, a relativistic and a non-relativistic formulation.
- 4.
Maxwell [47].
- 5.
Dyson [26].
- 6.
Bohr [7].
- 7.
See Wheeler [68].
- 8.
Faye [33].
- 9.
- 10.
Thomson [65] for this discovery J. J. Thomson received the 1906 Nobel Prize in physics. His son George Paget Thomson won the 1937 Nobel Prize in physics (shared with Clinton Davisson) for showing that a beam of electrons could also be diffracted and hence behave as waves too.
- 11.
Planck [52]. In this paper, Planck provided a phenomenological fit to the blackbody radiation spectrum and introduced the constant h later named after him.
- 12.
Notwithstanding, the Nobel Prize in Physics 1918 was awarded to Max Karl Ernst Ludwig Planck “in recognition of the services he rendered to the advancement of Physics by his discovery of energy quanta.”
- 13.
Einstein [27]. This paper was fundamental to the development of quantum theory.
- 14.
This was in his doctoral thesis (titled Recherches sur la théorie des quanta (Researches on the Quantum Theory) at the Sorbonne in Paris.
- 15.
A. Einstein, Letter to P. Langevin, December 16, 1924. The quote appears in James [43], p. 311.
- 16.
- 17.
- 18.
In 1929, de Broglie was awarded the Nobel Prize in Physics “for his discovery of the wave nature of electrons.” In 1937, Sir George Paget Thomson and Clinton Joseph Davisson shared the Nobel Prize for physics “for their experimental discovery of the diffraction of electrons by crystals.”
- 19.
In passing we note that the concept of force may be considered redundant. In principle, one can always express classical physics in terms of the positions, velocities, and accelerations of all the particles of the universe.
- 20.
We now know from chaos theory that there are limitations to this; it appears in the form of “deterministic chaos.” It was first noticed in 1890 by Henri Poincaré (1854–1912). See Poincaré [53].
- 21.
See, e.g., Bohm [4], Chap. 2.
- 22.
Renkel [55].
- 23.
Born won the 1954 Nobel Prize in physics “for his fundamental research in quantum mechanics, especially for his statistical interpretation of the wavefunction.” It was shared with Walther Bothe, who won it “for the coincidence method and his discoveries made therewith.” Born’s Nobel lecture, 11 December 1954 (see Born [11]) is highly recommended to the reader.
- 24.
It may well be that Nature, at its core, is completely deterministic and the dynamics of the Universe is preordained.
- 25.
- 26.
Given a set S and two binary operators * and + on S, we say that the operation * is left-distributive over + if, given any elements x, y, and z of S, x * (y + z) = (x * y) + (x * z) and right-distributive if (y + z) * x = (y * x) + (z * x), and simply distributive if both left and right hold. Note that when * is commutative, then all the three are logically equivalent.
- 27.
Susskind and Friedman [64], pp. 35, 94.
- 28.
Susskind and Friedman [64], p. 96.
- 29.
- 30.
Nobelprize [51].
- 31.
Heisenberg [40], p. 57.
- 32.
Heisenberg [40], p. 75.
- 33.
- 34.
- 35.
Schrödinger [57].
- 36.
Born [11].
- 37.
Dirac [24].
- 38.
Hawking [36].
- 39.
Since Schrödinger’s wave equation is non-relativistic, it does not work at high energies. At high energies, particle physicists use the S Matrix (also called scattering matrix), an array of mathematical quantities that predicts the probabilities of all possible outcomes of a given experimental situation. E.g., two colliding particles may alter in speed and direction or even change into entirely new particles: The S-matrix for the collision gives the likelihood of each possibility. An S-matrix is expressed in terms of observable quantities. Complete knowledge of the S-matrix for all processes would amount to having complete understanding of all physical laws.
- 40.
For example, de Broglie and Schrödinger had attempted to make the obvious analogy between matter waves of quantum mechanics and classical waves of Maxwellian electrodynamics without success, because such an analogy, inter alia, was incompatible with the intrinsic nonlocality of quantum phenomena.
- 41.
Invented by Paul Dirac.
- 42.
- 43.
A linear operator U whose inverse is its adjoint (conjugate transpose) is called unitary.
- 44.
Born [12], p. 95.
- 45.
Born [12], p. 96.
- 46.
Born [12], p. 102.
- 47.
- 48.
- 49.
- 50.
- 51.
See, e.g., Lamb [45].
- 52.
Susskind and Friedman [64], p. 52.
- 53.
For a proof, see, e.g., Dirac [25], pp. 49–50. The converse is also true, i.e., if there are two observables such that their simultaneous eigenstates form a complete set, then the two observables commute.
- 54.
In Chap. 2, Sect. 2.2, we noted the two-layer description of the world . In quantum mechanics, one may view observable-operators as partly doing the task of the second layer. What is unusual here is that an observable-operator initiates the random “collapse” of the wave function on which it acts.
- 55.
Bohm [4], pp. 84–85.
- 56.
- 57.
Born [11].
- 58.
Stapp [63].
- 59.
- 60.
Deutsch [23].
- 61.
- 62.
- 63.
Seife [62].
- 64.
Al-Kahlili [1], p. 153.
- 65.
See Footnote 64.
- 66.
Mermin [48].
- 67.
Everett [29].
- 68.
Everett [30].
- 69.
Byrne [16].
- 70.
Al-Kahlili [1].
- 71.
See Footnote 70.
- 72.
Byrne [16].
- 73.
Everett [31].
- 74.
Deutsch [22], p. 51.
- 75.
- 76.
- 77.
Galileo is the only scientist referred to in the scientific literature by his first name rather than his last.
- 78.
Popper [54]. Great scientific theories have built into them the risk of making predictions of possible effects not yet observed. The matter wave theory of de Broglie is one of them. A theory which is not refutable by any conceivable event is non-scientific. Irrefutability is not a virtue of a theory (as people often think) but a vice. As for Popper, “the criterion of the scientific status of a theory is its falsifiability, or refutability, or testability.” Theories which fail to meet the criterion of falsifiability adopt the soothsayer’s practice of making their interpretations and prophesies sufficiently vague so that they are able to explain away anything that might have been a refutation of the theory had the theory and prophesies been more precise.
- 79.
Heisenberg [40], p. 58.
- 80.
Zukav [70], p. 129.
- 81.
Bohr [8], p. 60.
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Bera, R.K. (2020). Distinguishing Features and Axioms of Quantum Mechanics. In: The Amazing World of Quantum Computing. Undergraduate Lecture Notes in Physics. Springer, Singapore. https://doi.org/10.1007/978-981-15-2471-4_2
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