4 papers
Mutual Information Bounded by Fisher Information
Wojciech Górecki, Xi Lu, Chiara Macchiavello +1
We derive a general upper bound to mutual information in terms of the Fisher information. The bound may be further used to derive a lower bound for the Bayesian quadratic cost. The…
Number of bits returned by a quantum estimation
Xi Lu, Wojciech Górecki, Chiara Macchiavello +1
We give two upper bounds to the mutual information in arbitrary quantum estimation strategies. The first is based on some simple Fourier properties of the estimation apparatus. The…
Quantum-enhanced dark matter detection with in-cavity control: mitigating the Rayleigh curse
Haowei Shi, Anthony J. Brady, Wojciech Górecki +3
The nature of dark matter is a fundamental puzzle in modern physics. A major approach of searching for dark matter relies on detecting feeble noise in microwave cavities. However,…
Optimality and Noise-Resilience of Critical Quantum Sensing
Uesli Alushi, Wojciech Górecki, Simone Felicetti +1
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 uni…