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Basso Basset F, Rota MB, Beccaceci M, Krieger TM, Buchinger Q, Neuwirth J, Huet H, Stroj S, Covre da Silva SF, Ronco G, Schimpf C, Höfling S, Huber-Loyola T, Rastelli A, Trotta R. Signatures of the Optical Stark Effect on Entangled Photon Pairs from Resonantly Pumped Quantum Dots. Phys Rev Lett 2023; 131:166901. [PMID: 37925701 DOI: 10.1103/physrevlett.131.166901] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/24/2023] [Revised: 05/05/2023] [Accepted: 08/02/2023] [Indexed: 11/07/2023]
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.
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Affiliation(s)
- F Basso Basset
- Department of Physics, Sapienza University of Rome, 00185 Rome, Italy
| | - M B Rota
- Department of Physics, Sapienza University of Rome, 00185 Rome, Italy
| | - M Beccaceci
- Department of Physics, Sapienza University of Rome, 00185 Rome, Italy
| | - T M Krieger
- Institute of Semiconductor and Solid State Physics, Johannes Kepler University, 4040 Linz, Austria
| | - Q Buchinger
- Technical Physics, University of Würzburg, 97074 Würzburg, Germany
| | - J Neuwirth
- Department of Physics, Sapienza University of Rome, 00185 Rome, Italy
| | - H Huet
- Department of Physics, Sapienza University of Rome, 00185 Rome, Italy
| | - S Stroj
- Forschungszentrum Mikrotechnik, FH Vorarlberg, 6850 Dornbirn, Austria
| | - S F Covre da Silva
- Institute of Semiconductor and Solid State Physics, Johannes Kepler University, 4040 Linz, Austria
| | - G Ronco
- Department of Physics, Sapienza University of Rome, 00185 Rome, Italy
| | - C Schimpf
- Institute of Semiconductor and Solid State Physics, Johannes Kepler University, 4040 Linz, Austria
| | - S Höfling
- Technical Physics, University of Würzburg, 97074 Würzburg, Germany
| | - T Huber-Loyola
- Technical Physics, University of Würzburg, 97074 Würzburg, Germany
| | - A Rastelli
- Institute of Semiconductor and Solid State Physics, Johannes Kepler University, 4040 Linz, Austria
| | - R Trotta
- Department of Physics, Sapienza University of Rome, 00185 Rome, Italy
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Basso Basset F, Rota MB, Schimpf C, Tedeschi D, Zeuner KD, Covre da Silva SF, Reindl M, Zwiller V, Jöns KD, Rastelli A, Trotta R. Entanglement Swapping with Photons Generated on Demand by a Quantum Dot. Phys Rev Lett 2019; 123:160501. [PMID: 31702339 DOI: 10.1103/physrevlett.123.160501] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/19/2019] [Indexed: 06/10/2023]
Abstract
Photonic entanglement swapping, the procedure of entangling photons without any direct interaction, is a fundamental test of quantum mechanics and an essential resource to the realization of quantum networks. Probabilistic sources of nonclassical light were used for seminal demonstration of entanglement swapping, but applications in quantum technologies demand push-button operation requiring single quantum emitters. This, however, turned out to be an extraordinary challenge due to the stringent prerequisites on the efficiency and purity of the generation of entangled states. Here we show a proof-of-concept demonstration of all-photonic entanglement swapping with pairs of polarization-entangled photons generated on demand by a GaAs quantum dot without spectral and temporal filtering. Moreover, we develop a theoretical model that quantitatively reproduces the experimental data and provides insights on the critical figures of merit for the performance of the swapping operation. Our theoretical analysis also indicates how to improve state-of-the-art entangled-photon sources to meet the requirements needed for implementation of quantum dots in long-distance quantum communication protocols.
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Affiliation(s)
- F Basso Basset
- Department of Physics, Sapienza University of Rome, 00185 Rome, Italy
| | - M B Rota
- Department of Physics, Sapienza University of Rome, 00185 Rome, Italy
| | - C Schimpf
- Institute of Semiconductor and Solid State Physics, Johannes Kepler University, 4040 Linz, Austria
| | - D Tedeschi
- Department of Physics, Sapienza University of Rome, 00185 Rome, Italy
| | - K D Zeuner
- Department of Applied Physics, Royal Institute of Technology, 106 91 Stockholm, Sweden
| | - S F Covre da Silva
- Institute of Semiconductor and Solid State Physics, Johannes Kepler University, 4040 Linz, Austria
| | - M Reindl
- Institute of Semiconductor and Solid State Physics, Johannes Kepler University, 4040 Linz, Austria
| | - V Zwiller
- Department of Applied Physics, Royal Institute of Technology, 106 91 Stockholm, Sweden
| | - K D Jöns
- Department of Applied Physics, Royal Institute of Technology, 106 91 Stockholm, Sweden
| | - A Rastelli
- Institute of Semiconductor and Solid State Physics, Johannes Kepler University, 4040 Linz, Austria
| | - R Trotta
- Department of Physics, Sapienza University of Rome, 00185 Rome, Italy
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