Feedback control of quantum entanglement in a two-spin system

Naoki Yamamoto, Koji Tsumura, Shinji Hara

研究成果: Conference contribution

3 被引用数 (Scopus)

抄録

A pair of spins is the most simple quantum system that can possess entanglement, a non-classical property playing an essential role in quantum information technologies. In this paper, feedback control problems of the two-spin system conditioned on a continuous measurement are considered. In order to make some useful formulas in stochastic control theory directly applicable, we first derive a two-dimensional description of the system. We then prove that a feedback controller stabilizes an entangled state of the two spins almost globally with probability one. Furthermore, it is shown that another entangled state, which corresponds to a non-equilibrium point of the dynamics, is stabilized via feedback in the sense that the expectation of the distance from the target can be made arbitrarily small.

本文言語English
ホスト出版物のタイトルProceedings of the 44th IEEE Conference on Decision and Control, and the European Control Conference, CDC-ECC '05
ページ3182-3187
ページ数6
DOI
出版ステータスPublished - 2005
イベント44th IEEE Conference on Decision and Control, and the European Control Conference, CDC-ECC '05 - Seville, Spain
継続期間: 2005 12 122005 12 15

出版物シリーズ

名前Proceedings of the 44th IEEE Conference on Decision and Control, and the European Control Conference, CDC-ECC '05
2005

Other

Other44th IEEE Conference on Decision and Control, and the European Control Conference, CDC-ECC '05
CountrySpain
CitySeville
Period05/12/1205/12/15

ASJC Scopus subject areas

  • Engineering(all)

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