Spatial Symmetry and Conservation of Orbital Angular Momentum in Spontaneous Parametric Down-Conversion
Journal Article
·
· Physical Review Letters
- Center for Photonic Communication and Computing, EECS Department, Northwestern University, Evanston, Illinois 60208-3118 (United States)
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.
- OSTI ID:
- 21179819
- Journal Information:
- Physical Review Letters, Vol. 101, Issue 16; Other Information: DOI: 10.1103/PhysRevLett.101.163602; (c) 2008 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0031-9007
- Country of Publication:
- United States
- Language:
- English
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