Cooling thorough parametric modulations and phase-preserving quantum measurements

by Dr Sofia Qvarfort (SU )

Thursday 24 Mar 2022, 13:00 → 15:00 Europe/Stockholm

AlbaNova C4:3059 - Café Planck (AlbaNova Main Building)

Near-ground state or ground-state cooling is a necessity for many quantum systems, especially mechanical resonators in the quantum regime. In this talk, we will present a cooling protocol that uses phase-dependent parametric modulations of the trapping potential and phase-preserving quantum measurements to cool a quantum harmonic oscillator to near its quantum-mechanical ground-state. In the first part of the talk, we solve the dynamics that arises from the parametric modulations and demonstrate that there is an optimal phase relation between the state and the modulations that allows for cooling. In the second part of the talk, we show that by using sequential measurements and potential modulations, any initial quantum state, including thermal states, can be cooled to near the ground state, even in the presence of a thermal environment.

The talk will be presented jointly with Sreenath K Manikandan (SU).

The talk will also be given on zoom

https://kth-se.zoom.us/j/68888238166