Entanglement of an array of massive, magnetically levitated superconducting microparticles on a chip

Introduction

Quantum states of massive objects have fascinated us since the inception of quantum mechanics. Nowadays, molecules of thousands of atoms and nanomechanical resonators weighing picograms can be brought into quantum states. This capability enables tests of the validity of quantum mechanics and provides new avenues for quantum technologies.

Importance of Entangled States

Entangled states are particularly relevant in this context as they unlock multipartite quantum correlations that, amongst others, enable precise measurements beyond the standard quantum limit and novel tests for the interplay between quantum mechanics and gravity.

Current Limitations

However, no experiment to date has demonstrated entanglement between a scalable number of massive particles, which would access a novel parameter regime in terms of mass, quantum correlation, and particle number.

Project Overview: SuperQLev

SuperQLev will fill this gap and demonstrate entanglement of the center-of-mass motion of an array of magnetically levitated superconducting microparticles on chip. This achievement will break new ground by exploring multipartite quantum states of massive objects ranging over six orders of magnitude in mass, from pico- to microgram.

Technological Innovations

SuperQLev will make this possible by merging two technologies into a unique experimental platform:

1. Magnetic Levitation of Superconducting Microparticles: This technology offers the capability of levitating massive particles at ultralow mechanical dissipation. My group has made pioneering contributions by realizing chip-based magnetic levitation of superconducting microparticles.

2. Superconducting Quantum Circuits: These circuits provide a versatile toolbox for quantum control.

Hybrid Quantum Platform

SuperQLev will merge these two platforms to achieve quantum control over the motion of levitated superconducting particles via inductive coupling to superconducting circuits. This hitherto unexplored hybrid quantum platform allows SuperQLev to conduct groundbreaking proof-of-principle experiments in quantum sensing and fundamental physics.