Title: Cooperative Effects in Closely Packed Quantum Emitters with Collective Dephasing

Speaker: Dr. Prasanna Venkatesh, IQOQI Innsbruck

Abstract: The main topic of the talk will be a recent work [1], where we showed that the dipole force on a closely packed ensemble of strongly driven two-level quantum emitters, which collectively dephase, is enhanced in comparison to the dipole force on an independent non-interacting ensemble. Such a result is intriguing since in a closely packed ensemble of quantum emitters cooperative effects are typically suppressed due to the dephasing induced by the dipole-dipole interactions. In contrast we show that by adding sufficiently strong collective dephasing cooperative effects can be restored. Our results are relevant to solid-state systems with embedded quantum emitters such as colour centers in diamond and superconducting qubits in microwave cavities and waveguides. In the last part of the talk, I plan to provide an overview of the different research topics that I have pursued so far, as well as highlight future directions for our research program.

[1]. B. Prasanna Venkatesh, M. L. Juan, and O. Romero-Isart, Phys. Rev. Lett.120, 033602 (2018)