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23 April 2024

» arxiv » quant-ph/0305054

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An experimental observation of geometric phases for mixed states using NMR interferometry
Jiangfeng Du ; Ping Zou ; Mingjun Shi ; Leong Chuan Kwek ; Jian-Wei Pan ; Choo Hiap Oh ; Artur Ekert ; Daniel K. L. Oi ; Marie Ericsson ;
Date:	9 May 2003
Journal:	Phys. Rev. Lett. 91, 100403 (2003) DOI: 10.1103/PhysRevLett.91.100403
Subject:	quant-ph
Abstract:	Examples of geometric phases abound in many areas of physics. They offer both fundamental insights into many physical phenomena and lead to interesting practical implementations. One of them, as indicated recently, might be an inherently fault-tolerant quantum computation. This, however, requires to deal with geometric phases in the presence of noise and interactions between different physical subsystems. Despite the wealth of literature on the subject of geometric phases very little is known about this very important case. Here we report the first experimental study of geometric phases for mixed quantum states. We show how different they are from the well understood, noiseless, pure-state case.
Source:	arXiv, quant-ph/0305054
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