INCREASE OF AVERAGE ENERGY BY THE PROCESS OF MEASUREMENT
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Undergraduate course
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Editions Physique
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Article
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Acesso restrito
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Abstract
A paradox is pointed out and resolved by proving that the average energy E = [H] of a macroscopic system in thermal equilibrium must increase by the measurement of an observable A which does not commute with the Hamiltonian H. The proof follows as a corollary of a more general result, which states that under certain conditions the expectation value [C] of an observable C should increase by the measurement of another observable A, if [A, C] not-equal 0.
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English
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Europhysics Letters. Les Ulis Cedex: Editions Physique, v. 18, n. 3, p. 189-194, 1992.
