Optimality and Noise-Resilience of Critical Quantum Sensing
Optimality and Noise-Resilience of Critical Quantum Sensing
We compare critical quantum sensing to passive quantum strategies to perform frequency estimation, in the case of single-mode quadratic Hamiltonians. We show that, while in the unitary case both strategies achieve precision scaling quadratic with the number of photons, in the presence of dissipation this is true only for critical …