Translation from a Distinguishable to Indistinguishable Two-Photon State

Lee, Dongjin; Park, Kyungdeuk; Shin, Woncheol; Shin, Heedeuk

doi:10.1021/acsphotonics.3c00817

Cited by 3 publications

(3 citation statements)

References 45 publications

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“…Blue squares and red diamonds depict the net visibilities for the forward and backward directions of BS-FWM, respectively. The solid blue and dashed red lines correlate to the numerical simulations using a Green-function method 30 , 35 , modeling the effect of BS-FWM 36 , 37 as an input-output relation. See Supplementary Information, Sec.…”

Section: Resultsmentioning

confidence: 95%

“…We utilize frequency beam splitters based on quantum frequency translation, akin to the spatial beam splitters. The frequency translation method used in this study is BS-FWM 20 , 21 , 30 , which facilitates the simultaneous annihilation of an input photon and the creation of a target photon, driven by two classical pump fields 31 , 32 , as seen in Fig. 1b .…”

Section: Resultsmentioning

confidence: 99%

“…As we assume that the frequency translation occurs only between signal and idler wavelengths, the reflectance (red diamonds) of the splitting ratio is . In reality, a small percentage of photons are diverted due to scattering into higher-order modes, but this loss is minor and does not significantly affect the calculation of the splitting ratio 30 .

Fig.…”

Section: Resultsmentioning

confidence: 99%

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NOON-state interference in the frequency domain

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et al. 2024

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The examination of entanglement across various degrees of freedom has been pivotal in augmenting our understanding of fundamental physics, extending to high dimensional quantum states, and promising the scalability of quantum technologies. In this paper, we demonstrate the photon number path entanglement in the frequency domain by implementing a frequency beam splitter that converts the single-photon frequency to another with 50% probability using Bragg scattering four-wave mixing. The two-photon NOON state in a single-mode fiber is generated in the frequency domain, manifesting the two-photon interference with two-fold enhanced resolution compared to that of single-photon interference, showing the outstanding stability of the interferometer. This successful translation of quantum states in the frequency domain will pave the way toward the discovery of fascinating quantum phenomena and scalable quantum information processing.

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Section: Resultsmentioning

confidence: 95%

Section: Resultsmentioning

confidence: 99%

Fig.…”

Section: Resultsmentioning

confidence: 99%

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NOON-state interference in the frequency domain

Lee,

Shin,

Park

et al. 2024

Light Sci Appl

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Photon-pair generation using inverse-designed thin-film lithium niobate mode converters

Kwon,

Heo,

Lee

et al. 2024

APL Photonics

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Spontaneous parametric down-conversion (SPDC) has become a key method for generating entangled photon pairs. Periodically poled thin-film lithium niobate (TFLN) waveguides induce strong SPDC but require complex fabrication processes. In this work, we experimentally demonstrate efficient SPDC and second harmonic generation using modal phase matching methods. This is achieved with inverse-designed optical mode converters and low-loss optical waveguides in a single nanofabrication process. Inverse design methods provide enhanced functionalities and compact footprints for the converter. Despite the extensive achievements in inverse-designed photonic integrated circuits, the potential of inverse-designed TFLN quantum photonic devices has been seldom explored. The device shows an on-chip conversion efficiency of 3.95% W−1 cm−2 in second harmonic generation measurements and a coincidence count rate up to 21.2 kHz in SPDC experiments. This work highlights the potential of the inverse-designed TFLN photonic devices and paves the way for their applications in on-chip nonlinear or quantum optics.

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Measurement of dispersion properties in a short optical fiber for an efficient quantum frequency converter

Lee,

Kim,

Shin

2024

Opt. Express

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Optical fibers have played a pivotal role in the long-distance transportation of quantum states and quantum key distribution due to their low loss. They have garnered attention for photon-pair generation and quantum frequency conversion due to their engineered dispersion properties. Accurate measurement of dispersion properties is essential for these applications. In this study, we introduce a new method to measure the dispersion properties of short optical fibers using Bragg-scattering four-wave mixing (BS-FWM). We successfully measured properties, including zero group-velocity-dispersion wavelength, dispersion slope, and the nonlinear coefficient, for fiber lengths ranging from 9.7 m to 392.7 m. Furthermore, we achieved efficient quantum frequency conversion with an efficiency of 83.8±0.8% using parameters extracted from a 53.9-m-long optical fiber. Our research offers a valuable resource for improving the performance of fiber-based photon-pair sources and quantum frequency converters and has potential implications for advancing fiber-based quantum information processing.

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Translation from a Distinguishable to Indistinguishable Two-Photon State

Cited by 3 publications

References 45 publications

NOON-state interference in the frequency domain

NOON-state interference in the frequency domain

Photon-pair generation using inverse-designed thin-film lithium niobate mode converters

Measurement of dispersion properties in a short optical fiber for an efficient quantum frequency converter

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