Lecturer: Mr. Assaf Shaham
Affiliation: Racah Institute of Physics,
Hebrew University of Jerusalem
Abstract:
Dissertation talk - Quantum decoherence is
usually an unwanted effect, and efforts are
made to minimize it. This is because it acts
as an information noise that encumbers the
realization of many quantum information
schemes and protocols. It appears that
creating such noise with well defined
properties is also a hard task. We will
present a way in which we apply such noise
in a controllable way on quantum bits
(qubits) encoded in the polarization of
single photons. The implementation and the
characterization of principal unital quantum
channels such as dephasing and isotropic
channels using birefringent crystals will be
discussed.
Applying the noisy channels to photon
pairs, we were able to explore the quantum-
to-classical transition of initial quantum
states. We will elaborate on the ability of
the photon pairs to exhibit entanglement or
other quantum correlations such as
nonlocality and contextuality in the
presence of different types and levels of
noise. Specifically, we will show that the
generated initial states can exhibit quantum
contextuality by violating the Klyachko-
Can-Binicioğlu-Shumovsky (KCBS)
inequality, and that the predicted hierarchy
between quantum nonlocality and KCBS
contextuality (i.e., KCBS contextuality
implies nonlocality) is valid for states that
experienced different types of decohering
unital channels.