Energy Preserved in Quantum Measurements - M. Isaacs, Richard
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This dissertation addresses the question of how energy is conserved in quantum measurement. This question is significant for a number of reasons: the conventional way of expressing conservation laws pertains only to isolated systems (whereas measurement always involves coupling to an external apparatus), the superposition principle implies that the energy of a quantum system may be poorly defined before and/or after a measurement, and measurements can affect the energy of a quantum system(either increasing or decreasing it on average).

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This dissertation addresses the question of how energy is conserved in quantum measurement. This question is significant for a number of reasons: the conventional way of expressing conservation laws pertains only to isolated systems (whereas measurement always involves coupling to an external apparatus), the superposition principle implies that the energy of a quantum system may be poorly defined before and/or after a measurement, and measurements can affect the energy of a quantum system(either increasing or decreasing it on average).