Erlangen 2018 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
Q: Fachverband Quantenoptik und Photonik
Q 29: Quantum Optics and Photonics I
Q 29.2: Vortrag
Dienstag, 6. März 2018, 14:15–14:30, K 0.016
Stationary Collective Effects in Polarized Atomic Ensembles induced by off-resonant Probes — •Alexander Roth1, Kirill Tikhonov2, and Klemens Hammerer1 — 1Institute for Theoretical Physics, Leibniz University Hannover — 2St. Petersburg State University
We investigate atomic ensembles at room temperature with continuous optical pumping and off-resonant probing, which have previously been used in entanglement generation [1] and quantum back action evasion [2]. We show that the off-resonant probe acting collectively on all atoms induces atom-atom correlations leading to a superradiant behavior in the steady state. These collective effects can be tuned via the angle of linear polarization of the probe and influence relevant parameters such as the polarization and line-width significantly. Our numerical calculations with approximately 109 atoms use a new approach to the cumulant expansion allowing us to calculate higher correlation orders, such as the 8-atom cumulant. This new approach applies to a wide class of symmetric master equations and gives access to the reduced density matrix containing multi-atom correlations.
[1] Phys. Rev. Lett. 107, 080503 (2011)
[2] Nature 547, 191-195 (13 July 2017)