**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.

## Related Content

## Composite Superconductors for Improved Quantum Coherence

Summary Conventional superconductors have trouble performing well in magnetic fields required for electron spin resonance (ESR) – based quantum information processing applications. We can, however, use proximity engineering to select desired properties from different materials and combine them for improved superconducting performance in magnetic fields — an improvement that would have strong implications for […]

December 12, 2018

## Engineering and Characterizing Programmable Interaction Graphs in a Trapped Ion Quantum Simulator

Summary Quantum simulators have the potential to bring unprecedented capabilities in areas such as the discovery of new materials and drugs. Engineering precise and programmable interaction graphs between qubits or spins forms the backbone of simulator applications. The trapped ion system is unique in that the interaction graph between qubits can be programmed, in […]

July 24, 2018

## Spin-transfer Torque Magnetic Random Access Memory for On-chip Spin Information Storage

Summary Leakage power in semiconductor memories, such as Dynamic Random Access Memory (DRAM) and Static Random Access Memory (SRAM), can be substantial and is one of the limits for scalability of classical electronics. This is attributed to the fact that the information stored is volatile, requiring constant refreshing, as well as reprogramming upon powering […]

August 6, 2018

## Quantum Dynamics of Cavity Interactions with Spin Ensembles

Summary High quality factor cavities can be powerful control elements for ensembles of spins, enabling unitary control as well as on demand cooling. They can also be used to couple two otherwise non-interacting ensembles. The goal of the project is to explore the physics and engineering of such systems both theoretically and experimentally. The laboratory contains a […]

September 7, 2016