Correlated Noise Estimation with Quantum Sensor Networks

Understand

We address the metrological problem of estimating collective stochastic properties imprinted on a network of quantum sensors.

• Canonical examples include center-of-mass quadrature fluctuations in a system of bosonic modes and correlated dephasing in an ensemble of qubits (e.g., spins), bosons, or fermions.
• We develop a theoretical framework to determine the limits of correlated (weak) noise estimation with quantum sensor networks and reveal the requirements for entanglement advantage.
• Notably, an advantage emerges from the synergistic interplay between quantum correlations of the sensors and ``classical'' correlations of the noises.