Abstract
We study superradiant phase-transition (SPT) phenomena for high-precision quantum thermometry applications. Comprehensive thermodynamic properties of quantum thermosensor have been elucidated. Such thermosensor exploits two distinguishable thermodynamic (collective) states of N inhomogeneously broadened two-level quantum systems (TLSs) interacting with a quantized electromagnetic field in the cavity. Field amplitude (cavity photon number) represents the order parameter and exhibits the second order phase-transition. We fully describe two types of exciton-polaritons being close to normal state, which can be used for initialization of operating regimes in temperature sensorics. Temperature sensitivity and accuracy are analyzed in the framework of quantum estimation theory. Scaling for standard quantum limit (SQL), up to Heisenberg limit for temperature estimation, has been predicted. Temperature accuracy estimation up to mK’s and beyond can be achieved with use of phase-transition with a lower branch exciton-polaritons. It can be obtained with currently available narrow band semiconductor microstructures placed in microcavities with high Q-factor.
Published Version
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