Entanglement robustness to excitonic spin precession in a quantum dot
- URL: http://arxiv.org/abs/2001.11833v1
- Date: Fri, 31 Jan 2020 13:50:51 GMT
- Title: Entanglement robustness to excitonic spin precession in a quantum dot
- Authors: Samir Bounouar, Gabriel Rein, Kisa Barkemeyer, Julian Schleibner,
Peter Schnauber, Manuel Gschrey, Jan-Hindrik Schulze, Andr\'e Strittmatter,
Sven Rodt, Andreas Knorr, Alexander Carmele, and Stephan Reitzenstein
- Abstract summary: A semiconductor quantum dot (QD) is an attractive resource to generate polarization-entangled photon pairs.
We study the excitonic spin precession (flip-flop) in a family of QDs with different excitonic fine-structure splitting (FSS)
Our results reveal that coherent processes leave the time post-selected entanglement of QDs unaffected while changing the eigenstates of the system.
- Score: 43.55994393060723
- License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
- Abstract: A semiconductor quantum dot (QD) is an attractive resource to generate
polarization-entangled photon pairs. We study the excitonic spin precession
(flip-flop) in a family of QDs with different excitonic fine-structure
splitting (FSS) and its impact on the entanglement of photons generated from
the excitonic-biexcitonic radiative cascade. Our results reveal that coherent
processes leave the time post-selected entanglement of QDs with finite FSS
unaffected while changing the eigenstates of the system. The flip-flop's
precession is observed via quantum tomography through anomalous oscillations of
the coincidences in the rectilinear basis. A theoretical model is constructed
with the inclusion of an excitonic flip-flop rate and is compared with a
two-photon quantum tomography measurement on a QD exhibiting the spin flip-flop
mechanism. A generalization of the theoretical model allows estimating the
degree of entanglement as a function of the FSS and the spin-flip rate. For a
finite temporal resolution, the negativity is found to be oscillating with
respect to both the FSS and the spin-flip rate. This oscillatory behavior
disappears for perfect temporal resolution and maximal entanglement is
retrieved despite the flip-flop process.
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