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Description
A powerful table-top cryogenic plateform has been developed for Quantum computing applications. The system offers a cold plate optimized for the CMOS qubits technology developed by CEA/LETI for the QuCUBE ERC synergy project. The goal is to demonstrated a 100 CMOS-Qubits system, scalable to more than 1000 Qubits. The cryogenic system is designed for 100 mW cooling power at 500 mK, compatible with the present demonstrator.
The solution chosen is a high-flow helium-3 Joule-Thomson cycle pre-cooled by a 4 Kelvin Pulse-Tube. The table-top architecture is preferred in order to keep an easy access to the quantum components and to the control electronics installed. The pulse pulse-tube and the high flow Joule-Thomson heat exchangers cycle are mounted in a separate ‘coldbox’.
The application cryostat offers three temperature levels: a 50 K stage coupled to the pulse-tube first stage by a pressurized helium circulation loop, a 5 K stage coupled to the second pulse-tube stage by a conductive copper link, and a 500 mK stage coupled to the Joule-Thomson cycle evaporator.
The pumping speed required (~1000 L/s) is achieved by four turbopumps in order to reach 4 mmol/s helium-3 at 10 Pa on the evaporator. The cooldown time of the system is less than 12 hours, achieved by a cooling loop before starting the Joule-Thomson system.
We report the performances achieved both with helium-3 and helium-4 use and the flexibility to adapt the temperature requirement to the cooling power needed in a more demanding case to reach 1000 –CMOS Qubits.
| Submitters Country | france |
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