Download e-book for iPad: Solved problems from Peskin-Schroeder QFT, chapters 2 to 5 by Reid H.

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Extra info for Solved problems from Peskin-Schroeder QFT, chapters 2 to 5

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This is a challenging task, which must avoid the pitfalls of being either too sketchy on experimental details, giving the impression that one is again merely imagining a virtual experiment, or being too technical, thus burying the physics under engineering precision. We have chosen here the middle ground between these two dangers. In this way, we hope to convey the beauty and the amazement of the physics and to give, at the same time, an understanding of the difficulties which must be overcome to unveil the quantum, and hopefully to harness it for achieving information science goals.

We then analyse entanglement and non-locality, as it is revealed by Bell’s inequality experiments. We next show how decoherence contributes to explaining the quantum–classical boundary and to shed light on the important issue of measurement in quantum physics. The chapter ends by a review of quantum information, which introduces the principles of quantum cryptography, teleportation and quantum computing. Chapter 3 is a short self-consistent introduction to quantum optics, viewed as a story about field oscillators (or ‘springs’) coherently coupled with two-level atoms (‘spins’).

It emphasizes that a physical quantity has no reality unless it has been effectively measured, or at least unless it could be measured within the context of the experiment (we will come back to the definition of reality when we discuss non-locality). Complementarity insists also on the relativity of classical notions, such as the wave or corpuscular nature of a system. These notions acquire a meaning only in relation to a specific apparatus. It is when the set-up has been precisely defined that the particle in the interferometer ‘decides’ to behave as an interfering wave or as a particle with a well-defined trajectory.

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Solved problems from Peskin-Schroeder QFT, chapters 2 to 5 by Reid H.

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