Low-noise quantum frequency conversion with cavity enhancement of converted mode

Quantum frequency conversion (QFC) which converts the frequencies of photons while preserving the quantum state is an essential technology for realizing the quantum internet and quantum interconnect. For the QFC based on the frequency downconversion from visible to the telecom wavelengths around 150...

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Bibliographic Details
Published in:arXiv.org 2024-09
Main Authors: Murakami, Shoichi, Kobayashi, Toshiki, Miki, Shigehito, Terai, Hirotaka, Kodama, Tsuyoshi, Sawaya, Tsuneaki, Ohtomo, Akihiko, Shimoi, Hideki, Yamamoto, Takashi, Ikuta, Rikizo
Format: Article
Language:English
Subjects:
Bandpass filters
Frequency filters
Narrowband
Noise generation
Photodegradation
Photons
Signal generation
Signal to noise ratio
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Summary:Quantum frequency conversion (QFC) which converts the frequencies of photons while preserving the quantum state is an essential technology for realizing the quantum internet and quantum interconnect. For the QFC based on the frequency downconversion from visible to the telecom wavelengths around 1500 nm, it is widely known that noise photons produced by the strong pump light used for QFC contaminate the frequency-converted photon, which degrades the quality of the quantum property of the photon after QFC. In conventional QFC experiments, noise photons are removed using external narrowband frequency filter systems. In contrast, in this study, we implement a compact QFC device integrating the cavity structure only for the converted mode. While the cavity structure can enhance not only the desired QFC efficiency but also the noise photon generation rate, we show that the cavity-enhanced QFC followed by a relatively wide bandpass filter achieves the signal-to-noise ratio comparable to the QFCs with external narrowband filters. We experimentally demonstrate the cavity-enhanced QFC using a single photon at 780 nm to 1540 nm, in which the non-classical photon statistics is clearly observed after QFC.
ISSN:2331-8422