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Quantum Dynamics, The Master Equation and Detailed Balance 14.
Quantum Dynamics, The Master Equation and Detailed Balance 14.

Ohio_06
Ohio_06

Adiabatic.Quantum.Slow.Altshuler
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... (c) After going to an excited state, an atom emits a photon and comes back to the ground state. Suppose there is an uncertainly of about one nanosecond as to when precisely the atom emits the photon. What is the uncertainty in the energy of the emitted photons? (d) A pulse laser emits out pulses of ...
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... The same procedure can be used to obtain expectation value of any quantity : Potential energy V(x) which is a function of x. The expectation value for ‘p’ can not be calculated this way. According to uncertainty principle: Page 3 ...
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Perturbation theory (quantum mechanics)

In quantum mechanics, perturbation theory is a set of approximation schemes directly related to mathematical perturbation for describing a complicated quantum system in terms of a simpler one. The idea is to start with a simple system for which a mathematical solution is known, and add an additional ""perturbing"" Hamiltonian representing a weak disturbance to the system. If the disturbance is not too large, the various physical quantities associated with the perturbed system (e.g. its energy levels and eigenstates) can be expressed as ""corrections"" to those of the simple system. These corrections, being small compared to the size of the quantities themselves, can be calculated using approximate methods such as asymptotic series. The complicated system can therefore be studied based on knowledge of the simpler one.
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