Compared to traditional semiconductor control electronics (TSCE) located at room temperature, cryogenic single flux quantum (SFQ) electronics can provide qubit measurement and control alternatives that address critical issues related to scalability of cryogenic quantum processors. Single-qubit control and readout have been demonstrated recently using SFQ circuits coupled to superconducting qubits. Experiments where the SFQ electronics are co-located with the qubit have suffered from excess decoherence and loss due to quasiparticle poisoning of the qubit. A previous experiment by our group showed that moving the control electronics to the 3 K stage of the dilution refrigerator avoided this source of decoherence in a high-coherence three-dimensional transmon geometry. In this paper, we also generate the pulses at the 3 K stage but have optimized the qubit design and control lines for scalable two-dimensional transmon devices. We directly compare the qubit lifetime , coherence time , and gate fidelity when the qubit is controlled by the Josephson pulse generator (JPG) circuit vs the TSCE setup. We find agreement within the daily fluctuations for and , and agreement within 10% for randomized benchmarking. We also performed interleaved randomized benchmarking on individual JPG gates demonstrating an average error per gate of 0.46% showing good agreement with what is expected based on the qubit coherence and higher-state leakage. These results are an order of magnitude improvement in gate fidelity over our previous work and demonstrate that a Josephson microwave source operated at 3 K is a promising component for scalable qubit control.
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Coherence-limited digital control of a superconducting qubit using a Josephson pulse generator at 3 K
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8 May 2023
Research Article|
May 08 2023
Coherence-limited digital control of a superconducting qubit using a Josephson pulse generator at 3 K
Special Collection:
Advances in Superconducting Logic
M. A. Castellanos-Beltran
;
M. A. Castellanos-Beltran
a)
(Conceptualization, Data curation, Formal analysis, Resources, Visualization, Writing – original draft, Writing – review & editing)
1
National Institute of Standards and Technology
, Boulder Colorado 80305, USA
a)Author to whom correspondence should be addressed: [email protected]
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A. J. Sirois
;
A. J. Sirois
(Conceptualization, Formal analysis, Resources, Writing – original draft, Writing – review & editing)
1
National Institute of Standards and Technology
, Boulder Colorado 80305, USA
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L. Howe
;
L. Howe
(Data curation, Formal analysis, Resources, Software, Visualization, Writing – review & editing)
1
National Institute of Standards and Technology
, Boulder Colorado 80305, USA
2
University of Colorado
, Boulder Colorado 80309, USA
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D. Olaya
;
D. Olaya
(Resources)
1
National Institute of Standards and Technology
, Boulder Colorado 80305, USA
2
University of Colorado
, Boulder Colorado 80309, USA
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J. Biesecker;
J. Biesecker
(Resources)
1
National Institute of Standards and Technology
, Boulder Colorado 80305, USA
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S. P. Benz
;
S. P. Benz
(Project administration, Supervision, Writing – review & editing)
1
National Institute of Standards and Technology
, Boulder Colorado 80305, USA
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P. F. Hopkins
P. F. Hopkins
(Project administration, Supervision, Writing – review & editing)
1
National Institute of Standards and Technology
, Boulder Colorado 80305, USA
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a)Author to whom correspondence should be addressed: [email protected]
Note: This paper is part of the APL Special Collection on Advances in Superconducting Logic.
Appl. Phys. Lett. 122, 192602 (2023)
Article history
Received:
February 24 2023
Accepted:
April 14 2023
Citation
M. A. Castellanos-Beltran, A. J. Sirois, L. Howe, D. Olaya, J. Biesecker, S. P. Benz, P. F. Hopkins; Coherence-limited digital control of a superconducting qubit using a Josephson pulse generator at 3 K. Appl. Phys. Lett. 8 May 2023; 122 (19): 192602. https://doi.org/10.1063/5.0147692
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