English

Is macroscopic entanglement a typical trait of many-particle quantum states?

Quantum Physics 2016-04-20 v1

Abstract

We elucidate the relationship between Schr\"odinger-cat-like macroscopicity and geometric entanglement, and argue that these quantities are not interchangeable. While both properties are lost due to decoherence, we show that macroscopicity is rare in uniform and in so-called random physical ensembles of pure quantum states, despite possibly large geometric entanglement. In contrast, permutation-symmetric pure states feature rather low geometric entanglement and strong and robust macroscopicity.

Keywords

Cite

@article{arxiv.1507.07679,
  title  = {Is macroscopic entanglement a typical trait of many-particle quantum states?},
  author = {Malte C. Tichy and Chae-Yeun Park and Minsu Kang and Hyunseok Jeong and Klaus Mølmer},
  journal= {arXiv preprint arXiv:1507.07679},
  year   = {2016}
}

Comments

13 pages, 9 figures