Quantum momentum distribution and quantum entanglement in the deep tunneling regime

Yantao Wu, Roberto Car

Research output: Contribution to journalArticlepeer-review

1 Scopus citations


In this paper, we consider the momentum operator of a quantum particle directed along the displacement of two of its neighbors. A modified open-path path integral molecular dynamics is presented to sample the distribution of this directional momentum distribution, where we derive and use a new estimator for this distribution. Variationally enhanced sampling is used to obtain this distribution for an example molecule, malonaldehyde, in the very low temperature regime where deep tunneling happens. We find no secondary feature in the directional momentum distribution and that its absence is due to quantum entanglement through a further study of the reduced density matrix.

Original languageEnglish (US)
Article number024106
JournalJournal of Chemical Physics
Issue number2
StatePublished - Jan 14 2020

All Science Journal Classification (ASJC) codes

  • General Physics and Astronomy
  • Physical and Theoretical Chemistry


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