Birefringent spin-photon interface generates polarization entanglement

• URL: http://arxiv.org/abs/2404.16025v1
• Date: Wed, 24 Apr 2024 17:56:48 GMT
• Title: Birefringent spin-photon interface generates polarization entanglement
• Authors: Nikita Leppenen, Dmitry S. Smirnov,
• Abstract summary: A spin-photon interface based on a singly charged quantum dot in a micropillar cavity allows for the creation of photonic entangled states. We show that the concurrence of the spin-photon state equal to one and complete quantum dot population can be reached for a micropillar cavity with any degree of birefringence.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: A spin-photon interface based on the luminescence of a singly charged quantum dot in a micropillar cavity allows for the creation of photonic entangled states. Current devices suffer from cavity birefringence, which limits the generation of spin-photon entanglement. In this paper, we theoretically study the light absorption and emission by the interface with an anisotropic cavity and derive the maximal excitation and spin-photon entanglement conditions. We show that the concurrence of the spin-photon state equal to one and complete quantum dot population inversion can be reached for a micropillar cavity with any degree of birefringence by tuning the quantum dot resonance strictly between the cavity modes. This sweet spot is also valid for generating a multiphoton cluster state, as we demonstrate by calculating the three-tangle and fidelity with the maximally entangled state.

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