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33 papers · 2 filters
Energy-efficient quantum frequency estimation
Pietro Liuzzo-Scorpo, Luis A. Correa, Felix A. Pollock +3
The problem of estimating the frequency of a two-level atom in a noisy environment is studied. Our interest is to minimise both the energetic cost of the protocol and the statistic…
Noisy frequency estimation with noisy probes
Agnieszka Górecka, Felix A. Pollock, Pietro Liuzzo-Scorpo +3
We consider frequency estimation in a noisy environment with noisy probes. This builds on previous studies, most of which assume that the initial probe state is pure, while the enc…
Probing the temperature of cold many-body quantum systems
Karen V. Hovhannisyan, Luis A. Correa
It is "conventional wisdom" that the uncertainty of local temperature measurements on equilibrium systems diverges exponentially fast as their temperature drops to zero. In con…
One-shot coherence distillation
Bartosz Regula, Kun Fang, Xin Wang +1
We characterize the distillation of quantum coherence in the one-shot setting, that is, the conversion of general quantum states into maximally coherent states under different clas…
Multiparameter Gaussian Quantum Metrology
Rosanna Nichols, Pietro Liuzzo-Scorpo, Paul A. Knott +1
We investigate the ultimate precision achievable in Gaussian quantum metrology. We derive general analytical expressions for the quantum Fisher information matrix and for the measu…
Minimax estimation of qubit states with Bures risk
Anirudh Acharya, Madalin Guta
The central problem of quantum statistics is to devise measurement schemes for the estimation of an unknown state, given an ensemble of independent identically prepared systems…