Spectral–temporal biphoton waveform of photon pairs from cascade-type warm atoms

Park, Jiho; Jeong, Taek; Moon, Han Seb

doi:10.1038/s41598-020-73610-2

Cited by 2 publications

(2 citation statements)

References 26 publications

(74 reference statements)

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“…In the atom-photon interactions of a warm atomic ensemble, we should consider the inhomogeneous broadening due to the thermal motion of atoms with the Maxwell-Boltzmann distribution. Doppler broadening affects the properties of the photons generated from the warm atomic ensemble because the velocity class of the atoms satisfied by the two-photon resonance is determined in the warm atomic vapor [34]. The wavelengths of the interacting lasers and the emitted photons can affect the BTW of a photon pair from a moving atom with a different velocity because it presumably integrates the BTWs of the photon pairs emitted from each atom with the Maxwell-Boltzmann velocity distribution.…”

Section: Introductionmentioning

confidence: 99%

Collective biphoton temporal waveform of photon-pair generated from Doppler-broadened atomic ensemble

Kim,

Jeong,

Moon

2024

Quantum Sci. Technol.

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Photonic quantum states generated from atomic ensembles will play important roles in future quantum networks and long-distance quantum communication because their advantages, such as universal identity and narrow spectral bandwidth, are essential for quantum nodes and quantum repeaters based on atomic ensembles. In this study, we report the collectively coherent superposition of biphoton wavefunction emitted from different velocity classes in a Doppler-broadened cascade-type atomic ensemble. We experimentally demonstrate that the three times difference of temporal width of both biphoton temporal waveforms varies dependent on the wavelengths of the signal and idler photons from both 6S1/2–6P3/2–6D5/2 and –8S1/2 transitions of 133Cs, corresponding to the idler and signal wavelengths of 852 nm–917 nm and 852 nm–795 nm, respectively. Our results help understand the characteristics of biphoton sources from a warm atomic ensemble and can be applied to long-distance quantum networks and practical quantum repeaters based on atom-photon interactions.

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Section: Introductionmentioning

confidence: 99%

Collective biphoton temporal waveform of photon-pair generated from Doppler-broadened atomic ensemble

Kim,

Jeong,

Moon

2024

Quantum Sci. Technol.

View full text Add to dashboard Cite

show abstract

“…In the atom-photon interactions of a warm atomic ensemble, we should consider the inhomogeneous broadening due to the thermal motion of atoms with the Maxwell-Boltzmann distribution. Doppler broadening affects the properties of the photons generated from the warm atomic ensemble because the velocity class of the atoms satisfied by the two-photon resonance is determined in the warm atomic vapor [33]. The wavelengths of the interacting lasers and the emitted photons can affect the BTW of a photon pair from a moving atom with a different velocity because it presumably integrates the BTWs of the photon pairs emitted from each atom with the Maxwell-Boltzmann velocity distribution.…”

mentioning

confidence: 99%

Student Movement and Busan-Masan Uprising in the Late 1970s - Centering on the Pusan National University Protest -

Sun-mi¹

2018

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Recent progress in semi-and self-supervised learning has caused a rift in the longheld belief about the need for an enormous amount of labeled data for machine learning and the irrelevancy of unlabeled data. Although it has been successful in various data, there is no dominant semi-and self-supervised learning method that can be generalized for tabular data (i.e. most of the existing methods require appropriate tabular datasets and architectures). In this paper, we revisit self-training which can be applied to any kind of algorithm including the most widely used architecture, gradient boosting decision tree, and introduce curriculum pseudo-labeling (a state-of-the-art pseudo-labeling technique in image) for a tabular domain. Furthermore, existing pseudo-labeling techniques do not assure the cluster assumption when computing confidence scores of pseudo-labels generated from unlabeled data. To overcome this issue, we propose a novel pseudo-labeling approach that regularizes the confidence scores based on the likelihoods of the pseudo-labels so that more reliable pseudo-labels which lie in high density regions can be obtained. We exhaustively validate the superiority of our approaches using various models and tabular datasets.

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Spectral–temporal biphoton waveform of photon pairs from cascade-type warm atoms

Cited by 2 publications

References 26 publications

Collective biphoton temporal waveform of photon-pair generated from Doppler-broadened atomic ensemble

Collective biphoton temporal waveform of photon-pair generated from Doppler-broadened atomic ensemble

Student Movement and Busan-Masan Uprising in the Late 1970s - Centering on the Pusan National University Protest -

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