Challenges for Witnessing Quantum Aspects of
    Gravity in a Lab

June 7-11, 2021 (by videoconference)

Zoom ID: 961 2842 0825

Password: gravity

Please send an e-mail to thiago AT, if you have any access problem.

CODE OF CONDUCT (Zoom protocol): click HERE

ICTP-SAIFR, São Paulo, Brazil



Understanding gravity in the framework of quantum mechanics is one of the significant challenges in modern physics. Along this line, a primary question is whether gravity is a quantum entity subject to quantum mechanical rules. Despite the purported weakness of gravity, the phase evolution induced by the gravitational interaction of two-micron size test masses in adjacent matter-wave interferometers can detectably entangle them via the exchange of graviton mediation even when they are placed far enough apart to keep Casimir-Polder forces at bay. This prescription for witnessing entanglement certifies gravity as a coherent quantum mediator through simple correlation measurements between two spins: one embedded in each test mass known as a QGEM (quantum gravity induced entanglement of masses) protocol. This workshop will discuss various theoretical and experimental challenges to conceive the QGEM protocol in a lab that will require an unprecedented level of accuracy in witnessing the quantum nature of one of nature’s weakest interactions.

There is no registration fee.


  • Nancy Aggarwal (Northwestern University, USA): Room temperature optomechanical squeezing
  • Markus Arndt (University of Vienna, Austria): Universal matter-wave interferometry: opportunity and challenges in probing quantum physics at the interface to gravity
  • Markus Aspelmeyer (University of Vienna, Austria): Gravitational coupling of microscopic source masses: challenges for future quantum Cavendish experiments
  • Peter Barker (University College London, UK):  Charged levitated nano-oscillators for testing macroscopic quantum mechanics
  • Chas Blakemore (Stanford University, USA): First search for new long range forces at the micron scale using optically levitated microspheres
  • Sougato Bose (University College London, UK): Quantum Nature of Gravity in the Lab: Assumptions, Implementation and Applications on the Way
  • Daniel Carney (Lawrence Berkley lab, USA): Theory implications from tabletop gravity experiments
  • N.D. Hari Dass (Institute of Mathematical Sciences – Chennai, India): Simple experiments to probe parity violation in Gravitation, and their theoretical implications
  • Brian D’ Urso (Montana University, USA ): Magneto-Gravitational Trapping of SiC Particles Containing Si-Vacancy Centers
  • Ron Folman ( Ben Gurion University, Israel ): Matter-wave interferometers on the atom chip
  • Gerald Gabriele (Northwestern University, USA): One-Particle Quantum Cyclotron
  • Andrew Geraci (Northwestern University, USA): Looking for “fifth forces”, dark matter, and quantum gravity with optomechanical sensors
  • Jan Harms (Gran Sasso Institute, Italy): Terrestrial gravity fluctuations in GW detectors
  • Jack Harris ( Yale University, USA ): Measuring the higher-order phonon statistics in a nanogram volume of superfluid helium
  • Timothy Kovachy ( Northwestern University, USA): Probing gravity nonlocally with macroscopically delocalized atom interferometers
  • Claus Laemmerzahl (University of Bremen, Germany): Effects of space-time fluctuations on quantum systems
  • Tongcang Li  (Purdue University, USA): Ultrasensitive torque detection with an optically levitated nanoparticle
  • Yair Margalit ( MIT, USA ): Towards testing quantum gravity using the full-loop Stern-Gerlach interferometer
  • Ryan Marshman ( University College London, UK ): The design and use of Stern-Gerlach interferometry for Gravitational Experiments
  • Samir Mathur (Ohio State University, USA): Contrasting the fuzzball and wormhole paradigms for resolving the black hole information paradox
  • Anupam Mazumdar (University of Groningen, The Netherlands): Quantum test of Gravity by colliding Schrödinger’s kittens
  • David Moore ( Yale University, USA ): Progress towards the quantum measurement regime with optically levitated nanogram-scale masses
  • Gavin Morley ( Warwick University, UK ): Levitating nanodiamond experiments towards a test of quantum gravity
  • Cristian Panda (Berkley, USA): Probing the interplay of quantum mechanics and gravity using a trapped atom interferometer
  • Maulik Parikh (Arizona State University, USA): The Noise of Gravitons
  • Igor Pikovski (Stockholm University, Sweden): Quantum optics at the interface with gravity
  • Martin Plenio (University of Ulm, Germany): Towards Robust Interferometry with Massive Particles
  • Simone Rijavec (University of Oxford): Decoherence effects in non-classicality tests of gravity
  • Carlo RovelliAix-Marseille University, France ): What do the Gravitational Entanglement Lab Experiments Teach us about Quantum Spacetime
  • Benjamin Stickler (University of Duisburg-Essen, Germany): Quantum rotations of nanoparticles
  • Jacob Taylor (NIST-Baltimore, USA): Quantum information-driven tests of gravitationally-mediated entanglement
  • Marko Toros ( University of Glasgow, UK): Relative Acceleration Noise Mitigation for Nanocrystal Matter-wave Interferometry: Application to Entangling Masses via Quantum Gravity
  • Hendrik Ulbricht (University of Southampton, UK): Probing gravity of quantum systems in the paradigm of levitated mechanics
  • Vlatko Vedral ( Oxford University, UK ): Different degrees of reliability of lab-based tests of quantum aspects of gravity
  • Kathryn Zurek (Caltech, USA): Observational consequences of quantum gravity in interferometers


  • Sougato Bose (University College London, UK)
  • Andrew Geraci ( Northwestern University, USA)
  • Anupam Mazumdar (University of Groningen, The Netherlands)



Online Registration is now closed


Workshop Program (CEST Time) :PDF updated on June 9, 2021

Workshop Program (BRT Time) : PDF updated on June 9, 2021

List of Abstracts: PDF updated on June 9, 2021


Videos & Files

2021-06-07 2021-06-08 2021-06-09 2021-06-10 2021-06-11



Additional Information