理論セミナー

日時: 2011-01-20 15:00 -
場所: 研究本館3階322室
会議名: Entanglement of Indistinguishable Particles
連絡先: 佐々木、tsasaki AT post.kek.jp
講演者: 市川 翼  (近畿大学)
講演言語: 英語
アブストラクト: Entanglement, which causes correlation stronger than classical one, plays a central role in quantum information science and foundation of quantum mechanics. For distinguishable particles, the theoretical formulation of entanglement is well-established and utilized as an important building block of theoretical works. On the other hand, for indistinguishable particles, we have no such rigid formulation. In this seminar, I talk about our formulation of the entanglement of indistinguishable particles. First, I point out that the entanglement of distinguishable particles is formulated on the basis of tensor product structure (TPS) of state space, which is not inherent for that of indistinguishable particles, because of (anti-)symmetrization. Second, I explain our method to implement TPS in the state space of indistinguishable particles. This is done by introducing a "measurement setup", which is represented as a set of orthogonal subspaces of one-particle state space. Third, I show implications of our formulation by various examples. We find that entanglement is relative to our choice of the measurement setups. Also, by this relative nature, we observe that our formulation reconciles former different approaches on this topic.

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