Quantum 2025 – wissenschaftliches Programm
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TUE: Tuesday Contributed Sessions
TUE 11: Quantum Optics and Quantum Computation
TUE 11.1: Vortrag
Dienstag, 9. September 2025, 14:15–14:30, ZHG104
Collective photon emission of correlated atoms in free space — •Joachim von Zanthier1, Stefan Richter1, Sebastian Wolf2, and Ferdinand Schmidt-Kaler2 — 1Universität Erlangen-Nürnberg, 91058 Erlangen — 2Universität Mainz, 55128 Mainz
Superradiance is one of the enigmatic problems in quantum optics since Dicke introduced the concept of coherent spontaneous emission by an ensemble of identical atoms in highly entangled Dicke states [1]. While single excited Dicke states have been investigated, the production of Dicke states with higher number of excitations remains a challenge. We generate these states via successive measurement of photons at particular positions in the far field starting from the fully excited system [2]. In this case, the collective system cascades down the ladder of symmetric Dicke states each time a photon is recorded. We apply this scheme to demonstrate directional super- and subradiance with two trapped Ca+ ions [3]. The arrangement for preparing the Dicke states and subsequently recording directional super- and subradiance corresponds to a generalized HBT setup. This shows that the two fundamental phenomena of quantum optics, Dicke superradiance and HBT interference, are two sides of the same coin. We also outline how to map the symmetric Dicke states onto the long-lived ground state Zeemann-levels of the Ca+ ions [4].
[1] R. H. Dicke, Phys. Rev. 93, 99 (1954).
[2] S. Oppel et al., PRL 113, 263606 (2014).
[3] S. Richter et al., PRR 5, 013163 (2023).
[4] M. Verde et al., ArXiv 2404.12513.
Keywords: Superradiance; Entangled (Dicke) States; Projective Measurements; Multi-Photon Interference