Summary
The superconducting quantum computing architecture has seen rapid improvements over the last two decades. However, the coherence time of superconducting qubits is limited by unknown noise sources presumably existent at the interface between the insulator and the superconducting film. Carbon nanotubes (CNTs) are a promising material for use in Josephson-Junctions (JJs) given their unique properties, such as high electrical conductivity, pristine surface, inherent nanoscale dimension, and silicon-compatible processing. In this project, we are building gate-controlled JJs composed of CNT thin films (down-to-monolayer) positioned between two superconducting electrodes to act as a promising superconducting qubit for quantum computers. Aside from gate-controllability, this approach offers superb interface engineering capability, small integration footprint, and high-temperature operation. We expect the CNT film – JJ superconducting qubit will achieve superior performance relative to current state-of-the-art JJs and enable the development of scalable superconducting computation with extensions to arrays of CNT-JJs coupled to microwave and optical photon-waveguides.
Figure 1. Cooper pairs interacting with gate-controlled Jospehson-Junctions composed of CNT thin films
Related Content
Spin Generation and High-Frequency Detection via the Quantum Nonlinear Anomalous Hall Effect in Weyl Semimetals
In magnetic conductors, the passage of current yields an electric field in the transverse direction even without an external magnetic field – this is known as the anomalous Hall effect (AHE). This effect can act as a convenient probe of spin ordering, magnetic textures, spin-orbit coupling, and band topology in solids, and can be further […]
April 19, 2023
Folk Understanding of Quantum Physics
Summary It is often said that quantum concepts are counterintuitive. However, quantum concepts may not be equally counterintuitive to people from all cultural backgrounds. As cultural psychologists have discovered, culture fundamentally shapes the way people make sense of the world. In particular, the last few decades of research have documented cultural differences in appreciation of […]
March 24, 2021
Tuning Spin-Exchange Interactions in Low-Dimensional Metal Halide Perovskites: A New Class of Semiconductor Quantum Materials
Summary Leakage current in electronic components is one of the limiting factors for the performance of conventional computers which use charges and currents as physical information carriers. Spintronics offers an alternative by using electron spin for information transfer, processing and storage, enabling the design of non-volatile computer memory and more energy-efficient electronic devices. In this […]
October 1, 2019
Developing Tools for Quantum Characterization and Validation
Summary Coherence is essential for quantum computation; yet it introduces a unique sensitivity to any imperfections in hardware design, control systems, and the operating environment. Overcoming these sensitivities requires a hierarchy of strategies, ranging from optimization of the hardware architecture to software solutions including quantum error correction. Randomized Benchmarking Protocols are an important family of […]
October 3, 2017