On Distributed Quantum Computing with Distributed Fan-Out Operations

TL;DR

This paper compares various distributed quantum circuit implementations, emphasizing the benefits of distributed fan-out operations with GHZ states for reducing circuit depth and resource use, proposing them as potential primitives for distributed quantum computing.

Contribution

It introduces the concept of distributed fan-out operations as a new primitive, highlighting their advantages over entangled pairs in distributed quantum circuits.

Findings

Distributed fan-out operations reduce circuit depth.

Distributed GHZ states could serve as a new primitive.

Potential resource savings in distributed quantum computing.

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.