SKM 2021 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 14: Materials and devices for quantum technology (joint session HL/TT)
HL 14.7: Talk
Wednesday, September 29, 2021, 12:00–12:15, H4
Photon-number entanglement generated by sequential excitation of a two-level atom — Stephen C. Wein1, Juan C. Loredo2, Maria Maffei3, Paul Hilaire2, Abdou Harouri2, Niccolo Somaschi4, Aristide Lemaitre2, Isabelle Sagnes2, Loic Lanco2,5, Olivier Krebs2, Alexia Auffeves3, Christoph Simon1, Pascale Senellart2, and •Carlos Anton-Solanas2,6 — 1Univ. of Calgary, Canada — 2C2N-CNRS, France — 3Inst. Neel-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 [1].
We experimentally show that the spontaneous emission can be used to deliver on demand photon-number entanglement encoded in time [2]. 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.
[1] V. Weisskopf, E. Wigner, Zeitschrift für Physik 63, 54 (1930). [2] S. C. Wein, et al., arXiv:2106.02049 (2021).