123 citations · 737 across the 23 of their papers we have counts for
8 papers · 1 filter
Systematic Improvements in Transmon Qubit Coherence Enabled by Niobium Surface Encapsulation
Mustafa Bal, Akshay A. Murthy, Shaojiang Zhu +37
We present a novel transmon qubit fabrication technique that yields systematic improvements in T relaxation times. We fabricate devices using an encapsulation strategy that inv…
Implementing two-qubit gates at the quantum speed limit
Joel Howard, Alexander Lidiak, Casey Jameson +8
The speed of elementary quantum gates, particularly two-qubit gates, ultimately sets the limit on the speed at which quantum circuits can operate. In this work, we experimentally d…
A universal quantum gate set for transmon qubits with strong ZZ interactions
Junling Long, Tongyu Zhao, Mustafa Bal +13
High-fidelity single- and two-qubit gates are essential building blocks for a fault-tolerant quantum computer. While there has been much progress in suppressing single-qubit gate e…
Merged-element transmon
R. Zhao, S. Park, T. Zhao +4
Transmon qubits are ubiquitous in the pursuit of quantum computing using superconducting circuits. However, they have some drawbacks that still need to be addressed. Most important…
Dielectric loss extraction for superconducting microwave resonators
C. R. H. McRae, R. E. Lake, J. L. Long +6
The investigation of two-level-state (TLS) loss in dielectric materials and interfaces remains at the forefront of materials research in superconducting quantum circuits. We demons…
Kinetic Inductance Traveling Wave Amplifiers For Multiplexed Qubit Readout
Leonardo Ranzani, Mustafa Bal, Kin Chung Fong +7
We describe a kinetic inductance traveling-wave (KIT) amplifier suitable for superconducting quantum information measurements and characterize its wideband scattering and noise pro…