{"ID":2835364,"CreatedAt":"2026-06-01T04:54:23.091178241Z","UpdatedAt":"2026-06-01T04:54:23.091178241Z","DeletedAt":null,"paper_url":"https://arxiv.org/abs/2511.22920","arxiv_id":"2511.22920","title":"CO-QLink: Cryogenic Optical Link for Scalable Quantum Computing Systems and High-Performance Cryogenic Computing Systems","abstract":"Cryogenic systems necessitate extensive data transmission between room-temperature and cryogenic environments, as well as within the cryogenic temperature domain. High-speed, low-power data transmission is pivotal to enabling the deployment of larger-scale cryogenic systems, including the scalable quantum computing systems and the high-performance cryogenic computing systems fully immersed in liquid nitrogen. In contrast to wireline and microwave links, optical communication links are emerging as a solution characterized by high data rates, high energy efficiency, low signal attenuation, absence of thermal conduction, and superior scalability. In this work, a 4K heat-insulated high-speed (56Gbps) low-power (1.6pJ/b) transceiver (TRX) that achieves a complete link between 4K systems and room temperature (RT) equipment is presented. Copackaged with a PIN photodiode (PD), the RX uses an inverter-based analog front-end and an analog half-rate clock data recovery loop. Connecting to a Mach-Zehnder modulator (MZM), the TX contains a voltage-mode driver with current-mode injection for low-power output-swing-boosting and 3-tap feed-forward equalization (FFE). This link has been demonstrated in the control and readout of a complete superconducting quantum computing system.","short_abstract":"Cryogenic systems necessitate extensive data transmission between room-temperature and cryogenic environments, as well as within the cryogenic temperature domain. High-speed, low-power data transmission is pivotal to enabling the deployment of larger-scale cryogenic systems, including the scalable quantum computing sys...","url_abs":"https://arxiv.org/abs/2511.22920","url_pdf":"https://arxiv.org/pdf/2511.22920v1","authors":"[\"Zheng Chang\",\"Siqi Zhang\",\"Wenqiang Huang\",\"Tian Tian\",\"Qichun Liu\",\"Tiefu Li\",\"Nan Qi\",\"Yuanjin Zheng\",\"Zhihua Wang\",\"Yanshu Guo\",\"Hanjun Jiang\"]","published":"2025-11-28T06:47:27Z","proceeding":"quant-ph","tasks":"[\"quant-ph\",\"eess.SP\"]","methods":"[]","has_code":false}