Machine-Guided Design of Oxidation-Resistant Superconductors for Quantum Information Applications

  title={Machine-Guided Design of Oxidation-Resistant Superconductors for Quantum Information Applications},
  author={Carson Koppel and Brandon Wilfong and Allana Iwanicki and Elizabeth J Hedrick and Tanya Berry and Tyrel M.McQueen},
Decoherence in superconducting qubits has long been attributed to two-level systems arising from the surfaces and interfaces present in real devices. A recent significant step in reducing decoherence was the replacement of superconducting niobium by superconducting tantalum, resulting in a tripling of transmon qubit lifetimes (T1). The identity, thickness, and quality of the native surface oxide, is thought to play a major role, as tantalum only has one oxide whereas niobium has several. Here… 

Figures and Tables from this paper

Chemical Profiles of the Oxides on Tantalum in State of the Art Superconducting Circuits.

Over the past decades, superconducting qubits have emerged as one of the leading hardware platforms for realizing a quantum processor. Consequently, researchers have made significant effort to

Introduction of spin centers in single crystals of Ba2CaWO6−δ

Developing the field of quantum information science (QIS) hinges upon designing viable qubits, the smallest unit in quantum computing. One approach to creating qubits is introducing paramagnetic

Towards practical quantum computers: transmon qubit with a lifetime approaching 0.5 milliseconds

Here we report a breakthrough in the fabrication of a long lifetime transmon qubit. We use tantalum films as the base superconductor. By using a dry etching process, we obtained transmon qubits with

New material platform for superconducting transmon qubits with coherence times exceeding 0.3 milliseconds

Two-dimensional transmon qubits are fabricated that have both lifetimes and coherence times with dynamical decoupling exceeding 0.3 milliseconds by replacing niobium with tantalum in the device, indicating that these material improvements are robust, paving the way for higher gate fidelities in multi-qubit processors.

Quantum guidelines for solid-state spin defects

Defects with associated electron and nuclear spins in solid-state materials have a long history relevant to quantum information science that goes back to the first spin echo experiments with silicon

Generalized scaling of spin qubit coherence in over 12,000 host materials

  • S. KanaiF. Heremans H. Ohno
  • Physics, Materials Science
    Proceedings of the National Academy of Sciences of the United States of America
  • 2022
Significance Atomic defects in solid-state materials are promising candidates as quantum bits, or qubits. New materials are actively being investigated as hosts for new defect qubits; however, there

Identifying candidate hosts for quantum defects via data mining

This work systematically evaluates the suitability of host materials by applying a combined four-stage data mining and manual screening process to all entries in the Materials Project database, with literature-based experimental confirmation of band gap values.

High-entropy alloy superconductors: Status, opportunities, and challenges

High entropy alloys (HEAs) are a recently-opened research area in materials science and condensed matter physics. Although 3d-metal-based HEAs have already been the subject of many investigations,

A fast turn-around time process for fabrication of qubit circuits

The authors describe a process for fabrication of Nb/AlO/sub x//Nb Josephson junction circuits for quantum computation. The process involves only one etch step and incorporates electron beam

Materials challenges and opportunities for quantum computing hardware

A comprehensive review of materials issues in each physical platform for quantum information processing (QIP) is provided, describing the evidence that has led to the current understanding of each problem and proposing how to tackle these problems.