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  1.  24
    Is Spin Coherence Like Humpty-Dumpty? I. Simplified Treatment.Berthold-Georg Englert, Julian Schwinger & Marlan O. Scully - 1988 - Foundations of Physics 18 (10):1045-1056.
    When Humpty-Dumpty had his great fall nobody could put him together again. A vastly more moderate challenge is to reunite the two partial beams of a Stern-Gerlach apparatus with such precision that the original spin state is recovered. Nevertheless, as we demonstrate, a substantial loss of spin coherence always occurs, unless the experimenter is able to control the magnetic field's inhomogeneity with an accuracy of at least one part in 105.
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  2.  20
    Classical Analogs of Unitarily Equivalent Hamilton Operators.Berthold-Georg Englert - 1998 - Foundations of Physics 28 (3):375-384.
    A unitary transformation replaces the given description of a quantum system by an equivalent one. It is observed, however, that not all members of a set of unitarily equivalent Hamilton operators are equally well suited for identifying the corresponding classical systems. A criterion is proposed for recognizing the privileged representatives of the set. A few explicit examples are reported that show the criterion at work.
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    Book Review: Quantum Optics, by Marlan O. Scully and M. Suhail Zubairy. [REVIEW]Berthold-Georg Englert - 1999 - Foundations of Physics 29 (5):829-831.
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