中国物理B ›› 2016, Vol. 25 ›› Issue (5): 58501-058501.doi: 10.1088/1674-1056/25/5/058501

• INTERDISCIPLINARY PHYSICS AND RELATED AREAS OF SCIENCE AND TECHNOLOGY • 上一篇    下一篇

Increasing energy relaxation time of superconducting qubits with nonmagnetic infrared filter and shield

Yuhao Liu(刘宇浩), Mengmeng Li(李蒙蒙), Dong Lan(兰栋), Guangming Xue(薛光明), Xinsheng Tan(谭新生), Haifeng Yu(于海峰), Yang Yu(于扬)   

  1. 1. National Laboratory of Solid State Microstructures, School of Physics, Nanjing University, Nanjing 210093, China;
    2. Synergetic Innovation Center of Quantum Information & Quantum Physics, University of Science and Technology of China, Hefei 230026, China
  • 收稿日期:2015-12-25 修回日期:2016-01-18 出版日期:2016-05-05 发布日期:2016-05-05
  • 通讯作者: Xinsheng Tan, Haifeng Yu E-mail:txs.nju@gmail.com;hfyu@nju.edu.cn
  • 基金资助:

    Project supported by the National Natural Science Foundation of China (Grant Nos. 91321310, 11274156, 11474152, 11474153, 61521001, and 11504165) and the State Key Program for Basic Research of China (Grant Nos. 2011CB922104 and 2011CBA00205).

Increasing energy relaxation time of superconducting qubits with nonmagnetic infrared filter and shield

Yuhao Liu(刘宇浩)1, Mengmeng Li(李蒙蒙)1, Dong Lan(兰栋)1, Guangming Xue(薛光明)1, Xinsheng Tan(谭新生)1, Haifeng Yu(于海峰)1,2, Yang Yu(于扬)1,2   

  1. 1. National Laboratory of Solid State Microstructures, School of Physics, Nanjing University, Nanjing 210093, China;
    2. Synergetic Innovation Center of Quantum Information & Quantum Physics, University of Science and Technology of China, Hefei 230026, China
  • Received:2015-12-25 Revised:2016-01-18 Online:2016-05-05 Published:2016-05-05
  • Contact: Xinsheng Tan, Haifeng Yu E-mail:txs.nju@gmail.com;hfyu@nju.edu.cn
  • Supported by:

    Project supported by the National Natural Science Foundation of China (Grant Nos. 91321310, 11274156, 11474152, 11474153, 61521001, and 11504165) and the State Key Program for Basic Research of China (Grant Nos. 2011CB922104 and 2011CBA00205).

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摘要：

One of the primary origins of the energy relaxation in superconducting qubits is the quasiparticle loss. The quasiparticles can be excited remarkably by infrared radiation. In order to minimize the density of quasiparticle and increase the qubit relaxation time, we design and fabricate the infrared filter and shield for superconducting qubits. In comparison with previous filters and shields, a nonmagnetic dielectric is used as the infrared absorbing material, greatly suppressing the background magnetic fluctuations. The filters can be made to impedance-match with other microwave devices. Using the as-fabricated infrared filter and shield, we increased the relaxation time of a transmon qubit from 519 ns to 1125 ns.

关键词: qubit relaxation, superconducting qubit, infrared filter, infrared shield

Abstract:

One of the primary origins of the energy relaxation in superconducting qubits is the quasiparticle loss. The quasiparticles can be excited remarkably by infrared radiation. In order to minimize the density of quasiparticle and increase the qubit relaxation time, we design and fabricate the infrared filter and shield for superconducting qubits. In comparison with previous filters and shields, a nonmagnetic dielectric is used as the infrared absorbing material, greatly suppressing the background magnetic fluctuations. The filters can be made to impedance-match with other microwave devices. Using the as-fabricated infrared filter and shield, we increased the relaxation time of a transmon qubit from 519 ns to 1125 ns.

Key words: qubit relaxation, superconducting qubit, infrared filter, infrared shield

中图分类号:  (Josephson devices)

  • 85.25.Cp
03.67.Lx (Quantum computation architectures and implementations) 07.20.Mc (Cryogenics; refrigerators, low-temperature detectors, and other low-temperature equipment)