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Spin-chain model of a many-body quantum battery
Thao P. Le, Jesper Levinsen, Kavan Modi +2
Recently, it has been shown that energy can be deposited on a collection of quantum systems at a rate that scales super-extensively. Some of these schemes for `quantum batteries' r…
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…
Kolmogorov extension theorem for (quantum) causal modelling and general probabilistic theories
Simon Milz, Fattah Sakuldee, Felix A. Pollock +1
In classical physics, the Kolmogorov extension theorem lays the foundation for the theory of stochastic processes. It has been known for a long time that, in its original form, thi…
Entanglement, non-Markovianity, and causal non-separability
Simon Milz, Felix A. Pollock, Thao P. Le +2
Quantum mechanics, in principle, allows for processes with indefinite causal order. However, most of these causal anomalies have not yet been detected experimentally. We show that…
Tightening Quantum Speed Limits for Almost All States
Francesco Campaioli, Felix A. Pollock, Felix C. Binder +1
Conventional quantum speed limits perform poorly for mixed quantum states: They are generally not tight and often significantly underestimate the fastest possible evolution speed.…