Room-temperature biphoton source with a spectral brightness near the ultimate limit

Chen, Jia-Mou; Hsu, Chia-Yu; Huang, Wei‐Kai; Hsiao, Shih-Si; Huang, Fon-Shan; Chen, Yi-Hsin; Chuu, Chih-Sung; Chen, Ying-Cheng; Chen, Yong-Fan; Yu, Ite A.

doi:10.1103/physrevresearch.4.023132

Cited by 18 publications

(3 citation statements)

References 67 publications

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“…The shaded orange area visualizes the influence of pump-dependent noise as explained in the main text. [9]. The transition from temporally separated to overlapping pairs is visualized by the blue color gradient in figure 4(c).…”

Section: Resultsmentioning

confidence: 99%

“…The highest generated spectral brightnesses (GSB) reported so far in excess of 1 × 10 5 pairs/(s MHz) were achieved using a variety of different experimental systems. These are waveguides combined with cavities [6,7], a bulk crystal inside a cavity [8], and a room-temperature atomic ensemble [9]. The bandwidths of these biphoton sources ranged from sub-MHz [9] to around 100 MHz [7] and the generated spectral brightness per pump power (GSBP) 87 Rb.…”

Section: Introductionmentioning

confidence: 99%

“…These are waveguides combined with cavities [6,7], a bulk crystal inside a cavity [8], and a room-temperature atomic ensemble [9]. The bandwidths of these biphoton sources ranged from sub-MHz [9] to around 100 MHz [7] and the generated spectral brightness per pump power (GSBP) 87 Rb. The excited states decay at rates Γ D1 = 2π× 5.75 MHz and Γ D2 = 2π× 6.06 MHz.…”

Section: Introductionmentioning

confidence: 99%

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Ultrabright and narrowband intra-fiber biphoton source at ultralow pump power

Bruns

Hsu

Stryzhenko

et al. 2022

Quantum Sci. Technol.

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Nonclassical photon sources of high brightness are key components of quantum communication technologies. We here demonstrate the generation of narrowband, nonclassical photon pairs by employing spontaneous four-wave mixing in an optically-dense ensemble of cold atoms within a hollow-core fiber. The brightness of our source approaches the limit of achievable generated spectral brightness at which successive photon pairs start to overlap in time. For a generated spectral brightness per pump power of up to 2×109 pairs/(s·MHz·nW) we observe nonclassical correlations at pump powers below 100 nW and a narrow bandwidth of 2π×6.5 MHz. In this regime we demonstrate that our source can be used as a heralded single-photon source. By further increasing the brightness we enter the regime where successive photon pairs start to overlap in time and the cross-correlation approaches a limit corresponding to thermal statistics. Our approach of combining the advantages of atomic ensembles and waveguide environments is an important step towards photonic quantum networks of ensemble based elements.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Ultrabright and narrowband intra-fiber biphoton source at ultralow pump power

Bruns

Hsu

Stryzhenko

et al. 2022

Quantum Sci. Technol.

Self Cite

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High‐Performance Telecom‐Wavelength Biphoton Source from a Hot Atomic Vapor Cell

Jeong,

Kim,

Moon

2023

Adv Quantum Tech

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Telecom‐band quantum light sources are critical to the development of long‐distance quantum communication technologies. A high‐performance telecom‐wavelength biphoton source from a hot 87Rb atomic vapor cell is reported. Time‐correlated biphotons are generated from the cascade‐type 5S1/2–5P3/2–4D5/2 transition of 87Rb via a spontaneous four‐wave mixing process. The maximum value of biphoton cross‐correlation to be 44(3) is achieved, under the condition of a high optical depth of 112(3), including two‐photon absorption, with a spectral width of approximately 300 MHz. The coincidence count rate of biphoton is estimated to be of the order of 38 000 cps mW−1. It is believed that the telecom‐wavelength biphoton source from an atomic vapor cell can be applied in long‐distance quantum networks and practical quantum repeaters based on atom–photon interactions.

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Review of Biphoton Sources Based on the Double‐Λ$\Lambda$ Spontaneous Four‐Wave Mixing Process

Chen,

Peters,

Hsieh

et al. 2024

Adv Quantum Tech

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This review article focuses on biphoton sources based on the double‐ spontaneous four‐wave mixing (SFWM) process in laser‐cooled as well as room‐temperature or hot atomic ensembles. These biphoton sources have the advantage of providing stable frequencies, ultranarrow linewidths, and a tunability of the temporal biphoton width of more than one order of magnitude for high‐bandwidth applications. Therefore, the generated photons can be efficiently interfaced to, e.g., atomic quantum memories. In contrast, solid‐state biphoton sources typically require assistance by an optical cavity to operate at narrow linewidth that limits the tunability of the temporal width of the biphotons. Present state‐of‐the‐art double‐ SFWM biphoton sources can achieve one of the following results: a spectral linewidth of 50 kHz (290 kHz) or a temporal width of 13 (580 ns) with cold (hot) atoms, a detection rate of about 7 cps, and a generation rate of cps at a duty cycle of 0.4% or of cps in the steady state. The theoretical background of these biphoton sources, experimental implementations with cold and hot atoms, and progress over the years, will be illustrated.

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Room-temperature biphoton source with a spectral brightness near the ultimate limit

Cited by 18 publications

References 67 publications

Ultrabright and narrowband intra-fiber biphoton source at ultralow pump power

Ultrabright and narrowband intra-fiber biphoton source at ultralow pump power

High‐Performance Telecom‐Wavelength Biphoton Source from a Hot Atomic Vapor Cell

Review of Biphoton Sources Based on the Double‐Λ$\Lambda$ Spontaneous Four‐Wave Mixing Process

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