Robust Entanglement through Macroscopic Quantum Jumps
摘要
We propose an entanglement generation scheme that requires neither the coherent evolution of a quantum system nor the detection of single photons. Instead, the desired state is heralded by a {\em macroscopic} quantum jump. Macroscopic quantum jumps manifest themselves as a random telegraph signal with long intervals of intense fluorescence (light periods) interrupted by the complete absence of photons (dark periods). Here we show that a system of two atoms trapped inside an optical cavity can be designed such that a dark period prepares the atoms in a maximally entangled ground state. Achieving fidelities above 0.9 is possible even when the single-atom cooperativity parameter C is as low as 10 and when using a photon detector with an efficiency as low as eta = 0.2.
引用
@article{arxiv.quant-ph/0510051,
title = {Robust Entanglement through Macroscopic Quantum Jumps},
author = {Jeremy Metz and Michael Trupke and Almut Beige},
journal= {arXiv preprint arXiv:quant-ph/0510051},
year = {2009}
}
备注
5 pages, 4 figures, more detailed discussion of underlying physical effect, references updated