Quantum gravitational decoherence of matter waves

Charles Hou-Tzao Wang, Robert Bingham, J. Tito Mendonca

Research output: Contribution to journalArticle

47 Citations (Scopus)

Abstract

One of the biggest unsolved problems in physics is the unification of quantum mechanics and general relativity. The lack of experimental guidance has made the issue extremely evasive, though various attempts have been made to relate the loss of matter wave coherence to quantum spacetime fluctuations. We present a new approach to the gravitational decoherence near the Planck scale, made possible by the recently discovered conformal structure of canonical gravity. This leads to a gravitational analogue of Brownian motion whose correlation length is given by the Planck length up to a scaling factor. With input from recent matter wave experiments, we show the minimum value of this factor to be well within the expected range for quantum gravity theories. This suggests that the sensitivities of advanced matter wave interferometers may be approaching the fundamental level due to quantum spacetime fluctuations, and that investigating Planck scale physics using matter wave interferometry may become a reality in the near future.

Original languageEnglish
Article number L59
Number of pages7
JournalClassical and Quantum Gravity
Volume23
Issue number18
DOIs
Publication statusPublished - 21 Sep 2006

Keywords

  • space-time fluctuations
  • packets
  • gravity

Cite this

Quantum gravitational decoherence of matter waves. / Wang, Charles Hou-Tzao; Bingham, Robert; Mendonca, J. Tito.

In: Classical and Quantum Gravity, Vol. 23, No. 18, L59 , 21.09.2006.

Research output: Contribution to journalArticle

Wang, Charles Hou-Tzao ; Bingham, Robert ; Mendonca, J. Tito. / Quantum gravitational decoherence of matter waves. In: Classical and Quantum Gravity. 2006 ; Vol. 23, No. 18.
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