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| Home > Publications database > Performance and signal quality analysis of a photonic link from room temperature to 6K using laser-photodiodes |
| Poster (After Call) | FZJ-2024-05996 |
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2024
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Please use a persistent id in citations: doi:10.34734/FZJ-2024-05996
Abstract: Quantum computers rely on qubits, which are sensitive to temperature and are kept in cryogenic environments to reduce thermal disruptions. Maintaining stable operation at millikelvin temperatures is essential, requiring minimal power consumption and electronic interference in the cryogenic chamber, along with optimal thermal isolation. Effectively controlling qubits requires high-frequency signals with substantial data bandwidth. In large-scale quantum systems operating at low temperatures, establishing robust signal connections between the cooled core and external components at room temperature is crucial. Traditional coaxial cable connections encounter limitations when scaling to thousands of qubits due to cabling bottlenecks. A promising alternative is the use of a compact multiplexed photonic link utilizing a laser-photodiode setup, which also incorporates reduced thermal conductivity. Given that the current signal in superconducting qubits is crucial for encoding and manipulating quantum information, higher-quality signals with low noise serve as a key element in the control and operation of the qubit, allowing for the execution of quantum algorithms in a superconducting quantum computing system. Within the project QSolid - Quantum Computer in the Solid State, funded by the Federal Ministry of Education and Research (BMBF), this study focuses on setting up unbiased low optical loss photonic links in a cryostat to obtain higher-quality signal with a low thermal impact profile. The research demonstrates the performance of Silicon and InGaAs photodiodes at temperatures as low as 6K, along with frequency responses, paving the way for measurements down to millikelvin levels. The current setup achieves a commendable low optical loss of -1.5 dB.
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