The Wigner-Araki-Yanase Theorem and Its Extension in Quantum Measurement with Generalized Coherent States : General and Mathematical Physics
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概要
- 論文の詳細を見る
The relationship between the measurement of an operator and the presence of a conservation law is studied using generalized coherent states. It is shown that an operator which does not commute with a conserved quantity cannot be measured exactly; this is an extension of the theorem by Wigner, Araki and Yanase, expressing the conserved quantity in a more general form. Classical operators play an important role in this approach. We present a simple model of the approximate measurement of a particle-spin which does not commute with the (additive) conserved angular momentum. Also, using two other models we show that the condition of distinguishability of pointer-operators is consistent with the situation where the statistical operator in a physical system tends to just its mixed-part.
- 理論物理学刊行会の論文
- 1992-01-25
著者
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KAKAZU Kiyotaka
Department of Physics and Earth Sciences, University of the Ryukyus
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Kudaka Shoju
Department Of Physics University Of The Ryukyus
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Kakazu Kiyotaka
Department Of Physics And Earth Sciences University Of The Ryukyu
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KAKAZU Kiyotaka
Department of Physics and Earth Sciences, University of the Ryukyu
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KAKAZU Kiyotaka
Department of Physics, University of the Ryukyus
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KAKAZU Kiyotaka
Department of Physics and Earth Sciences,University of the Ryukyus
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