Two-photon resonant excitation of the biexciton-exciton cascade in a quantum dot generates highly polarization-entangled photon pairs in a near-deterministic way. However, the ultimate level of achievable entanglement is still debated. Here, we observe the impact of the laser-induced ac-Stark effect on the quantum dot emission spectra and on entanglement. For increasing pulse-duration-to-lifetime ratios and pump powers, decreasing values of concurrence are recorded. Nonetheless, additional contributions are still required to fully account for the observed below-unity concurrence.
Signatures of the Optical Stark Effect on Entangled Photon Pairs from Resonantly Pumped Quantum Dots / Basso Basset, F; Rota, M B; Beccaceci, M; Krieger, T M; Buchinger, Q; Neuwirth, J; Huet, H; Stroj, S; Covre da Silva, S F; Ronco, G; Schimpf, C; Höfling, S; Huber-Loyola, T; Rastelli, A; Trotta, R. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - 131:16(2023), p. 166901. [10.1103/PhysRevLett.131.166901]
Signatures of the Optical Stark Effect on Entangled Photon Pairs from Resonantly Pumped Quantum Dots
Basso Basset, FCo-primo
;Rota, M BCo-primo
;Beccaceci, M;Neuwirth, J;Huet, H;Ronco, G;Trotta, R
Ultimo
2023
Abstract
Two-photon resonant excitation of the biexciton-exciton cascade in a quantum dot generates highly polarization-entangled photon pairs in a near-deterministic way. However, the ultimate level of achievable entanglement is still debated. Here, we observe the impact of the laser-induced ac-Stark effect on the quantum dot emission spectra and on entanglement. For increasing pulse-duration-to-lifetime ratios and pump powers, decreasing values of concurrence are recorded. Nonetheless, additional contributions are still required to fully account for the observed below-unity concurrence.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
