Colloquium: Quantum enhanced sensing of a spatially extended field

Nonlocal correlations that exist in quantum physics can be used in a sensor network to improve the sensitivity of the measurement of an extended field or some of its spatial features. Taking an atomic ensemble in a spin-squeezed state distributed in different spatial modes (the sensors) as a resource, I will show what kind of gain can be obtained in two different cases. First, assuming that local manipulations can be made on the sensors but all measurements are collective [1], and second, including some experimental results [2], assuming that both local manipulations and local measurements are possible on each sensor. Generalising to the case of a large number of sensors, we show applications to imaging and compressed sensing.

References :
[1] „Quantum-enhanced multiparameter estimation and compressed sensing of a field“, Y. Baamara, M. Gessner, A. Sinatra, SciPost Physics 14, 050 (2023) https://scipost.org/SciPostPhys.14.3.050
[2] „Multiparameter estimation with an array of entangled atomic sensors“, Yifan Li, Lex Joosten, Youcef Baamara, Paolo Colciaghi, Alice Sinatra, Philipp Treutlein, Tilman Zibold, https://arxiv.org/abs/2504.08677.

Access data for the transfer:
Zoom Access: https://us04web.zoom.us/j/932734874

This talk is part of the „Virtual Seminar on Precision Physics and Fundamental Symmetries“ series and of the SFB DQ-mat colloquium series: https://indico.cern.ch/category/12183/