Spectral filtering induced by non-hermitian evolution with balanced gain and loss: Enhancing quantum chaos

J Cornelius, Z Xu, A Saxena, A Chenu, A Del Campo - Physical Review Letters, 2022 - APS
The dynamical signatures of quantum chaos in an isolated system are captured by the
spectral form factor, which exhibits as a function of time a dip, a ramp, and a plateau, with the …

In Situ Thermometry of a Cold Fermi Gas via Dephasing Impurities

MT Mitchison, T Fogarty, G Guarnieri, S Campbell… - Physical Review Letters, 2020 - APS
The precise measurement of low temperatures is a challenging, important, and fundamental
task for quantum science. In particular, in situ thermometry is highly desirable for cold atomic …

Thermometry of strongly correlated fermionic quantum systems using impurity probes

G Mihailescu, S Campbell, AK Mitchell - Physical Review A, 2023 - APS
We study quantum-impurity models as a platform for quantum thermometry. A single
quantum spin-1 2 impurity is coupled to an explicit, structured, fermionic thermal sample …

Single-atom quantum probes for ultracold gases boosted by nonequilibrium spin dynamics

Q Bouton, J Nettersheim, D Adam, F Schmidt, D Mayer… - Physical Review X, 2020 - APS
Quantum probes are atomic sized devices map** information of their environment to
quantum-mechanical states. By improving measurements and at the same time minimizing …

Speed-ups to isothermality: Enhanced quantum thermal machines through control of the system-bath coupling

N Pancotti, M Scandi, MT Mitchison, M Perarnau-Llobet - Physical Review X, 2020 - APS
Isothermal transformations are minimally dissipative but slow processes, as the system
needs to remain close to thermal equilibrium along the protocol. Here, we show that …

Quantum sensing of temperature close to absolute zero in a Bose-Einstein condensate

JB Yuan, B Zhang, YJ Song, SQ Tang, XW Wang… - Physical Review A, 2023 - APS
We propose a theoretical scheme for quantum sensing of temperature close to absolute zero
in a quasi-one-dimensional Bose-Einstein condensate (BEC). In our scheme, a single-atom …

Controlling Rydberg atom excitations in dense background gases

TC Liebisch, M Schlagmüller, F Engel… - Journal of Physics B …, 2016 - iopscience.iop.org
We discuss the density shift and broadening of Rydberg spectra measured in cold, dense
atom clouds in the context of Rydberg atom spectroscopy done at room temperature, dating …

Criticality-enhanced precision in phase thermometry

M Yu, HC Nguyen, S Nimmrichter - Physical Review Research, 2024 - APS
Temperature estimation of interacting quantum many-body systems is both a challenging
task and topic of interest in quantum metrology, given that critical behavior at phase …

Coherent and dephasing spectroscopy for single-impurity probing of an ultracold bath

D Adam, Q Bouton, J Nettersheim, S Burgardt… - Physical Review Letters, 2022 - APS
We report Ramsey spectroscopy on the clock states of individual Cs impurities immersed in
an ultracold Rb bath. We record both the interaction-driven phase evolution and the decay of …

Quantum spin dynamics of individual neutral impurities coupled to a Bose-Einstein condensate

F Schmidt, D Mayer, Q Bouton, D Adam, T Lausch… - Physical Review Letters, 2018 - APS
We report on spin dynamics of individual, localized neutral impurities immersed in a Bose-
Einstein condensate. Single cesium atoms are transported into a cloud of rubidium atoms …