Challenges for Witnessing Quantum Aspects of
    Gravity in a Lab

June 7-11, 2021 (by videoconference)

The Zoom link will be posted here a few days before the event 

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.


Click here for online registration

Registration deadline: May 30, 2021


  • Nancy Aggarwal ( Northwestern University, USA )
  • 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 )
  • Chas Blakemore (Stanford University, USA): First search for new long range forces at the micron scale using optically levitated microspheres
  • 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)
  • Jan Harms ( Gran Sasso Institute, Italy )
  • Jack Harris ( Yale University, USA ): Measuring the higher-order phonon statistics in a nanogram volume of superfluid helium
  • Myungshik Kim ( Imperial College, UK ): Rotations at Quantum level
  • Timothy Kovachy ( Northwestern University, USA): Probing gravity nonlocally with macroscopically delocalized atom interferometers
  • Claus Laemmerzahl (University of Bremen, Germany)
  • 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
  • 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
  • Jacob Taylor ( NIST-Baltimore, USA )
  • 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)



Click here for online registration

Registration deadline: May 30, 2021



Workshop Program: PDF updated on May 14, 2021

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