Summary
Superconducting quantum bits, or qubits, use circuits made from superconducting materials to harness quantum mechanical states. These devices contain many atoms, but can behave as simple, controllable qubits. We are building technologies for the control and measurement of superconducting qubits to enable the first demonstration of an extensible, medium-scale quantum processor. Our approach includes the development of multilayer architectures where qubit and wiring circuitry are fabricated on different chips that are bonded together by means of thermocompression bonding technologies. This will make it possible to address qubits on a two-dimensional lattice on the order of 100 qubits. Implementing a two-dimensional array of superconducting qubits will allow for the realization of quantum-error correction, a critical step on the way to a fully scalable architecture. Through this work we also hope to study the loss mechanisms that limit the coherence time of superconducting qubits.
![](https://tqt.uwaterloo.ca/wp-content/uploads/2018/01/Extensible-Technology-300x225.png)
Figure 1. Two chips bonded with indium forming a tunnel for superconducting qubits (credit C.R.H. McRae and M. Mariantoni 2017).
Related Content
![Mesoscopic systems as coherent control elements](https://tqt.uwaterloo.ca/wp-content/uploads/2016/09/Screen-Shot-2020-06-02-at-1.19.51-PM.png)
Mesoscopic systems as coherent control elements
Summary Mesoscopic systems provide a new tool for quantum systems design. In particular, they are enabling of robust quantum control. Here “mesoscopic system” refers to a connected network where each element, if studied alone, would be a quantum bit. The network is too big to be treated fully quantum mechanically. We do not have individual […]
September 1, 2016
![Cryo-CMOS to Control and Operate 2D Fault-Tolerant Qubit Network](https://tqt.uwaterloo.ca/wp-content/uploads/2018/06/WeiFigure.jpg)
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
Advanced microwave electronics enabling quantum technologies
Summary Superconducting quantum computers require quantum-limited measurements at microwave frequencies in order to implement error correction. Conventionally, this is accomplished using near quantum-limited Josephson Parametric Amplifiers (JPAs). The JPAs require bulky ferrite-based circulators that prevent on-chip integration of the amplifiers with the processor and take up the majority of space and cooling power in the […]
April 1, 2020
![Entangled Photon Orbital Angular Momentum Arrays](https://tqt.uwaterloo.ca/wp-content/uploads/2019/09/Picture1_190919.png)
Entangled Photon Orbital Angular Momentum Arrays
Summary Arrays of orbital angular momentum (OAM) states of light are a new form of structured light so far relatively unexplored in quantum information science. Unlike spin angular momentum of light, which is related to light’s polarization and covers two dimensions, OAM states, sometimes described as ‘donut beams’ due to the shape of the field […]
September 19, 2019