9 papers
Exact requirements for battery-assisted qubit gates
Riccardo Castellano, Vasco Cavina, Martà Perarnau-Llobet +2
We consider the implementation of a unitary gate on a qubit system S via a global energy-preserving operation acting on S and an auxiliary system B that can be seen as a battery. W…
Quantum sensing of a quantum field
Ricard Ravell RodrÃguez, Martà Perarnau-Llobet, Pavel Sekatski
Estimating a classical parameter encoded in the Hamiltonian of a quantum probe is a fundamental and well-understood task in quantum metrology. A textbook example is the estimation…
Cloning Quantum Channels
Pavel Sekatski, Yelena Guryanova, Naga Bhavya Teja Kothakonda +1
We consider the problem of deterministically cloning quantum channels with respect to the best attainable rate and the highest quality, so-called optimal cloning. We demonstrate th…
The entropic coherence is a necessary resource for non-energy preserving gates
Riccardo Castellano, Vasco Cavina, Marti Perarnau-Llobet +2
We consider the task of implementing non-energy preserving gates (NEPG) on a finite-dimensional system S via an energy-preserving interaction with an external battery B. We prove t…
On the entropy growth of sums of iid discrete random variables
Riccardo Castellano, Pavel Sekatski
We derive an asymptotic lower bound on the Shannon entropy of sums of arbitrary iid discrete random variables. The derived bound …
From dynamical to steady-state many-body metrology: Precision limits and their attainability with two-body interactions
Ricard Puig, Pavel Sekatski, Paolo Andrea Erdman +3
We consider the estimation of an unknown parameter via a many-body probe. The probe is initially prepared in a product state and many-body time-independent interactions enhanc…