Quantum Computer Architecture

Scaling bottlenecks the making of digital quantum computers, posing challenges from both the quantum and the classical components. We …

The intersection of quantum hardware and software is epitomized in the quantum instruction set, a pivotal factor in system performance. We have been at the vanguard of designing and implementing quantum instruction sets that optimize system efficiency. Our PMW (Phase-shifted MicroWave) scheme has gained widespread adoption in the industry. Notably, our SQiSW (Square Root of iSWAP) scheme has been published in the prestigious Physical Review Letters and then adopted by Google. Furthermore, our recent AshN scheme has been accepted by ASPLOS24 and is currently being implemented by several leading hardware teams.

We developed a prototype system, a trailblazer in supporting fault-tolerant quantum computing. Its design ingeniously addresses scalability, ensuring that control overhead does not increase with the number of qubits. Integrated with our modular decoding firmware, this system demonstrates unparalleled scalability potential in the realm of fault-tolerant quantum computing. We have established and rigorously tested a comprehensive end-to-end system using our in-house fluxonium quantum chip. This work has been recognized and published in the ACM Transactions on Quantum Computing.

Fast classical processing is essential for most quantum fault-tolerance architectures. We pioneered the slicing-window parallel decoding approach that provides fast classical processing for the surface code through parallelism. This scheme significantly accelerates classical processing by leveraging parallelism, effectively overcoming a major bottleneck in fault-tolerant quantum computing for the first time. Our work has garnered widespread recognition within the scientific community. It has been featured in presentations at leading institutions like MIT and Duke. Additionally, our team has been honored with an invitation to speak at the QEC23, a prominent conference on quantum error correction.