High-Power Collective Charging of a Solid-State Quantum Battery

Quantum information theorems state that it is possible to exploit collective quantum resources to greatly enhance the charging power of quantum batteries (QBs) made of many identical elementary units. We here present and solve a model of a QB that can be engineered in solid-state architectures. It c...

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Bibliographic Details
Published in:Physical review letters 2018-03, Vol.120 (11), p.117702-117702, Article 117702
Main Authors: Ferraro, Dario, Campisi, Michele, Andolina, Gian Marcello, Pellegrini, Vittorio, Polini, Marco
Format: Article
Language:English
Subjects:
Batteries
Charging
Photonics
Quantum entanglement
Quantum phenomena
Solid state
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Summary:Quantum information theorems state that it is possible to exploit collective quantum resources to greatly enhance the charging power of quantum batteries (QBs) made of many identical elementary units. We here present and solve a model of a QB that can be engineered in solid-state architectures. It consists of N two-level systems coupled to a single photonic mode in a cavity. We contrast this collective model ("Dicke QB"), whereby entanglement is genuinely created by the common photonic mode, to the one in which each two-level system is coupled to its own separate cavity mode ("Rabi QB"). By employing exact diagonalization, we demonstrate the emergence of a quantum advantage in the charging power of Dicke QBs, which scales like sqrt[N] for N≫1.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.120.117702