Fault-tolerance is essential to the performance of quantum technologies, but known schemes are extremely resource intensive. Thus, improving existing schemes or inventing new schemes is of central importance. This joint project is based on the realization that fault-tolerance schemes make use of symmetries in fundamental ways, and that studying the problem of fault tolerance broadly from a symmetry perspective may offer valuable insights. We will do so by focusing on fault-tolerance and control-error mitigation primitives that make explicit use of symmetries, and unveil fundamental connections between the two. This involves the study of decoherence and error control, and measures that counteract them in two settings: fault-tolerant universal quantum computation (FTQC) using magic state distillation; and computational phases of matter. We will address which types of symmetries lead to computationally universal phases of matter, and the minimum operational cost of fault-tolerant universal quantum computation. This work is a collaboration between the research groups of David Poulin, Robert Raussendorf, and Beni Yoshida from the University of Sherbrooke, University of British Columbia and the Perimeter Institute, respectively. Results from this project will shed light on which order parameters of condensed matter systems are important for quantum information processing and quantum sensing, and how to assess and reduce the overhead requirements for fault-tolerant quantum computation via understanding the process of magic-state distillation.
Cryo-CMOS to Control and Operate 2D Fault-Tolerant Qubit Network
Summary Large-scale, fault-tolerant quantum computation requires precise and stable control of individual qubits. This project will use complementary metal-oxide-semiconductor (CMOS) technology to provide a cost-effective scalable platform for reliable and high-density control infrastructure for silicon spin qubits. We will use sub-micron CMOS technology to address device and circuit-level challenges and explore the integration of […]
June 14, 2018
Implementing High-fidelity Quantum Gates in Multi-level Trapped Ions
Summary The scalability of quantum processors is limited by current error rates for single-qubit gates. By encoding more than a single bit of information within a single ion, multi-level “qudits” offer a promising method of increasing the information density within a quantum processor, and therefore minimizing the number of gates and associated error rates. […]
July 30, 2018
Quantum Sensing with Small Quantum Systems
Summary There are small quantum systems over which we have very good control and which have long lifetimes. Examples include the phosphorous (P) defect in silicon (Si) and the nitrogen vacancy (NV) defect in diamond. With P defect in Si, we focus on improving our understanding of the hyperpolarization mechanism to better enable engineering of […]
December 1, 2016
Fabrication of Ultra Low Noise RF SQUID Amplifiers
A superconducting quantum interference device (SQUID) is an extremely sensitive magnetic field detector.
June 1, 2017