@article{oai:oist.repo.nii.ac.jp:00000228,
 author = {Oriols, Xavier and Benseny, Albert},
 journal = {New Journal of Physics},
 month = {Jun},
 note = {We discuss the conditions for the classicality of quantum states with a very large number of identical particles. By defining the center of mass from a large set of Bohmian particles, we show that it follows a classical trajectory when the distribution of the Bohmian particle positions in a single experiment is always equal to the marginal distribution of the quantum state in physical space. This result can also be interpreted as a single experiment generalization of the well-known Ehrenfest theorem. We also demonstrate that the classical trajectory of the center of mass is fully compatible with a quantum (conditional) wave function solution of a classical non-linear Schrödinger equation. Our work shows clear evidence for a quantum–classical inter-theory unification, and opens new possibilities for practical quantum computations with decoherence.},
 title = {Conditions for the classicality of the center of mass of many-particle quantum states},
 volume = {19},
 year = {2017}
}