40 km fiber transmission of squeezed light measured with a real local oscillator. (1st October 2022)

• Record Type: Journal Article
• Authors: Suleiman, I; Nielsen, J A H; Guo, X; Jain, N; Neergaard-Nielsen, J; Gehring, T; Andersen, U L
• Is Part Of: Quantum science and technology. Volume 7:Number 4(2022)
• Publication Date: 2022-10-01
• Subjects: quantum key distribution -- squeezed -- homodyne detection -- local local oscillator -- real local oscillator -- quantum information -- photonic; Quantum theory -- Periodicals; Quantum theory; Periodicals; 530
• DOI: 10.1088/2058-9565/ac7ba1
• Languages: English
• ISSNs: 2058-9565

Abstract

Abstract: We demonstrate the generation, 40 km fiber transmission, and homodyne detection of single-mode squeezed states of light at 1550 nm using real-time phase control of a locally generated local oscillator (LO), often called a 'real LO' or 'local LO'. The system was able to stably measure up to around 3.7 dB of noise suppression with a phase noise uncertainty of around 2.5°, using only standard telecom-compatible components and a field-programmable gate array. The compactness, low degree of complexity and efficacy of the implemented scheme makes it a relevant candidate for long distance quantum communication in future photonic quantum networks.