Heidelberg 2015 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 57: Optomechanics II
Q 57.7: Vortrag
Donnerstag, 26. März 2015, 16:00–16:15, P/H1
Entanglement-enhanced quantum control of optomechanical systems — •Sebastian G. Hofer1,2, Markus Aspelmeyer1, and Klemens Hammerer2 — 1Vienna Center for Quantum Science and Technology (VCQ), Faculty of Physics, University of Vienna, Vienna, Austria — 2Institute for Theoretical Physics, Institute for Gravitational Physics (Albert Einstein Institute), Leibniz University Hannover, Hannover, Germany
The optomechanical radiation pressure interaction provides the means to create entanglement between a mechanical oscillator and an electromagnetic field. In this talk I show how we can utilize this entanglement within the framework of time-continuous quantum control in order to engineer the quantum state of the mechanical system. Specifically, I analyze how to prepare low-entropy mechanical states by feedback cooling operated in the blue detuned regime, the creation of bipartite mechanical entanglement via time-continuous entanglement swapping, and preparation of a squeezed mechanical state by time-continuous teleportation [1]. Furthermore I discuss how additionally coupling the light field to a qubit can be used to prepare non-classical mechanical quantum states. These protocols extend earlier work [2] analyzing pulsed optomechanical entanglement creation—recently realized experimentally in [3]—and teleportation. They are all feasible in optomechanical systems exhibiting a cooperativity larger than 1.
[1] S.G. Hofer and Klemens Hammerer, arXiv:1411.1337 [quant-ph]
[2] S.G. Hofer et al., Physical Review A 84, 052327 (2011)
[3] T.A. Palomaki et al., Science 342, 710 (2013)