-------- Weitergeleitete Nachricht --------
Dear Members of Working Group WG2,
I would like to invite you to the next talk of our online seminar.
Date and time: Thursday, 19th of February 10am CET
Speaker: Torsten V. Zache (University of Innsbruck & IQOQI)
Title: Non-local mass superpositions and optical clock
interferometry in atomic ensemble quantum networks
Abstract:
Quantum networks are emerging as powerful platforms for sensing,
communication, and fundamental tests of physics. We propose a
programmable quantum sensing network based on entangled atomic
ensembles, where optical clock qubits emulate mass superpositions
in atom and atom-Clock interferometry. Our approach uniquely
combines scalability to large atom numbers with minimal control
requirements, relying only on collective addressing of internal
atomic states. This enables the creation of both non-local and
local superpositions with spatial separations beyond those
achievable in conventional interferometry. Starting from Bell-type
seed states distributed via photonic channels, collective
operations within atomic ensembles coherently build many-body mass
superpositions sensitive to gravitational redshift. The resulting
architecture realizes a non-local Ramsey interferometer, where
interference patterns arising from gravitationally induced phase
shifts can be observed through local measurements of network
nodes. Beyond extending the spatial reach of mass superpositions,
our scheme establishes a scalable, programmable platform to probe
the interface of quantum mechanics and gravity, and offers a new
experimental pathway to test atom and atom-clock interferometer
proposals in a network-based quantum laboratory.
The talk will be streamed via Zoom
https://uni-bremen.zoom-x.de/j/65971273542?pwd=4C1b7x87b1HbQ09hi5WXaKTOnetmDv.1
I am looking forward to seeing you for the talk and subsequent
discussions with Torsten Zache.
With kind regards,
Dennis (Rätzel)
University College London
WG2 leader