Comparison of entangling protocols in ABC-type spin chains

TL;DR

This paper compares the robustness of three entangling protocols in a dimerised spin chain device, analyzing their performance against fabrication and operation errors for quantum applications.

Contribution

It provides a comparative analysis of different entangling protocols in a spin chain device, focusing on their robustness to practical errors.

Findings

Protocols show varying robustness to fabrication errors.

Timing delays significantly affect entanglement quality.

Some protocols are more resilient than others under realistic conditions.

Abstract

In this contribution we consider an advantageous building block with potential for various quantum applications: a device based on coupled spins capable of generating and sharing out an entangled pair of qubits. Our model device is a dimerised spin chain with three weakly coupled embedded sites (defects). Three different entangling protocols were proposed for this chain in [1] and [2], one producing a Cluster state and two generating a Bell state, depending on the initial state injection. Here we compare the robustness of such protocols as quantum entangling gates against different types of fabrication (static energy fluctuations) and operation (timing injection delays) errors.