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Q: Fachverband Quantenoptik und Photonik
Q 19: Quantum Optics II
Q 19.2: Vortrag
Dienstag, 10. März 2020, 14:30–14:45, f342
Dynamical phase transitions in a chiral spin chain — •Giuseppe Buonaiuto1,2, Ryan Jones1,2, Beatriz Olmos1,2, and Igor Lesanovsky1,2 — 1Institut für Theoretische Physik, Auf der Morgenstelle 14, Universität Tübingen, D-72076 Tübingen, Germany — 2School of Physics School of Physics and Astronomy, University of Nottingham, Nottingham NG7 2RD, United Kingdom
Open quantum systems with chiral interactions can be realized by coupling atoms to guided radiation modes to waveguides. In their steady state these systems can feature intricate many-body phases such as entangled dark states, but their detection and characterization remains a challenge. We show that the counting statistics of the photons emitted into the waveguide provides a means to detect and characterize the many-body state of a chiral atom chain. Our approach [1] exploits that the guided photons do not only induce interactions between the emitters, but also carry information about their quantum state. This perspective allows to probe intricate dynamical phenomena such as transitions and the coexistence between dynamical phases. In the latter case, entangled states may occur as fluctuations in an intermittent dynamics and are heralded through characteristic features of the time-resolved photon count signal. Our approach also permits to systematically assess the effect of inevitable imperfections, such as the emission of photons into unguided modes
[1]G. Buonaiuto et al., Dynamical creation and detection of entangled many-body states in a chiral atom chain, N. J. P., 21, 11, 2019