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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 / / / / /  
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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 
Sub Title (in English)  
Keyword(1) balanced detector  
Keyword(2) homodyne detection  
Keyword(3) 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  
2nd Author's Affiliation Gakushuin University (Gakushuin Univ.)
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Date Time 2022-12-08 14:00:00 
Presentation Time 60 minutes 
Registration for QIT 
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