Pulsed generation of quantum coherences and non-classicality in light-matter systems

Fernando J. Gómez-Ruiz, Oscar L. Acevedo, Ferney J. Rodríguez, Luis Quiroga, Neil F Johnson

Research output: Contribution to journalArticle

2 Scopus citations

Abstract

We show that a pulsed stimulus can be used to generate many-body quantum coherences in light-matter systems of general size. Specifically, we calculate the exact time-evolution of an N qubit system coupled to a global boson field, in response to an up-down pulse. The pulse is chosen so that the system dynamically crosses the system's quantum phase transition on both the up and down portion of the cycle. We identify a novel form of dynamically-driven quantum coherence emerging for general N and without having to access the empirically challenging strong-coupling regime. Its properties depend on the speed of the changes in the stimulus. Non-classicalities arise within each subsystem that have eluded previous analyses. Our findings show robustness to losses and noise, and have potential functional implications at the systems level for a variety of nanosystems, including collections of N atoms, molecules, spins, or superconducting qubits in cavities-and possibly even vibration-enhanced light-harvesting processes in macromolecules.

Original languageEnglish (US)
Article number92
JournalFrontiers in Physics
Volume6
Issue numberAUG
DOIs
StatePublished - Aug 17 2018
Externally publishedYes

Keywords

  • Dicke model
  • Driven quantum coherences
  • Electronic-vibrational entanglement
  • Many-body quantum system
  • Non-classicalities

ASJC Scopus subject areas

  • Biophysics
  • Materials Science (miscellaneous)
  • Mathematical Physics
  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

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    Gómez-Ruiz, F. J., Acevedo, O. L., Rodríguez, F. J., Quiroga, L., & Johnson, N. F. (2018). Pulsed generation of quantum coherences and non-classicality in light-matter systems. Frontiers in Physics, 6(AUG), [92]. https://doi.org/10.3389/fphy.2018.00092