3/ Precision in manipulation: With the ability to be manipulated with high precision, photons have enabled high-fidelity single-qubit operations for decades. arxiv.org/abs/quant-ph...

Precise Creation, Characterization, and Manipulation of Single...

We present the theoretical basis for and experimental verification of arbitrary single-qubit state generation, using the polarization of photons generated via spontaneous parametric...

4/ Quantum communication: Photons are required anyway for quantum communication over optical networks, and distributed or modular computing approaches using optical links.