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On-Chip Demagnetisation Cooling on a Cryogen-Free Dilution Refrigerator

Alexander Thomas Jones

Springer thesesJan 1, 20200 citations

A 10 mK hermetic cell for eliminating parasitic heating in cryogen-free dilution refrigerators

D. Schmoranzer, Sumit Kumar, S. Triqueneaux +5 more

CryogenicsAug 7, 20200 citations

On-Chip Demagnetisation Cooling on a Cryogen-Filled Dilution Refrigerator

Alexander Thomas Jones

Springer thesesJan 1, 20200 citations

Magnetic cooling of electrons to 311 μK in a cryo-free dilution refrigerator

Mohammad Samani, C. P. Scheller, Nikolai Yurttagül +7 more

Bulletin of the American Physical SocietyMar 18, 20210 citations

Development of a Cryogen-Free Dilution Refrigerator for Superconducting Quantum Computing

Yujia Zhai, Shiguang Wu, Dong Ma +5 more

The superconducting quantum computer with strong data storage capability and fast execution speed has attracted a lot of attention in recent years and is finding practical applications in fields such as finance, military, biomedicine, and artificial intelligence. To suppress the thermal noise and to achieve high coherence, the quantum chips require millikelvin temperature, which poses a significant challenge for the suitable cryogenic system. The dilution refrigerator (DR) with ultra-low vibration and electromagnetic interference becomes an appropriate candidate for this purpose. To achieve the aimed millikelvin temperature, a cryogen-free DR composed of a Gifford-McMahon type pulse tube refrigerator (GM-type PTR), Joule-Thompson refrigerator (JTR), and dilution unit is investigated. This article presents the structural design of the DR and the coupling system with superconducting quantum chips. The cooling performance of the designed DR is estimated based on the developed cryogenic system. The minimum deduced temperature of 0.76 K in the still is achieved and the next steps to obtain the final temperature of 5 mK are underway.The superconducting quantum computer with strong data storage capability and fast execution speed has attracted a lot of attention in recent years and is finding practical applications in fields such as finance, military, biomedicine, and artificial intelligence. To suppress the thermal noise and to achieve high coherence, the quantum chips require millikelvin temperature, which poses a significant challenge for the suitable cryogenic system. The dilution refrigerator (DR) with ultra-low vibration and electromagnetic interference becomes an appropriate candidate for this purpose. To achieve the aimed millikelvin temperature, a cryogen-free DR composed of a Gifford-McMahon type pulse tube refrigerator (GM-type PTR), Joule-Thompson refrigerator (JTR), and dilution unit is investigated. This article presents the structural design of the DR and the coupling system with superconducting quantum chips. The cooling performance of the designed DR is estimated based on the developed cryogenic system. The minimum deduced temperature of 0.76 K in the still is achieved and the next steps to obtain the final temperature of 5 mK are underway.

IEEE Transactions on Applied SuperconductivityJan 8, 20242 citations

High-Performance Cryogen-Free Platform for Microkelvin-Range Refrigeration

Ján Nyéki, Marijn Lucas, Petra Knappová +5 more

Accessibility to the microkelvin temperature regime is important for quantum technology research. Cryogen-free dilution refrigerators opened up the millikelvin temperature range, but the perception is that ultralow temperatures are difficult to reach and require specialist infrastructure. The authors report the design of a microkelvin platform based on a nuclear-demagnetization stage, engineered and optimized for operation on a cryogen-free dilution refrigerator. The study demonstrates temperatures as low as 395 $\ensuremath{\mu}$K, and a protocol that enables experiments operated below 1 mK for 95% of the time, providing an efficient cryogen-free microkelvin environment for a wide range of applications.Accessibility to the microkelvin temperature regime is important for quantum technology research. Cryogen-free dilution refrigerators opened up the millikelvin temperature range, but the perception is that ultralow temperatures are difficult to reach and require specialist infrastructure. The authors report the design of a microkelvin platform based on a nuclear-demagnetization stage, engineered and optimized for operation on a cryogen-free dilution refrigerator. The study demonstrates temperatures as low as 395 $\ensuremath{\mu}$K, and a protocol that enables experiments operated below 1 mK for 95% of the time, providing an efficient cryogen-free microkelvin environment for a wide range of applications.

Physical Review AppliedOct 24, 20228 citations

Modular and integrable cryogen-free dilution refrigerator

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