Life and death of the Bose polaron
Magnus G. Skou, Kristian Knakkergaard Nielsen, Thomas G. Skov, Andreas, M. Morgen, Nils B. J{\o}rgensen, Arturo Camacho-Guardian, Thomas Pohl, Georg, M. Bruun, Jan J. Arlt

TL;DR
This paper compares spectroscopic and interferometric methods to study the Bose polaron, revealing insights into its dynamical regimes, coherence, and energy properties, and demonstrating the effectiveness of interferometry in resolving polaron dynamics.
Contribution
It provides a comprehensive comparison of interferometric and spectroscopic techniques for analyzing Bose polarons, highlighting interferometry's ability to resolve fast quantum dynamics and measure polaron energies.
Findings
Interferometry reveals faster quantum dynamics at strong repulsive interactions.
Polaron energy measured via interferometry agrees with spectroscopic results.
Phase evolution indicates rapid initial formation of polarons.
Abstract
Spectroscopic and interferometric measurements complement each other in extracting the fundamental properties of quantum many-body systems. While spectroscopy provides precise measurements of equilibrated energies, interferometry can elucidate the dynamical evolution of the system. For an impurity immersed in a bosonic medium, both are equally important for understanding the quasiparticle physics of the Bose polaron. Here, we compare the interferometric and spectroscopic timescales to the underlying dynamical regimes of the impurity dynamics and the polaron lifetime, highlighting the capability of the interferometric approach to clearly resolve polaron dynamics. In particular, interferometric measurements of the coherence amplitude at strong interactions reveal faster quantum dynamics at large repulsive interaction strengths than at unitarity. These observations are in excellent…
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Taxonomy
TopicsCold Atom Physics and Bose-Einstein Condensates · Strong Light-Matter Interactions · Quantum Information and Cryptography
