Off-resonant Dicke Quantum Battery: Charging by Virtual Photons
- URL: http://arxiv.org/abs/2302.13624v1
- Date: Mon, 27 Feb 2023 09:47:41 GMT
- Title: Off-resonant Dicke Quantum Battery: Charging by Virtual Photons
- Authors: Giulia Gemme, Gian Marcello Andolina, Francesco Maria Dimitri
Pellegrino, Maura Sassetti, Dario Ferraro
- Abstract summary: We investigate a Dicke quantum battery in the dispersive regime, where the photons trapped into a resonant cavity are way more energetic with respect to the two-level systems embedded into it.
Under such off-resonant conditions, even an empty cavity can lead to the charging of the quantum battery through a proper modulation of the matter-radiation coupling.
- Score: 0.0
- License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
- Abstract: We investigate a Dicke quantum battery in the dispersive regime, where the
photons trapped into a resonant cavity are way more energetic with respect to
the two-level systems embedded into it. Under such off-resonant conditions,
even an empty cavity can lead to the charging of the quantum battery through a
proper modulation of the matter-radiation coupling. This counterintuitive
behaviour has its roots in the effective interaction between two-level systems
mediated by virtual photons emerging from the fluctuations of the quantum
electromagnetic field. In order to properly characterize it, we address
relevant figures of merit such as the stored energy, the time required to reach
the maximum charging, and the averaged charging power. Moreover, the
possibility of efficiently extracting energy in various ranges of parameters is
discussed. The scaling of stored energy and power as a function of the number
$N$ of two-level systems and for different values of the matter-radiation
coupling is also discussed showing, in the strong coupling regime, performances
in line with what reported for the Dicke quantum battery in the resonant
regime.
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