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第2回世話人 都倉康弘
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Date: Dec, 19 2013 13:00-14:30
Place: 総合B-107

Title: Nonlocality in ontological models of quantum theory

Speaker: Fumiaki Morikoshi (NTT Basic Research Laboratories)

Abstract:
Nonlocality is a fundamental characteristic of quantum theory, which
was shown by Bell with his famous inequality.
As is well known, the weirdness of the nonlocal feature was first
pointed out in the EPR paper in the early days of quantum theory.
However, it is not well known that Einstein also developed a beautiful
argument that relates the nonlocal character of entangled states and the
ontological status of quantum states in his unpublished work;
Nonlocality is directly linked to the question of whether quantum states
correspond to physical realities or not.
Recent advances in quantum information theory and quantum foundations
made it possible to take a fresh look at this fundamental problem and
revealed an intimate connection between nonlocality and the ontological
nature of quantum states.
In this talk, I will introduce the direct proof of nonlocality without
Bell inequalities and generalise it to multipartite entangled states.
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[ POSTER  for distribution ]

 

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3. 山本氏「」 Jan. xx, 2014

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現在の時刻
今年もやります。まずは量子力学3. 冬は 統計力学2. 平成29年の新年あけましておめでとうございます。今年もあと39日!
最新ニュース
投稿者 : hatsugai 投稿日時: 2017-10-06 16:36:02 (82 ヒット)

The entanglement Chern numbers is a Chern number of an entanglement Hamiltonian which characterizes topological properties of a topological phase. Starting from a pure state density matrix of the ground state, one may obtain finite temperature (mixed state) density matrix by tracing out parts of the system. If the entanglement hamiltonian has a finite energy gap, the Chern number is well defined by lowering the temperature. We apply the concept for the 3D topological phases.The parity of the number of the Weyl point gives a well defined topological number to distinguish the the state is topologically non trivial. Have a look at arXiv 1708.03722 . The paper has been accepted for publication in Physical Review B.


投稿者 : hatsugai 投稿日時: 2017-08-17 17:01:30 (306 ヒット)

初貝研究室では今回助教2名を公募いたします(公募締め切り2017年9月15日)。委細は [助教公募] をご確認ください。適任者のご推薦、ご応募の方よろしくお願いいたします。


投稿者 : hatsugai 投稿日時: 2017-08-17 17:00:09 (351 ヒット)

We are organizing a Japan-Swiss workshop TTCM2017 at EPOCHAL Tsukuba, Sep.10-13 (2017). Limited number of posters will be still accepted.


投稿者 : hatsugai 投稿日時: 2017-08-03 13:38:17 (274 ヒット)

A numerical scheme to calculate the many body Chern number for a ground state multiplet is formulated and explicitly given for projected bands of any lattice. We demonstrate its validity for lattice analogue of the nu=1/3 and 1/2 states. The string gauge to realize the minimum flux compatible with the periodicity of the unit cell is also presented. [arXiv:1707.06722]. The paper is published in JPSJ lett.



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    [3] トポロジカル秩序とベリー接続:日本物理学会誌 「解説」 [JPS-HP] [pdf]
    [4] "Band gap, dangling bond and spin : a physicist's viewpoint" [pdf] [Web]
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