Am Dienstag den 23. April setzt sich das IHT-Kolloquium fort, es spricht:
Ass. Prof. Christophe Galland
Laboratory of Quantum & Nano Optics,
Ecole Polytechnique Federale de Lausanne (EPFL), Schweiz
„Quantum State Preparation and Readout of Phonons”
Mechanical oscillators have become essential technological building blocks, being used for radio and microwave frequency filters or for clock signal generation. With the advent of quantum technologies, a new quest toward the manipulation of mechanical oscillators in the quantum regime has been launched. In this Colloquium, I will present the experimental research of my group at the boundary between ultrafast spectroscopy, quantum optics and nanoscience, in which we prepare non-classical states of vibrations in nano- and molecular scale oscillators.
I will show how we can create a single quantum of vibration involving the collective motion of billions of atoms in a crystal [1,2], and how we can engineer a quantum superposition between two of these vibrational modes. This non-classical state of oscillation features non-local correlations in space time and violation of a Bell inequality .
I will explain how our technique can be extended to manipulate a broader range of nanoscale oscillators in the quantum regime, enabling new ways to process quantum information at ultrafast timescales, and opening a new window into quantum phenomena occurring in molecular and solid-state systems.
 M. D. Anderson, S. T. Velez, K. Seibold, H. Flayac, V. Savona, N. Sangouard, and C. Galland, “Two-Color Pump-Probe Measurement of Photonic Quantum Correlations Mediated by a Single Phonon,” Phys. Rev. Lett. 120, 233601 (2018).
 S. Tarrago Velez, K. Seibold, N. Kipfer, M. D. Anderson, V. Sudhir, C. Galland. “Birth and death of a single quantum of vibration” arXiv preprint arXiv:1811.03038v2 (2018).
 S. Tarrago Velez et al., in preparation (2019).