A5083237305- Quantum Information and Cryptography
- Quantum Computing Algorithms and Architecture
- Quantum and electron transport phenomena
- Photonic and Optical Devices
- Physics of Superconductivity and Magnetism
- Superconducting Materials and Applications
- Particle accelerators and beam dynamics
- Quantum Mechanics and Applications
- Acoustic Wave Resonator Technologies
- Superconducting and THz Device Technology
- Theoretical and Computational Physics
- Advancements in Semiconductor Devices and Circuit Design
- Optical Network Technologies
- Spectroscopy and Quantum Chemical Studies
- Microwave and Dielectric Measurement Techniques
- Radio Frequency Integrated Circuit Design
- Microwave Engineering and Waveguides
University of Waterloo
2016-2024
Quantum computing architectures are on the verge of scalability, a key requirement for implementation universal quantum computer. The next stage in this quest is realization error correction codes, which will mitigate impact faulty information Architectures with ten or more bits (qubits) have been realized using trapped ions and superconducting circuits. While these implementations potentially scalable, true scalability require systems engineering to combine classical hardware. One...
Quantum bits (qubits) with long coherence times are an important element for the implementation of medium- and large-scale quantum computers. In case superconducting planar qubits, understanding improving qubits' quality can be achieved by studying resonators. this paper, we fabricate characterize coplanar waveguide resonators made from aluminum thin films deposited on silicon substrates. We perform three different substrate surface treatments prior to deposition: one chemical treatment...
Superconducting quantum computers have long been plagued by defects causing unreliable performance. Here, the authors confirm fundamental mechanism behind unwanted time fluctuations: `hot' kick `colder' ones, which, in turn, randomly jolt qubits a device. This domino effect results jitter that prevents scientists from conducting ideal operations. Will it be possible to eliminate this jitter? The show here underlying physics is now well understood, key step towards remedying corresponding errors.
Extensible quantum computing architectures require a large array of bits operating with low error rates. A processor based on superconducting devices can be scaled up by stacking microchips that perform wiring, shielding, and computational functionalities. In this article, we demonstrate vacuum thermocompression bonding technology utilizes thin indium films as welding agent to attach pairs lithographically patterned chips. At 10 mK, find specific dc bond resistance 49.2 μΩ cm2. We show good...
Superconducting quantum computing is experiencing a tremendous growth. Although major milestones have already been achieved, useful quantum-computing applications are hindered by variety of decoherence phenomena. Decoherence due to two-level systems (TLSs) hosted amorphous dielectric materials ubiquitous in planar superconducting devices. We use high-quality quasilumped-element resonators as sensors investigate TLS-induced loss and noise. perform two-tone experiments with probe pump electric...
A practical quantum computer requires bit (qubit) operations with low error rates in extensible architectures. We study a packaging method that makes it possible to address hundreds of superconducting qubits by means three-dimensional wires: The large-scale socket. qubit chip is housed box, where both box and dimensions lead unwanted modes can interfere operations. theoretically analyze these interference effects the context coherent leakage. propose two methods mitigate resulting errors...
Scalable architectures characterized by quantum bits (qubits) with low error rates are essential to the development of a practical computer. In superconducting computing implementation, understanding and minimizing material losses crucial improvement qubit performance. A new that has recently received particular attention is indium, low-temperature superconductor can be used bond pairs chips containing standard aluminum-based circuitry. this work, we characterize microwave loss in indium...
In this study, we employ purity benchmarking (PB) to explore the dynamics of gate noise in a superconducting qubit system. Over 1110 h observations on an Xmon qubit, simultaneously measure coherence budget across two different operational frequencies. We find that incoherent errors, which predominate overall error rates, exhibit minimal frequency dependence, suggesting they are primarily due wideband, diffusive sources. contrast, coherent although less prevalent, show significant sensitivity...
Calibrating a quantum computer should not require days or weeks: A method is presented to accurately estimate parameters and evade noise much more efficiently than with any state-of-the-art technique.