Laser-annealing Josephson junctions for yielding scaled-up superconducting quantum processors

JB Hertzberg, EJ Zhang, S Rosenblatt… - npj Quantum …, 2021 - nature.com
As superconducting quantum circuits scale to larger sizes, the problem of frequency
crowding proves a formidable task. Here we present a solution for this problem in fixed …

Diabatic gates for frequency-tunable superconducting qubits

R Barends, CM Quintana, AG Petukhov, Y Chen… - Physical review …, 2019 - APS
We demonstrate diabatic two-qubit gates with Pauli error rates down to 4.3 (2)× 10-3 in as
fast as 18 ns using frequency-tunable superconducting qubits. This is achieved by …

Extensive characterization and implementation of a family of three-qubit gates at the coherence limit

CW Warren, J Fernández-Pendás, S Ahmed… - npj Quantum …, 2023 - nature.com
While all quantum algorithms can be expressed in terms of single-qubit and two-qubit gates,
more expressive gate sets can help reduce the algorithmic depth. This is important in the …

Time-efficient qudit gates through incremental pulse re-seeding

LM Seifert, J Chadwick, A Litteken… - 2022 IEEE …, 2022 - ieeexplore.ieee.org
Current efforts to build quantum computers focus mainly on the two-state qubit, which often
involves suppressing readily-available higher states. In this work, we break this abstraction …

Pansatz: Pulse-based ansatz for variational quantum algorithms

D Meirom, SH Frankel - Frontiers in Quantum Science and …, 2023 - frontiersin.org
Quantum computers promise a great computational advantage over classical computers,
which might help solve various computational challenges such as the simulation of …

Mitigation of quantum crosstalk in cross-resonance-based qubit architectures

P Zhao - Physical Review Applied, 2023 - APS
The cross-resonance gate (cr gate) architecture that exploits fixed-frequency transmon
qubits and fixed couplings is a leading candidate for quantum computing. Nonetheless …

High-fidelity control of superconducting qubits using direct microwave synthesis in higher Nyquist zones

WD Kalfus, DF Lee, GJ Ribeill, SD Fallek… - IEEE Transactions …, 2020 - ieeexplore.ieee.org
Control electronics for superconducting quantum processors have strict requirements for
accurate command of the sensitive quantum states of their qubits. Hinging on the purity of …

Realization of high-fidelity perfect entangler between remote superconducting quantum processors

J Song, S Yang, P Liu, HL Zhang, GM Xue… - arXiv preprint arXiv …, 2024 - arxiv.org
Superconducting qubits, a promising candidate for universal quantum computing, currently
face limitations in chip size due to reproducibility, wiring complexity, and packaging modes …

Characterizing a four-qubit planar lattice for arbitrary error detection

JM Chow, SJ Srinivasan, E Magesan… - Quantum …, 2015 - spiedigitallibrary.org
Quantum error correction will be a necessary component towards realizing scalable
quantum computers with physical qubits. Theoretically, it is possible to perform arbitrarily …