Sensors operating at exceptional points: General theory

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Hybrid-Liouvillian formalism connecting exceptional points of non-Hermitian Hamiltonians and Liouvillians via postselection of quantum trajectories (2020, background): “The advantages of EPs for applications remain a very active topic of research [16, 61–74] and correctly modeling noise and quantum jumps is fundamental to correctly address the question of, e.”
Sensitivity of parameter estimation near the exceptional point of a non-Hermitian system (2018, methodology): “Based on this divergence, schemes of parameter estimation (or sensing) working around EPs were proposed for the purpose of beating the metrology limit of Hermitian systems [29, 30].”
Quantum exceptional points of non-Hermitian Hamiltonians and Liouvillians: The effects of quantum jumps (2019, background): “[54, 65–68] and observed experimentally in Refs.”
Generalized parity–time symmetry condition for enhanced sensor telemetry (2018, background): “The exceptional points arising in these systems, found at the bifurcations of eigenfrequencies near the PT -phase transition, show potential to enhance the sensitivity of photonic sensors [31]-[35].”