Abstract
Quantum beat phenomena is a very good example of a quantum interference. Quantum beats are observed, for example, in:
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i)
the fluorescence from atoms whose electrons are excited, impulsively, into a coherent superposition Ψ(re, 0) of excited states Φ1(r e ) and Φ2(r e), having slightly different energies [1, 2, 3]. After the excitation, the atom starts emitting light by spontaneous emission and decays back to the ground state Φ g (r e ). The intensity of the emitted light, detected by a photo multiplier, oscillates in time with frequency proportional to the energy difference of the two coherently superposed levels [1].
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ii)
the double resonance interferometric neutron experiment, suggested by Vigier and coworkers [4, 5] and performed by Badurek, Rauch and Tuppinger (BRT) [6]. The number of neutrons in the two detectors behind the interferometer show real time-beat effect. The observed beating period corresponds to an energy difference of the interfering beams.
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Božić, M. (1997). Compatible Statistical Interpretation of Quantum Beats. In: Jeffers, S., Roy, S., Vigier, JP., Hunter, G. (eds) The Present Status of the Quantum Theory of Light. Fundamental Theories of Physics, vol 80. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-5682-0_21
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