Violation of a Bell inequality in two-dimensional orbital angular momentum state-spaces.
We observe entanglement between photons in controlled super-position states of orbital angular momentum (OAM). By drawing a direct analogy between OAM and polarization states of light, we demonstrate the entangled nature of high order OAM states generated by spontaneous downconversion through violation of a suitable Clauser Horne Shimony Holt (CHSH)-Bell inequality. We demonstrate this violation in a number of two-dimensional subspaces of the higher dimensional OAM Hilbert space.
Department of Physics and Astronomy, SUPA, University of Glasgow, Glasgow, UK. j.leach@physics.gla.ac.uk
J
J
Leach
B
B
Jack
J
J
Romero
M
M
Ritsch-Marte
R W
RW
Boyd
A K
AK
Jha
S M
SM
Barnett
S
S
Franke-Arnold
M J
MJ
Padgett