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

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...

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Published inChinese physics B Vol. 25; no. 5; pp. 457 - 460
Main Author 刘宇浩 李蒙蒙 兰栋 薛光明 谭新生 于海峰 于扬
Format Journal Article
LanguageEnglish
Published 01.05.2016
Subjects
Absorption
Infrared
Infrared filters
Microwaves
Qubits (quantum computing)
Relaxation time
Shields
Superconductivity
准粒子
屏蔽
滤波器
红外辐射
能量弛豫时间
超导
量子比特
非磁性介质
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Summary: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.
Bibliography:qubit relaxation; superconducting qubit; infrared filter; infrared shield
Yuhao Liu, Mengmeng Li, Dong Lan , Guangming Xue, Xinsheng Tan, Haifeng yu, and Yang Yu（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）
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.
11-5639/O4
ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
content type line 23
ISSN:1674-1056
2058-3834
1741-4199
DOI:10.1088/1674-1056/25/5/058501