SAMOP 2021 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 17: Quantum Effects
Q 17.3: Poster
Thursday, September 23, 2021, 16:30–18:30, P
Photon-number entanglement generated by sequential excitation of a two-level atom — Stephen C Wein1, Juan Carlos Loredo2, Maria Maffei3, Paul Hilaire2, Abdelmounaim Harouri2, Niccolo Somaschi4, Aristide Lemaitre2, Isabel Sagnes2, Loic Lanco2,5, Olivier Krebs2, Alexia Auffeves3, Christoph Simon1, Pascale Senellart2, and •Carlos Anton-Solanas2,6 — 1University of Calgary, Canada — 2C2N-CNRS, France — 3Institut Néel-CNRS France — 4Quandela SAS, France — 5Univ. Paris Diderot, France — 6Carl von Ossietzky Univ., Germany
During the spontaneous emission of light from an excited two-level atom, the atom briefly becomes entangled with the photonic field, producing the entangled state α|e,0⟩+β|g,1⟩, where g and e are the ground and excited states of the atom, and 0 and 1 are the vacuum and single photon states. We experimentally show that the spontaneous emission can be used to deliver on demand photon-number entanglement encoded in time. By exciting a charged quantum dot (an artificial two-level atom) with two sequential π pulses, we generate a photon-number Bell state α|00⟩+β|11⟩. We characterize the quantum properties of this state using time-resolved photon correlation measurements. We theoretically show that applying longer sequences of π pulses to a two-level atom can produce multipartite time-entangled states with properties linked to the Fibonacci sequence. Our results show that spontaneous emission is a powerful entanglement resource and it can be further exploited to generate new quantum photonic states (multipartite and also high-dimensional entangled states.