Two-photon excitation with finite pulses unlocks pure dephasing-induced
degradation of entangled photons emitted by quantum dots
- URL: http://arxiv.org/abs/2301.10820v3
- Date: Fri, 23 Jun 2023 16:47:52 GMT
- Title: Two-photon excitation with finite pulses unlocks pure dephasing-induced
degradation of entangled photons emitted by quantum dots
- Authors: Tim Seidelmann, Thomas K. Bracht, Barbara Ursula Lehner, Christian
Schimpf, Michael Cosacchi, Moritz Cygorek, Alexei Vagov, Armando Rastelli,
Doris E. Reiter, Vollrath Martin Axt
- Abstract summary: Two-photon excitation limits the achievable degree of entanglement by introducing which-path information.
Two-photon excitation and longitudinal acoustic phonons on photon pairs emitted by strongly-confining quantum dots is investigated.
- Score: 0.0
- License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
- Abstract: Semiconductor quantum dots have emerged as an especially promising platform
for the generation of polarization-entangled photon pairs. However, it was
demonstrated recently that the two-photon excitation scheme employed in
state-of-the-art experiments limits the achievable degree of entanglement by
introducing which-path information. In this work, the combined impact of
two-photon excitation and longitudinal acoustic phonons on photon pairs emitted
by strongly-confining quantum dots is investigated. It is found that phonons
further reduce the achievable degree of entanglement even in the limit of
vanishing temperature due to phonon-induced pure dephasing and phonon-assisted
one-photon processes, which increase the reexcitation probability. In addition,
the degree of entanglement, as measured by the concurrence, decreases with
rising temperature and/or pulse duration, even if the excitonic fine-structure
splitting is absent and when higher electronic states are out of reach.
Furthermore, in the case of finite fine-structure splittings, phonons enlarge
the discrepancy in concurrence for different laser polarizations.
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