SDQC: Distributed Quantum Computing Architecture Utilizing Entangled Ion Qubit Shuttling

TL;DR

The paper introduces SDQC, a scalable hybrid quantum computing architecture that combines ion qubit shuttling and distributed quantum computing, achieving high fidelity, parallelism, and improved performance for complex problems.

Contribution

It presents a practical SDQC architecture with error correction, pipelining strategies, and performance evaluation, demonstrating advantages over existing architectures in speed and error rates.

Findings

Achieves a logical error rate of approximately 1.2e-8 for a 256-bit ECDLP problem.

Provides 2.82 times faster logical clock speed than QCCD architecture.

Demonstrates effective integration of shuttling and distributed quantum computing techniques.

Abstract

We propose Shuttling-based Distributed Quantum Computing (SDQC), a hybrid architecture that combines the strengths of physical qubit shuttling and distributed quantum computing to enable scalable trapped-ion quantum computing. SDQC performs non-local quantum operations by distributing entangled ion qubits via deterministic shuttling, combining the high-fidelity and deterministic operations of shuttling-based architectures with the parallelism and pipelining advantages of distributed quantum computing. We present (1) a practical architecture incorporating quantum error correction (QEC), (2) pipelining strategies to exploit parallelism in entanglement distribution and measurement, and (3) a performance evaluation in terms of logical error rate and clock speed. For a 256-bit elliptic-curve discrete logarithm problem (ECDLP) instance, which requires 2,871 logical qubits at code distance 13, SDQC achieves a logical error rate which is $1.20^{+0.94}_{-0.45}\times10^{-8}$ of Photonic DQC error rate and $3.79^{+5.09}_{-2.84}\times10^{-3}$ of Quantum Charge-Coupled Device (QCCD) error rate, while providing 2.82 times faster logical clock speed than QCCD.