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Investigating Reasons for Decrease in the Popularity of Wave Reduction by
Decoherence

Sharifian, Alireza | 2016

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 48291 (04)
  4. University: Sharif University of Technology
  5. Department: Physics
  6. Advisor(s): Golshani, Mehdi
  7. Abstract:
  8. Decoherence is one of the candidates for solving the measurement problem, and is among the group of theories which are trying to solve the measurement problem within the quantum theory, by removing the wave function reduction axiom. The main idea is to consider the environment of the system which was ignored in the classical physics. The openness of a quantum systems makes the system and its environment entangled, and that leads to the transmission of system information to the environment, and finally, the system loses its individuality. This approach claims that since the observer can’t control and consider all the degrees of freedom of the environment and has only access to the system, after a certain time (which depends on entanglement rate with environment and called decoherence time), the observer obtains a classical ensemble. This means that the systems is seen in a certain state, but due to our ignorance about the entangled state, we interpret the result probabilistically .This idea was suggested by H. D. Zeh in 1970. Some people claimed that the decoherence approach solved the measurement problem, but gradually, even the originators of this approach have changed their minds, and now many physicists believe that decoherence per se can’t solve the measurement problem and it should be applied along with other interpretations, especially Everrett-like interpretation. In this thesis, we try to review this approach, and, then, present some of the remaining problems and dissatisfactions with this approach
  9. Keywords:
  10. Decoherence ; Wave Function Reduction ; Measurement Problem ; Superselection Rule

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