Probing non-classical light fields with energetic witnesses in Waveguide
Quantum Electro-Dynamics
- URL: http://arxiv.org/abs/2102.05941v2
- Date: Mon, 27 Sep 2021 15:47:21 GMT
- Title: Probing non-classical light fields with energetic witnesses in Waveguide
Quantum Electro-Dynamics
- Authors: Maria Maffei, Patrice A. Camati, Alexia Auff\`eves
- Abstract summary: We analyze energy exchanges between a qubit and a resonant field propagating in a waveguide.
Using the same definition for the field, we show that both work flows compensate each other.
- Score: 0.0
- License: http://creativecommons.org/licenses/by-nc-sa/4.0/
- Abstract: We analyze energy exchanges between a qubit and a resonant field propagating
in a waveguide. The joint dynamics is analytically solved within a repeated
interaction model. The work received by the qubit is defined as the unitary
component of the field-induced energy change. Using the same definition for the
field, we show that both work flows compensate each other. Focusing on the
charging of a qubit battery by a pulse of light, we evidence that the work
provided by a coherent field is an upper bound for the qubit ergotropy, while
this bound can be violated by non-classical fields, e.g. a coherent
superposition of zero- and single-photon states. Our results provide
operational, energy-based witnesses to probe the non-classical nature of a
light field.
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