Quantum coherence and control in one- and two-photon optical systems
摘要
We investigate coherence in one- and two-photon optical systems, both theoretically and experimentally. In the first case, we develop the density operator representing a single photon state subjected to a non-dissipative coupling between observed (polarization) and unobserved (frequency) degrees of freedom. We show that an implementation of ``bang-bang'' quantum control protects photon polarization information from certain types of decoherence. In the second case, we investigate the existence of a "decoherence-free" subspace of the Hilbert space of two-photon polarization states under the action of a similar coupling. The density operator representation is developed analytically and solutions are obtained numerically. NOTE: This manuscript is taken from the author's undergraduate thesis (A.B. Dartmouth College, June 2000, advised by Dr. Walter E. Lawrence), under the supervision of Dr. Paul G. Kwiat.
引用
@article{arxiv.quant-ph/0010001,
title = {Quantum coherence and control in one- and two-photon optical systems},
author = {Andrew J. Berglund},
journal= {arXiv preprint arXiv:quant-ph/0010001},
year = {2007}
}
备注
18 pages, 11 figures, corrected top/bottom margins