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.
Leach
J
J
Department of Physics and Astronomy, SUPA, University of Glasgow, Glasgow, UK. j.leach@physics.gla.ac.uk
Jack
B
B
Romero
J
J
Ritsch-Marte
M
M
Boyd
R W
RW
Jha
A K
AK
Barnett
S M
SM
Franke-Arnold
S
S
Padgett
M J
MJ