Cavity quantum phonon dynamics

Objectif

Large bodies usually follow the classical equations of motion. Deviations from this can be called
macroscopic quantum behavior. These phenomena have been experimentally verified with cavity Quantum
Electro Dynamics (QED), trapped ions, and superconducting Josephson junction systems. Recently, evidence
was obtained that also moving objects can display such behavior. These objects are micromechanical
resonators (MR), which can measure tens of microns in size and are hence quite macroscopic. The degree of
freedom is their vibrations: phonons.

I propose experimental research in order to push quantum mechanics closer to the classical world than ever
before. I will try find quantum behavior in the most classical objects, that is, slowly moving bodies. I will use
MR's, accessed via electrical resonators. Part of it will be in analogy to the previously studied macroscopic
systems, but with photons replaced by phonons. The experiments are done in a cryogenic temperature mostly
in dilution refrigerator. The work will open up new perspectives on how nature works, and can have
technological implications.

The first basic setup is the coupling of MR to microwave cavity resonators. This is a direct analogy to
optomechanics, and can be called circuit optomechanics. The goals will be phonon state transfer via a cavity
bus, construction of squeezed states and of phonon-cavity entanglement. The second setup is to boost the
optomechanical coupling with a Josephson junction system, and reach the single-phonon strong-coupling for
the first time. The third setup is the coupling of MR to a Josephson junction artificial atom. Here we will
access the MR same way as the motion of a trapped ions is coupled to their internal transitions. In this setup,
I am proposing to construct exotic quantum states of motion, and finally entangle and transfer phonons over
mm-distance via cavity-coupled qubits. I believe within the project it is possible to perform rudimentary Bell
measurement with phonons.

Champ scientifique

Régime de financement

ERC-CG - ERC Consolidator Grants

Institution d’accueil

AALTO KORKEAKOULUSAATIO SR

Contribution de l’UE

€ 2 004 283,00

Adresse

OTAKAARI 1
02150 Espoo
Finlande

Région

Manner-Suomi Helsinki-Uusimaa Helsinki-Uusimaa

Type d’activité

Higher or Secondary Education Establishments

Chercheur principal

Mika Antero Sillanpää (Prof.)

Contact administratif

Matti Kaivola (Prof.)

Liens

Contacter l’organisation Site web

Coût total

Aucune donnée

Bénéficiaires (1)