Paper Abstract and Keywords |
Presentation |
2022-12-08 14:00
[Poster Presentation]
Quantum Noise Measurements with a GHz-Bandwidth Low-Noise Balanced Detector Sakurako Seino, Takuya Hirano (Gakushuin Univ.) |
Abstract |
(in Japanese) |
(See Japanese page) |
(in English) |
Homodyne detection is widely used as a means of measuring the quadrature-phase amplitude of light, and a broadband balanced detector operating at the quantum noise limit is needed to speed up continuous-variable quantum information processing. In this study, we evaluate a custom-developed low-noise balanced detector by measuring the quadrature-phase amplitudes of the vacuum states. In the frequency domain evaluation using a spectrum analyzer, the noise clearance (the increase of the quantum noise relative to the detector noise power) of 10 dB at 3 GHz is achieved, indicating that a broadband low-noise homodyne detector is realized. The measured noise powers, when the detector noise is subtracted, are proportional to the optical power of the local oscillator light at all frequencies, confirming a linear response of the custom balanced detector. We also perform the time-domain evaluation using a high-speed digitizer, and confirm the low noise and linear operation of the detector. |
Keyword |
(in Japanese) |
(See Japanese page) |
(in English) |
balanced detector / homodyne detection / continuous-variable quantum key distribution / / / / / |
Reference Info. |
IEICE Tech. Rep. |
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Conference Information |
Committee |
QIT |
Conference Date |
2022-12-08 - 2022-12-09 |
Place (in Japanese) |
(See Japanese page) |
Place (in English) |
Keio Univ. |
Topics (in Japanese) |
(See Japanese page) |
Topics (in English) |
Quantum Information |
Paper Information |
Registration To |
QIT |
Conference Code |
2022-12-QIT |
Language |
Japanese |
Title (in Japanese) |
(See Japanese page) |
Sub Title (in Japanese) |
(See Japanese page) |
Title (in English) |
Quantum Noise Measurements with a GHz-Bandwidth Low-Noise Balanced Detector |
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balanced detector |
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homodyne detection |
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continuous-variable quantum key distribution |
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1st Author's Name |
Sakurako Seino |
1st Author's Affiliation |
Gakushuin University (Gakushuin Univ.) |
2nd Author's Name |
Takuya Hirano |
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Gakushuin University (Gakushuin Univ.) |
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Author-1 |
Date Time |
2022-12-08 14:00:00 |
Presentation Time |
60 minutes |
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QIT |
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