Enabling Full-Stack Quantum Computing with Changeable Error-Corrected Qubits

TL;DR

This paper introduces CECQ, a framework for full-stack fault-tolerant quantum computing using changeable logical qubits, addressing key challenges in dynamic qubit implementation, timing, and system performance.

Contribution

The paper proposes CECQ, a novel approach that enables dynamic logical qubits for FTQC, solving critical problems in hardware implementation, timing, and performance optimization.

Findings

CECQ effectively supports various quantum programs.

It improves system performance for different program features.

Demonstrates feasibility of changeable logical qubits in FTQC.

Abstract

Executing quantum applications with quantum error correction (QEC) faces the gate non-universality problem imposed by the Eastin-Knill theorem. As one resource-time-efficient solution, code switching changes the encoding of logical qubits to implement universal logical gates. Unfortunately, it is still unclear how to perform full-stack fault-tolerant quantum computing (FTQC) based on the changeable logical qubit. Specifically, three critical problems remain unsolved: a) how to implement the dynamic logical qubit on hardware; b) how to determine the appropriate timing for logical qubit varying; c) how to improve the overall system performance for programs of different features. To overcome those design problems, We propose CECQ, to explore the large design space for FTQC based on changeable logical qubits. Experiments on various quantum programs demonstrate the effectiveness of CECQ.