macroscopicity

plural macroscopicities

1. uncountableThe quality or state of being macroscopic.

   In contrast, permutation-symmetric pure states feature rather low geometric entanglement and strong and robust macroscopicity

   2015, Malte C. Tichy, Chae-Yeun Park, Minsu Kang, Hyunseok Jeong, Klaus Mølmer, “Is macroscopic entanglement a typical trait of many-particle quantum states?”, in arXiv

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   ...it appears to be a small step from (1) and (2) to the identification of a sufficiently large mass with a macroscopic mass and, by analogy, to the consideration as macroscopic any system having sufficiently large quantum numbers associated with it, as well as to accept such macroscopicity as sufficient for classicality.

   2014 September 28, Gregg Jaeger, “What in the (quantum) world is macroscopic?”, in American Journal of Physics, volume 82, number 9, pages 896–905

2. countablequantum mechanicsA formal measure of the size of a quantum mechanical system or experiment which, while typically larger than the atomic scale, has not undergone decoherence.

   Macroscopicities of a representative selection of quantum superposition experiments with mechanical systems plotted against their publication date (adapted from [17] with additional data).

   2014, Stefan Nimmrichter, Macroscopic Matter-Wave Interferometry, Springer, page 230

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   2014, M. Arndt, et al., Matter wave interferometry with composite quantum objects, G. M. Tino, M. A. Kasevich (editors), Interferometria atomica, Società Italiana di Fisica, [jointly published as Atom Interferometry, IOS Press], page 136, Macroscopicities for a selection of neutron, atom, molecule and SQUID superposition experiments ordered according to their publication date.