Magnetic Levitation in Quantum Nanomechanics: New Opportunities

Oriol Romero
July 6th, 2016 ORIOL ROMERO-ISART IQOQI - Institute for Quantum Optics & Quantum Information
ITP - Institute for Theoretical Physics, University of Innsbruck

Several experimental groups are trying to bring and control the center-of-mass of an optically levitated dielectric nanosphere in the quantum regime. In this talk I will discuss and motivate an alternative approach based on magnetic levitation of nano- and micromagnets. In the first part of the talk we will discuss a recent theoretical proposal for an all-magnetic on-chip quantum interferometer scheme capable to prepare large quantum superpositions of a superconducting microsphere with a mass of 10^13 amu’s. As a figure of merit, we show that at such mass and superposition size scales, the faint gravitationally-induced decoherence model proposed by Penrose and Diósi in the 80’s could be unambiguously falsified. In the second part of the talk, we will discuss the possibility to magnetically levitate a single magnetic domain nanoparticle. We will show that at such small scales the Einstein-De Haas effect plays a crucial role in the stability of the trap. We will further discuss some on-going work on the possibility to bring the degrees of freedom of the nanomagnet in the quantum regime, namely the center-of-mass, the orientation, and the macrospin degree’s of freedom.

Seminar, July 6, 2016, 15:00. ICFO Auditorium

Hosted by ICFO Master School on Quantum Nano- and Opto-mechanics