Researchers in ORNL’s Functional Hybrid Nanomaterials group conducted the
study with partners at Vanderbilt University, the University of Utah and Beijing
Computational Science Research Center.
The scientists plan to conduct future studies to explore how material composition
influences properties beyond the photovoltaic response, in order to incorporate
2D materials into devices.
The research was published in Science
Advances (doi: 10.1126/sciadv.1501882).
Twisted light explored for quantum communications
Schematic illustrating the growth of monolayer MoSe2 and GaSe/MoSe2 heterostructures.
ROCHESTER, N. Y. — “Twisted” light
holds promise as an enabler of quantum
communication, and an exprimental technique has yielded the first characterization of the azimuthal Wigner distribution
of a photon.
The discrete nature of orbital angular
momentum, or OAM, a defining parame-
ter of twisted light, makes it attractive for
encoding quantum information. There is
no known fundamental limit to the maxi-
mum OAM value that can be coded into
a photon, which could allow for quicker
communication than with other systems.
Researchers at the University of Rochester have reported a protocol to fully
characterize the transverse structure of
a photon in conjugate bases of OAM and
azimuthal angle. The team tested the
protocol by characterizing pure superpositions and incoherent mixtures of OAM
modes in a 7D space.
The Wigner distribution is a mathematical construct that completely describes a
system in terms of two conjugate variables, that is, two variables linked by
Heisenberg’s Uncertainty Principle.
Postdoctoral associate Mohammad
Mirhosseini and collaborators at Rochester’s Institute of Optics have now shown
how the Wigner distribution can be
obtained for twisted light.
Other methods to obtain the wave func-