Gravity and Entanglement

7 Oct 2024, 14:00 → 9 Oct 2024, 14:00 Europe/Berlin

Bldg. 90, ZOQ (DESY Hamburg)

This workshop brings together theorists interested in quantum tests of gravity and experimenters working on gravitational wave detection, CMB and quantum optics. The main topics are:

• Gravitational entanglement in the Lab
• Gravitational entanglement in the CMB
• Quantum gravity background in GW detectors

 

The goal of the workshop is to present new ideas and to stimulate discussions across the different research areas.

 

Invited speakers include

• Markus Aspelmeyer (Vienna)
• Daniel Carney (Berkeley) 
• Georgi Dvali (Munich)
• Mikhail Korobko (Hamburg)
• Stefano Lanza (Hamburg)
• Guilherme Pimentel (Pisa)
• Rafael Porto (DESY)
• Margherita Putti (Hamburg)
• Serge Reynaud (Paris)
• Guglielmo Tino (LENS)
• Eric Verlinde (Amsterdam)
• Philip Walther (Vienna)
• Alexander Westphal (DESY)

 

Organizing committee

Markus Aspelmeyer, Wilfried Buchmüller, Georgi Dvali, Jan Louis, Roman Schnabel.

 

EntangledGravityConfPoster24_Arial.pdf

Group_Photo_241007.jpeg

Liste_Hotelkontingente_more.docx

View_from_Skybar_241008.jpeg

Monday 7 October

Registration, welcome

Gravitational entanglement in the Lab I

Convener: CHAIR: R. Schnabel

Review on experiments: superposition of massive systems

Convener: M. Aspelmeyer

Talk_Aspelmeyer.pdf

15:30 Coffee break

Entangled photons in the Earth's gravitational field

In the past decades, interferometry using quantum systems has emerged as a crucial tool for achieving ultrasensitive measurements. This development is not only interesting for exploiting quantum physics properties to enhance classical interferometers, but also for opening up the investigation of fundamental effects on quantum systems in the laboratory. A prominent example is the open question of how gravity alters quantum entanglement, whose answer would shine new light into the interplay of general relativity and quantum physics. For enabling such experiments quantum interferometers with unprecedented sensitivity will be needed.
Within this talk I will present a major step towards this possibility by demonstrating a high-precision Sagnac quantum optical interferometer that is capable of measuring Earth’s rotation. By exploiting maximally path-entangled two-photon states, we observe super-resolution of the rotation signal and achieve a rotation rate sensitivity of 5 μrad/s. This establishes a world record in the rotation sensitivity of quantum optical interferometers and surpasses the current state-of-the-art resolution by three orders of magnitude.
As outlook I will present our ongoing experimental research aiming to explore the interface between quantum mechanics and general relativity by performing high-precision experiments using entangled photon states as probe. For this purpose, a high-precision interferometer whose paths are subject to different gravitational potentials will be used.

Convener: P. Walther

Talk_Walther.pdf

Probing gravity with atomic matter waves

I will describe recent experiments and future prospects for precision tests of gravitational physics using new quantum devices based on ultracold atoms, namely, atom interferometers and optical clocks.

Convener: G. Tino

Talk_Tino.pdf

Reception

Tuesday 8 October

Gravitational entanglement in the CMB

Convener: CHAIR: W. Buchmüller

Cosmological correlators

Convener: G. Pimentel

Cosmological Correlators - Guilherme L. Pimentel.pdf

10:00 Coffee break

Signales of the quantum universe

Convener: R. Porto

Talk_Porto.png

Maldacena's model with cosmological Bell inequalities

Convener: S. Lanza, M. Putti

Cosmological_Bell_Inequalities.pdf

12:30 Lunch

Gravitational entanglemet in the Lab II

Convener: CHAIR: K. Danzmann

Quantized states of matter in the gravitational field - ultra-cold neutrons

Convener: A. Westphal

Westphal_UCN_gravitational_quantum_states.pdf

15:00 Coffee break

Entangled photon pairs, quantum events and the equivalence principle

Convener: S. Reynaud

Talk_Reynaud.pdf

Short distance modifications of gravity

Convener: G. Dvali

Talk_Dvali.pdf

Wednesday 9 October

Quantum gravity background in GW detectors

Convener: CHAIR: J. Louis

QG background in GW detectors (AdS/CFT)

Convener: E. Verlinde

Talk_Verlinde.pdf

10:00 Coffee break

Probing QG background in GW detectors

Convener: M. Korobko

Talk_Korobko.pdf

Comments on some `non-quantum' models of gravity

Convener: D. Carney

2024 - desy testing gravity.pdf

12:30 Lunch