Single-photon frequency conversion via a giant $\Lambda$-type atom
- URL: http://arxiv.org/abs/2104.11113v2
- Date: Mon, 30 Aug 2021 03:04:48 GMT
- Title: Single-photon frequency conversion via a giant $\Lambda$-type atom
- Authors: Lei Du and Yong Li
- Abstract summary: We study single-photon scattering via a giant $Lambda$-type atom, where both atomic transitions are coupled with the modes of a single waveguide at two separated points.
The giant-atom structure introduces phase-dependent interference effects to both elastic (frequency-preserving) and inelastic (frequency-converting) scattering processes.
- Score: 8.536452580320256
- License: http://creativecommons.org/licenses/by/4.0/
- Abstract: We study single-photon scattering via a giant $\Lambda$-type atom, where both
atomic transitions are coupled with the modes of a single waveguide at two
separated points. The giant-atom structure introduces phase-dependent
interference effects to both elastic (frequency-preserving) and inelastic
(frequency-converting) scattering processes, which modify the corresponding
decay rates (as well as the transition frequencies) such that the giant atom is
capable of accessing the various limits of a small one. The condition of the
optimal frequency conversion is also identified and shown to be phase
dependent. Moreover, we consider the combination of the giant-atom interference
and the Sagnac quantum interference by further inserting a Sagnac
interferometer at each of the coupling points. It is shown that the two kinds
of interference effects are compatible and play independent roles, such that
efficient frequency conversion with unit efficiency can be achieved in addition
to the phase-dependent phenomena induced by the giant-atom structure.
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