In addition to striving to assemble more and more qubits in a single monolithic quantum device, taking a modular design strategy may mitigate numerous engineering challenges for achieving large-scalable quantum processors with superconducting qubits. Nevertheless, a major challenge in the modular quantum device is how to realize high-fidelity entanglement operations on qubits housed in different modules while preserving the desired isolation between modules. In this work, we propose a conceptual design of a modular quantum device, where nearby modules are spatially separated by centimeters. In principle, each module can contain tens of superconducting qubits and can be separately fabricated, characterized, packaged, and replaced. By introducing a bridge module between nearby qubit modules and taking the coupling scheme utilizing a tunable bus, tunable coupling of qubits that are housed in nearby qubit modules could be realized. Given physically reasonable assumptions, we expect that sub-100-ns two-qubit gates for qubits housed in nearby modules, which are spatially separated by more than two centimeters could be obtained. In this way, the inter-module gate operations are promising to be implemented with gate performance comparable with that of intra-module gate operations. Moreover, with the help of through-silicon vias technologies, this long-range coupling scheme may also allow one to implement inter-module couplers in a multi-chip stacked processor. Thus, the tunable longer-range coupling scheme and the proposed modular architecture may provide a promising foundation for solving challenges toward large-scale quantum information processing with superconducting qubits.
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Tunable coupling of widely separated superconducting qubits: A possible application toward a modular quantum device
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18 July 2022
Research Article|
July 19 2022
Tunable coupling of widely separated superconducting qubits: A possible application toward a modular quantum device
Peng Zhao
;
Peng Zhao
a)
(Conceptualization, Data curation, Validation, Writing – review & editing)
Beijing Academy of Quantum Information Sciences
, Beijing 100193, China
a)Author to whom correspondence should be addressed: shangniguo@sina.com
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Yingshan Zhang
;
Yingshan Zhang
b)
(Conceptualization, Formal analysis, Investigation, Validation, Writing – review & editing)
Beijing Academy of Quantum Information Sciences
, Beijing 100193, China
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Guangming Xue;
Guangming Xue
c)
(Conceptualization, Data curation, Formal analysis, Visualization, Writing – review & editing)
Beijing Academy of Quantum Information Sciences
, Beijing 100193, China
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Yirong Jin
;
Yirong Jin
(Funding acquisition, Visualization)
Beijing Academy of Quantum Information Sciences
, Beijing 100193, China
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Haifeng Yu
Haifeng Yu
(Funding acquisition, Supervision)
Beijing Academy of Quantum Information Sciences
, Beijing 100193, China
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a)Author to whom correspondence should be addressed: shangniguo@sina.com
b)
Electronic mail: zhangys@baqis.ac.cn
c)
Electronic mail: xuegm@baqis.ac.cn
Appl. Phys. Lett. 121, 032601 (2022)
Article history
Received:
April 29 2022
Accepted:
June 06 2022
Citation
Peng Zhao, Yingshan Zhang, Guangming Xue, Yirong Jin, Haifeng Yu; Tunable coupling of widely separated superconducting qubits: A possible application toward a modular quantum device. Appl. Phys. Lett. 18 July 2022; 121 (3): 032601. https://doi.org/10.1063/5.0097521
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