Experimentally generating and tuning robust entanglement between photonic qubits

TL;DR

This paper demonstrates the experimental generation and tuning of highly robust entangled states among three photonic qubits, achieving high fidelity and controllable entanglement configurations.

Contribution

It introduces a method to coherently control the entanglement state of three photonic qubits, including the highest reported fidelity of W states.

Findings

Successfully generated high-fidelity W states.

Controlled transition from separable to maximally entangled states.

Achieved the highest reported fidelity for W states.

Abstract

We generate and study the entanglement properties of novel states composed of three polarisation-encoded photonic qubits. By varying a single experimental parameter we can coherently move from a fully separable state to a maximally robust W state, while at all times preserving an optimally robust, symmetric entanglement configuration. We achieve a high fidelity with these configurations experimentally, including the highest reported W state fidelity.