Photon-number entanglement generated by sequential excitation of a two-level atom

• URL: http://arxiv.org/abs/2106.02049v2
• Date: Fri, 8 Apr 2022 16:23:32 GMT
• Title: Photon-number entanglement generated by sequential excitation of a two-level atom
• Authors: S. C. Wein, J. C. Loredo, M. Maffei, P. Hilaire, A. Harouri, N. Somaschi, A. Lema\^itre, I. Sagnes, L. Lanco, O. Krebs, A. Auff\`eves, C. Simon, P. Senellart, C. Ant\'on-Solanas
• Abstract summary: Entanglement and spontaneous emission are fundamental quantum phenomena that drive many applications of quantum physics. Here, we show that this natural process can be used to produce photon-number entangled states of light distributed in time. Our results on photon-number entanglement can be further exploited to generate new states of quantum light with applications in quantum technologies.
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• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Entanglement and spontaneous emission are fundamental quantum phenomena that drive many applications of quantum physics. During the spontaneous emission of light from an excited two-level atom, the atom briefly becomes entangled with the photonic field. Here, we show that this natural process can be used to produce photon-number entangled states of light distributed in time. By exciting a quantum dot -- an artificial two-level atom -- with two sequential $\pi$ pulses, we generate a photon-number Bell state. We characterise this state using time-resolved intensity and phase correlation measurements. Furthermore, we theoretically show that applying longer sequences of pulses to a two-level atom can produce a series of multi-temporal mode entangled states with properties intrinsically related to the Fibonacci sequence. Our results on photon-number entanglement can be further exploited to generate new states of quantum light with applications in quantum technologies.

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