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Applied Sciences
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Superconducting Quantum Computing and Devices
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Superconducting Quantum Computing and Devices

A special issue of Applied Sciences (ISSN 2076-3417). This special issue belongs to the section "Quantum Science and Technology".

Deadline for manuscript submissions: closed (31 March 2023) | Viewed by 8508

Special Issue Editor

Prof. Dr. Yang Yu

E-Mail Website
Guest Editor
School of Physics, Nanjing University, Nanjing 210093, China
Interests: superconducting qubit; superconducting quantum computing; quantum simulation; superconducting quantum device

Special Issue Information

Dear Colleagues,

Due to its scalability, superconducting qubit based on Josephson junction circuits has become one of the most promising candidates for realizing practical quantum computation and quantum simulation. Although fault-tolerant quantum computing remains a challenge, with the recent demonstrations of quantum advantage, superconducting quantum computation has been stepping into the “noisy intermediate scale quantum” (NISQ) technology era, in which non-error-corrected qubits are used to implement quantum algorithms and quantum simulations. In order to implement superconducting quantum computing, people have developed many superconducting devices, such as superconducting transmon qubit, high-Q superconducting cavity, tunable coupler, Purcell filter, and Josephson parametric amplifier, which play an essential role in the manipulation and readout of superconducting qubit. This area is continuing to expand.

Prof. Dr. Yang Yu
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

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Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2400 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • superconducting quantum computing
  • superconducting quantum simulation
  • superconducting qubits
  • JPA
  • superconducting quantum devices
  • quantum algorithm
  • quantum control
  • quantum error correction
  • quantum measurement
  • circuit QED
  • quantum circuit

Published Papers (5 papers)

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Research

9 pages, 3657 KiB  
Article
Locating Two-Level Systems in a Superconducting Xmon Qubit
by Xin-Xin Yang, Xiao-Yan Yang, Liang-Liang Guo, Lei Du, Peng Duan, Zhi-Long Jia, Hai-Ou Li and Guo-Ping Guo
Appl. Sci. 2023, 13(11), 6672; https://doi.org/10.3390/app13116672 - 30 May 2023
Viewed by 1489
Abstract
One significant source of decoherence in superconducting circuits is known as two-level systems (TLSs), found in amorphous oxide layers. These circuits can, however, also be utilized as spectral and temporal TLS probes. Comprehensive investigations on the physics of TLSs are now possible thanks [...] Read more.
One significant source of decoherence in superconducting circuits is known as two-level systems (TLSs), found in amorphous oxide layers. These circuits can, however, also be utilized as spectral and temporal TLS probes. Comprehensive investigations on the physics of TLSs are now possible thanks to recent advancements in superconducting qubits. Here, we simultaneously measure the tunable Xmon qubit decoherence time as well as the resonance frequency for more than 3 days to investigate stochastic fluctuations. Time-domain Allan deviation and frequency-domain power spectral density analysis indicate that two TLSs in near resonance with the qubit are responsible for the fluctuations. From the extracted oscillation in T1 decay, we locate the two TLSs near the junctions. Full article
(This article belongs to the Special Issue Superconducting Quantum Computing and Devices)
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16 pages, 1111 KiB  
Article
Optimized Unconventional Geometric Gates in Superconducting Circuits
by Yueheng Liu and Xinding Zhang
Appl. Sci. 2023, 13(6), 4041; https://doi.org/10.3390/app13064041 - 22 Mar 2023
Viewed by 926
Abstract
Nonadiabatic Abelian geometric quantum computation has been extensively studied, due to its fast manipulation and inherent noise resistance. However, to obtain the pure geometric phase, the quantum state is required to evolve along some special paths to eliminate the dynamical phase. This leads [...] Read more.
Nonadiabatic Abelian geometric quantum computation has been extensively studied, due to its fast manipulation and inherent noise resistance. However, to obtain the pure geometric phase, the quantum state is required to evolve along some special paths to eliminate the dynamical phase. This leads to increasing evolution time and weakened gate robustness. The unconventional geometric quantum computation is an effective way to solve the above problems. Here, we propose a general approach to realize the unconventional geometric computation. Then, we discuss the effect of the ratio of geometric phase to dynamic phase on the performance of quantum gates. The results show that the selection of ratio corresponds to different quantum gate robustness. Therefore, we can optimize the ratio to get higher-fidelity quantum gates. At last, we construct the ratio-optimized quantum gates in a superconducting circuit and test its robustness. The fidelities of the T-gate, Hadamard H-gate, and controlled phase gate can be obtained as 99.98%, 99.95%, and 99.85%, respectively. Therefore, our scheme provides a promising way to realize large-scale fault-tolerant quantum computation in superconducting circuits. Full article
(This article belongs to the Special Issue Superconducting Quantum Computing and Devices)
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8 pages, 1129 KiB  
Communication
Fast Reset Protocol for Superconducting Transmon Qubits
by Wei-Ping Yuan, Zhi-Cheng He, Sai Li and Zheng-Yuan Xue
Appl. Sci. 2023, 13(2), 817; https://doi.org/10.3390/app13020817 - 06 Jan 2023
Viewed by 2167
Abstract
For larger-scale quantum information processing, qubit reset plays an important role, as the coherent times for qubits are limited. However, previous schemes require either long reset times or a complex pulse calibration technique, leading to low efficiency in qubit reset. Here, we propose [...] Read more.
For larger-scale quantum information processing, qubit reset plays an important role, as the coherent times for qubits are limited. However, previous schemes require either long reset times or a complex pulse calibration technique, leading to low efficiency in qubit reset. Here, we propose a fast and simple reset protocol for superconducting transmon qubits based on the coupler-coupled qubits architecture. In this setup, a mixing pulse is used to transfer the qubit excitation to the combined excitation of a low-qulity coupler and readout resonator, which will quickly decay to their respectively ground states, leading to efficient qubit reset to the ground state. Our numerical results show that the residual population of the qubit’s excited state can be suppressed to 0.04% within 28 ns; the reset time will be 283 ns if photon depletion of the readout resonator is required. Thus, our protocol provides a promising way for the high-efficiency superconducting qubit reset. Full article
(This article belongs to the Special Issue Superconducting Quantum Computing and Devices)
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17 pages, 4257 KiB  
Article
Quasi-Shor Algorithms for Global Benchmarking of Universal Quantum Processors
by Genting Dai, Kaiyong He, Changhao Zhao, Yongcheng He, Jianshe Liu and Wei Chen
Appl. Sci. 2023, 13(1), 139; https://doi.org/10.3390/app13010139 - 22 Dec 2022
Cited by 1 | Viewed by 1213
Abstract
This work generalizes Shor’s algorithm into quasi-Shor algorithms by replacing the modular exponentiation with alternative unitary operations. By using the quantum circuits to generate Bell states as the unitary operations, a specific example called the Bell–Shor algorithm was constructed. The system density matrices [...] Read more.
This work generalizes Shor’s algorithm into quasi-Shor algorithms by replacing the modular exponentiation with alternative unitary operations. By using the quantum circuits to generate Bell states as the unitary operations, a specific example called the Bell–Shor algorithm was constructed. The system density matrices in the quantum circuits with four distinct input states were calculated in ideal conditions and illustrated through chromatic graphs to witness the evolution of quantum states in the quantum circuits. For the real part of the density matrices, it was revealed that the number of zero elements dramatically declined to only a few points after the operation of the inverse quantum Fourier transformation. Based on this property, a protocol constituting a pair of error metrics Γa and Γb is proposed for the global benchmarking of universal quantum processors by looking at the locations of the zero entries and normalized average values of non-zero entries. The protocol has polynomial resource requirements with the scale of the quantum processor. The Bell–Shor algorithm is capable of being a feasible setting for the global benchmarking of universal quantum processors. Full article
(This article belongs to the Special Issue Superconducting Quantum Computing and Devices)
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8 pages, 2737 KiB  
Article
Measurement of Quasiparticle Diffusion in a Superconducting Transmon Qubit
by Yuqian Dong, Yong Li, Wen Zheng, Yu Zhang, Zhuang Ma, Xinsheng Tan and Yang Yu
Appl. Sci. 2022, 12(17), 8461; https://doi.org/10.3390/app12178461 - 24 Aug 2022
Cited by 2 | Viewed by 1453
Abstract
Quasiparticles, especially the ones near the Josephson junctions in the superconducting qubits, are known as an important source of decoherence. By injecting quasiparticles into a quantum chip, we characterized the diffusion feature by measuring the energy relaxation time and the residual excited-state population [...] Read more.
Quasiparticles, especially the ones near the Josephson junctions in the superconducting qubits, are known as an important source of decoherence. By injecting quasiparticles into a quantum chip, we characterized the diffusion feature by measuring the energy relaxation time and the residual excited-state population of a transmon qubit. From the extracted transition rates, we phenomenologically modeled the quasiparticle diffusion in a superconducting circuit that contained “hot” nonequilibrium quasiparticles in addition to low-energy ones. Full article
(This article belongs to the Special Issue Superconducting Quantum Computing and Devices)
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