Abstract

Traditionally, entanglement was considered to be a quirk of microscopic objects that defied a common-sense explanation. Now, however, entanglement is recognized to be ubiquitous and robust. With the realization that entanglement can occur in macroscopic systems — and with the development of experiments aimed at exploiting this fact — new tools are required to define and quantify entanglement beyond the original microscopic framework.

1. School of Physics and Astronomy, University of Leeds, Leeds LS2 9JT, UK.
2. Centre for Quantum Technologies, National University of Singapore, 3 Science Drive 2, Singapore 117543.
3. Department of Physics, National University of Singapore, 2 Science Drive 3, Singapore 117542.

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