On Distributed Quantum Computing with Distributed Fan-Out Operations

2026-01-21

AI Summary

Distributed quantum computing faces significant challenges, including high communication overhead, deep circuit depth, and substantial entanglement resource consumption. This work proposes employing distributed fan-out operations—realized via GHZ states—as a fundamental primitive to replace conventional approaches that rely solely on entangled pairs, thereby enabling more efficient distributed quantum circuits. By designing a novel circuit architecture, analyzing GHZ state generation and utilization, and evaluating both entanglement requirements and communication complexity, the study demonstrates that incorporating distributed fan-out operations can substantially reduce circuit depth and potentially lower overall entanglement consumption. These findings establish a new paradigm for the design of efficient distributed quantum protocols.

Technology Category

• Search and Optimization: Distributed Search
• Constraint Satisfaction and Optimization: Distributed CSP/Optimization
• Machine Learning: Quantum Machine Learning

Application Category

• Security and Privacy: Blockchains and distributed ledgers
• Economics, Online Markets and Human Computation: Incentives in network design for Web infrastructures and ecosystems
• Graph Algorithms and Modeling for the Web: Efficient manipulation of static and dynamic Web-related graphs

Abstract

We compare different circuits implementing distributed versions of quantum computations, using entangled pairs only, and using distributed fan-out operations (using GHZ states). We highlight the advantages of using distributed fan-out operations in terms of reductions in circuit depth and (possibly) entanglement resources. We note that distributed fan-out operations (or notably, distributed GHZ states) could be a ``primitive''building block for distributed quantum operations in the same way as entangled pairs are, if distributed GHZ states could be realized efficiently.

Problem

• Distributed Quantum Computing
• Distributed Fan-Out
• GHZ states
• Entanglement Resources
• Circuit Depth

Innovation

• distributed quantum computing
• distributed fan-out
• GHZ states
• circuit depth reduction
• entanglement resources