Spatial symmetry and conservation of orbital angular momentum in spontaneous parametric down-conversion

Sheng Feng*, Prem Kumar

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

24 Scopus citations

Abstract

Directly contradictory arguments coexist regarding the conservation rule of orbital angular momentum in spontaneous parametric down-conversion. We analytically show how this rule is decided by spatial symmetry. We discover that the down-converted photon pairs can carry non-negligible extrinsic orbital angular momentum in the degrees of relative-movement freedom due to spatial symmetry breaking, leading to nonconservation of total orbital angular momentum in type-II down-conversion. Also, we demonstrate that the traditional technique does not measure the extrinsic orbital angular momentum.

Original languageEnglish (US)
Article number163602
JournalPhysical review letters
Volume101
Issue number16
DOIs
StatePublished - Oct 17 2008

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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