Light-matter quantum interface with continuous pump and probe

authored by: Alexander Roth, Klemens Hammerer, Kirill S. Tikhonov
Abstract: Spin-polarized atomic ensembles probed by light based on the Faraday interaction are a versatile platform for numerous applications in quantum metrology and quantum information processing. Here we consider an ensemble of Alkali atoms that are continuously optically pumped and probed. Due to the collective scattering of photons at large optical depth, the steady state of atoms does not correspond to an uncorrelated tensor-product state, as is usually assumed. We introduce a self-consistent method to approximate the steady state including the pair correlations, taking into account the multilevel structure of atoms. We find and characterize regimes of Raman lasing, akin to the model of a superradiant laser. We determine the spectrum of the collectively scattered photons, which also characterizes the coherence time of the collective spin excitations on top of the stationary correlated mean-field state, as relevant for applications in metrology and quantum information.
Organisation(s): Institute of Theoretical Physics
CRC 1227 Designed Quantum States of Matter (DQ-mat)
External Organisation(s): Saint Petersburg State University
Type: Article
Journal: Journal of Physics B: Atomic, Molecular and Optical Physics
Volume: 56
ISSN: 0953-4075
Publication date: 15.02.2023
Publication status: Published
Peer reviewed: Yes
ASJC Scopus subject areas: Atomic and Molecular Physics, and Optics, Condensed Matter Physics
Electronic version(s): https://doi.org/10.1088/1361-6455/acb6db (Access: Open)

BibTeX

@article{8d0e45bbdb484e54aa060779c9fa0669,
title = "Light-matter quantum interface with continuous pump and probe",
abstract = "Spin-polarized atomic ensembles probed by light based on the Faraday interaction are a versatile platform for numerous applications in quantum metrology and quantum information processing. Here we consider an ensemble of Alkali atoms that are continuously optically pumped and probed. Due to the collective scattering of photons at large optical depth, the steady state of atoms does not correspond to an uncorrelated tensor-product state, as is usually assumed. We introduce a self-consistent method to approximate the steady state including the pair correlations, taking into account the multilevel structure of atoms. We find and characterize regimes of Raman lasing, akin to the model of a superradiant laser. We determine the spectrum of the collectively scattered photons, which also characterizes the coherence time of the collective spin excitations on top of the stationary correlated mean-field state, as relevant for applications in metrology and quantum information.",
keywords = "atomic ensemble, collective scattering, cumulant expansion, Faraday interaction, quantum nondemolition, Raman lasing, superradiant laser",
author = "Alexander Roth and Klemens Hammerer and Tikhonov, {Kirill S.}",
note = "Funding Information: We thank Eugene Polzik and Philipp Treutlein for discussions. K H acknowledges support from Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) under Germany{\textquoteright}s Excellence Strategy—EXC-2123 QuantumFrontiers—390837967, and Project-ID 274200144—SFB 1227 (DQ-mat, Project A06) through which the results in sections , and were obtained. K T acknowledges financial support of the Russian Science Foundation (Project No. 21-72-00049) through which the results in sections and were obtained. ",
year = "2023",
month = feb,
day = "15",
doi = "10.1088/1361-6455/acb6db",
language = "English",
volume = "56",
journal = "Journal of Physics B: Atomic, Molecular and Optical Physics",
issn = "0953-4075",
publisher = "IOP Publishing Ltd.",
number = "5",
}