Earticle

초록

영어

This paper reviews the literature that has been published since 1980s related to cryogenic refrigeration systems for quantum computing. The reason why such a temperature level of 10-20 mK is necessary for quantum computing is that the superconducting qubit is sensitive to even very small thermal disturbances. The entanglement of the qubits may not be sustained due to thermal fluctuations and mechanical vibrations beyond their thresholds. This phenomenon is referred to as decoherence, and it causes an computation error in operation. For the stable operation of the quantum computer, a low-vibration cryogenic refrigeration system is imperative as an enabling technology. Conventional dilution refrigerators (DR), so called ‘wet’ DR, are precooled by liquid helium, but a more convenient and economical precooling method can be achieved by using a mechanical refrigerator instead of liquid cryogen. These ‘dry’ DRs typically equip pulse-tube refrigerators (PTR) for precooling the DRs around 4 K because of its particular advantage of low vibration characteristic. In this review paper, we have focused on the development status of 4 K PTRs and further potential development issues will be also discussed. A quiet 4 K refrigerator not only serves as an indispensable precooler of DR but also immediately enhances the characteristics of low noise amplifiers (LNA) or other cryo-electronics of various type quantum computers.

목차

Abstract
1. INTRODUCTION
2. CRYOGENIC REFRIGERATION SYSTEM
2.1. Development of a 4.2 K pulse-tube refrigerator (PTR)
2.2. GM-type PTR as a precooler for a dilution refrigerator (DR)
2.3. Stirling-type PTR as a precooler for DR
3. DISCUSSIONS
3.1. Further improvements of GM-type PTR
3.2. High efficiency and low disturbance
4. CONCLUDING REMARKS
ACKNOWLEDGEMENT
REFERENCES

키워드

저자

• Jiho Park [ Korea Institute of Machinery and Materials, Daejeon, Rep. of Korea ] Corresponding Author
• Bokeum Kim [ Korea Advanced Institute of Science and Technology, Daejeon, Rep. of Korea ]
• Sangkwon Jeong [ Korea Advanced Institute of Science and Technology, Daejeon, Rep. of Korea ]

참고문헌

발행기관

간행물

표지보기 관심저널 등록

• 간행물명

  한국초전도·저온논문지 (구 한국초전도저온공학회논문지) [Progress in Superconductivity and Cryogenics]

• 간기

  계간

• pISSN

  1229-3008

• eISSN

  2287-6251

• 수록기간

  1999~2026

• 등재여부

  KCI 등재,SCOPUS

• 십진분류

  KDC 427 DDC 537