Quantum coherence and interaction-free measurements
量子物理
2009-11-06 v1
摘要
We investigate the extent to which ``interaction-free'' measurements perturb the state of quantum systems. We show that the absence of energy exchange during the measurement is not a sufficient criterion to preserve that state, as the quantum system is subject to measurement dependent decoherence. While it is possible in general to design interaction-free measurement schemes that do preserve that state, the requirement of quantum coherence preservation rapidly leads to a very low efficiency. Our results, which have a simple interpretation in terms of ``which-way'' arguments, open up the way to novel quantum non-demolition techniques.
引用
@article{arxiv.quant-ph/0007014,
title = {Quantum coherence and interaction-free measurements},
author = {S. Potting and E. S. Lee and W. Schmitt and I. Rumyantsev and B. Mohring and P. Meystre},
journal= {arXiv preprint arXiv:quant-ph/0007014},
year = {2009}
}
备注
4 pages incl. 2 PostScript figures (.eps), LaTeX using RevTeX, submitted to Phys. Rev. A (Rapid Comm.)