Macroscopic quantum resonators (MAQRO): 2015 Update
Rainer Kaltenbaek, Markus Arndt, Markus Aspelmeyer, Peter F. Barker,, Angelo Bassi, James Bateman, Kai Bongs, Sougato Bose, Claus Braxmaier,, \v{C}aslav Brukner, Bruno Christophe, Michael Chwalla, Pierre-Fran\c{c}ois, Cohadon, Adrian M. Cruise, Catalina Curceanu, Kishan Dholakia

TL;DR
MAQRO aims to test the limits of quantum physics for macroscopic objects using space-based experiments, potentially revealing new insights into the quantum-classical transition and the role of gravity.
Contribution
This paper proposes a space mission, MAQRO, leveraging recent quantum optomechanics and space tech to explore macroscopic quantum phenomena beyond ground-based capabilities.
Findings
Design concept for MAQRO mission submitted to ESA
Potential to test quantum theory at unprecedented mass scales
Addresses fundamental questions about quantum mechanics and gravity
Abstract
Do the laws of quantum physics still hold for macroscopic objects - this is at the heart of Schr\"odinger's cat paradox - or do gravitation or yet unknown effects set a limit for massive particles? What is the fundamental relation between quantum physics and gravity? Ground-based experiments addressing these questions may soon face limitations due to limited free-fall times and the quality of vacuum and microgravity. The proposed mission MAQRO may overcome these limitations and allow addressing those fundamental questions. MAQRO harnesses recent developments in quantum optomechanics, high-mass matter-wave interferometry as well as state-of-the-art space technology to push macroscopic quantum experiments towards their ultimate performance limits and to open new horizons for applying quantum technology in space. The main scientific goal of MAQRO is to probe the vastly unexplored…
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