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Quantum versus classical many-body batteries
Gian Marcello Andolina, Maximilian Keck, Andrea Mari +2
Quantum batteries are quantum mechanical systems with many degrees of freedom which can be used to store energy and that display fast charging. The physics behind fast charging is…
Maximum power and corresponding efficiency for two-level heat engines and refrigerators: optimality of fast cycles
Paolo Andrea Erdman, Vasco Cavina, Rosario Fazio +2
We study how to achieve the ultimate power in the simplest, yet non trivial, model of a thermal machine, namely a two-level quantum system coupled to two thermal baths. Without mak…
Optimal Quantum Subtracting Machine
Farzad Kianvash, Marco Fanizza, Vittorio Giovannetti
The impossibility of undoing a mixing process is analysed in the context of quantum information theory. The optimal machine to undo the mixing process is studied in the case of pur…
Two-parameter Hong-Ou-Mandel dip
Yu Yang, Luping Xu, Vittorio Giovannetti
A modification of the standard Hong-Ou-Mandel interferometer is proposed which allows one to replicate the celebrated coincidence dip in the case of two-independent delay parameter…
Entanglement Protection via Periodic Environment Resetting in Continuous Time Quantum Dynamical Processes
Thomas Bullock, Francesco Cosco, Marwan Haddara +8
The temporal evolution of entanglement between a noisy system and an ancillary system is analyzed in the context of continuous time open quantum system dynamics. Focusing on a coup…
All-optical implementation of collision-based evolutions of open quantum systems
Álvaro Cuevas, Andrea Geraldi, Carlo Liorni +5
We present a new optical scheme enabling the implementation of highly stable and configurable non-Markovian dynamics. Here one photon qubit can circulate in a multipass bulk geomet…
A dynamical approach to ancilla assisted quantum thermometry
Alexander Holm Kiilerich, Antonella De Pasquale, Vittorio Giovannetti
A scheme for improving the sensitivity of quantum thermometry is proposed where the sensing quantum system used to recover the temperature of an external bath is dynamically couple…
Extractable work, the role of correlations, and asymptotic freedom in quantum batteries
Gian Marcello Andolina, Maximilian Keck, Andrea Mari +3
We investigate a quantum battery made of N two-level systems, which is charged by an optical mode via an energy-conserving interaction. We quantify the fraction E(N) of energy stor…
Variational approach to the optimal control of coherently driven, open quantum system dynamics
Vasco Cavina, Andrea Mari, Alberto Carlini +1
Quantum coherence inherently affects the dynamics and the performances of a quantum machine. Coherent control can, at least in principle, enhance the work extraction and boost the…
Entropy production and asymptotic factorization via thermalization: a collisional model approach
Stefano Cusumano, Vasco Cavina, Maximilian Keck +2
The Markovian evolution of an open quantum system is characterized by a positive entropy production, while the global entropy gets redistributed between the system and the environm…
Charger-mediated energy transfer in exactly-solvable models for quantum batteries
Gian Marcello Andolina, Donato Farina, Andrea Mari +3
We present a systematic analysis and classification of several models of quantum batteries involving different combinations of two level systems and quantum harmonic oscillators. I…
Bridging thermodynamics and metrology in non-equilibrium Quantum Thermometry
Vasco Cavina, Luca Mancino, Antonella De Pasquale +7
Single-qubit thermometry presents the simplest tool to measure the temperature of thermal baths with reduced invasivity. At thermal equilibrium, the temperature uncertainty is link…
Degradation of Entanglement in Markovian Noise
Dario Gatto, Antonella De Pasquale, Vittorio Giovannetti
The entanglement survival time is defined as the maximum time a system which is evolving under the action of local Markovian, homogenous in time noise, is capable to preserve the e…
Optimal universal learning machines for quantum state discrimination
Marco Fanizza, Andrea Mari, Vittorio Giovannetti
We consider the problem of correctly classifying a given quantum two-level system (qubit) which is known to be in one of two equally probable quantum states. We assume that this ta…
Optimal Gaussian Metrology for Generic Multimode Interferometric Circuit
Teruo Matsubara, Paolo Facchi, Vittorio Giovannetti +1
Bounds on the ultimate precision attainable in the estimation of a parameter in Gaussian quantum metrology are obtained when the average number of bosonic probes is fixed. We ident…
Geometrical bounds on irreversibility in open quantum systems
Luca Mancino, Vasco Cavina, Antonella De Pasquale +6
Clausius inequality has deep implications for reversibility and the arrow of time. Quantum theory is able to extend this result for closed systems by inspecting the trajectory of t…
Asymmetric information capacities of reciprocal pairs of quantum channels
Matteo Rosati, Vittorio Giovannetti
Reciprocal pairs of quantum channels are defined as completely positive transformations which admit a rigid, distance-preserving, yet not completely-positive transformation that al…
Narrow Bounds for the Quantum Capacity of Thermal Attenuators
Matteo Rosati, Andrea Mari, Vittorio Giovannetti
Thermal attenuator channels model the decoherence of quantum systems interacting with a thermal bath, e.g., a two-level system subject to thermal noise and an electromagnetic signa…