The future of quantum computing relies on having qubits with sufficiently good quality. Specifically, the error per operation needs to be below a certain threshold before we are able to track errors in real time and subsequently correct for any potential errors. In the Andersen lab, we will be addressing the challenge of achieving the highest performance qubits through novel qubit designs.
Protected Superconducting Qubits
A recent development in the field of superconducting quantum circuits is to focus on a new class of quantum bits (qubits), the building block of quantum computers, that are intrinsically less susceptible to errors. The class of qubits that we focus on currently in the Andersen lab are known as fluxonium qubits and they have shown record high coherence times based on their intrinsic error protection. For this intrinsic protection to be efficient and robust, it is necessary that errors are exponentially suppressed.
Hybrid Semiconductor/Superconducting Qubits
Spin qubits in semiconductors and transmon qubits in superconducting circuits are two of the most promising platforms for quantum computing. Spin qubits are small in size and are compatible with industrial semiconductor processing. Transmon-based circuits currently boast some of the largest numbers of qubits on a single chip with readily available control, readout and long-distance interactions. Combining the two provide new approaches to protected qubits and may provide aspects of topological protected qubits.