Frequency-resolved thermometry of baths in a non-equilibrium steady state shows that bath-state dispersion tracks the turnover of quantum heat current, with effective temperatures reverting to initial bath values in the strong-coupling limit.
Multi-cavity strong coupling to an electron spin ensemble: spectral and dark-state signatures
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abstract
Spin ensembles are considered as potential candidates for quantum memory and quantum enhanced sensing applications. Here, we explore the controlled coupling of multiple superconducting microwave cavities to a spin ensemble, which shows signatures of strong coupling and, due to the multi-mode character, the formation of dark states. In particular, the latter are of interest, as they provide a potential pathway to enhance memory times and enable protected storage of non-classical states in spin ensembles due to the suppressed coupling to the circuit environment. We model the spin multi-cavity hybrid to reproduce the spectra and extract characteristic coupling strengths using the input-output formalism.
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Probing Non-equilibrium baths: Frequency-Resolved Thermometry and Quantum Heat Current Turnover
Frequency-resolved thermometry of baths in a non-equilibrium steady state shows that bath-state dispersion tracks the turnover of quantum heat current, with effective temperatures reverting to initial bath values in the strong-coupling limit.