High-fidelity realisation of CNOT gate in Majorana-based optical platform

TL;DR

This paper demonstrates a high-fidelity CNOT gate using Majorana zero modes simulated on a photonic platform, showcasing resilience to noise and advancing topological quantum computing.

Contribution

It introduces a novel photonic implementation of Majorana-based CNOT gates with fidelity exceeding 0.992, highlighting practical progress in topological quantum computation.

Findings

CNOT gate fidelity surpasses 0.992

Majorana braiding operations implemented in photonics

Resilience to noise enhances quantum gate performance

Abstract

We present the experimental realisation of a robust CNOT quantum gate using Majorana zero modes simulated on a photonic platform. Three Kitaev chains supporting Majorana zero modes at their endpoints are used to encode two logical qubits, and both intra-chain and inter-chain braiding operations are performed to implement the CNOT gate. While the topological encoding of quantum information in Majorana fermions does not offer full topological protection in our non-interacting photonic setting, it nevertheless exhibits a natural resilience to the dominant noise and decoherence effects present in the experiment. Consequently, the fidelity of the CNOT gate is significantly enhanced, surpassing 0.992 and addressing a key limitation in the path toward scalable quantum computation. These results represent a major advancement in topological quantum computing with Majorana fermions and underscore the potential of photonic platforms for realising high-fidelity quantum gates.