Unconditionally teleported quantum gates between remote solid-state qubit registers

Researchers at Delft University demonstrate an unconditional CNOT quantum gate teleported between two remote diamond NV-center qubit registers using real-time feedforward and no post-selection. Each node uses a two-qubit register (NV electron spin + Carbon-13 nuclear spin) cooled in separate cryostats connected by 2m of optical fiber. The team achieves genuine 4-partite GHZ entanglement with 64% fidelity and a teleported CNOT gate with ~63% entangled state fidelity, both without post-selection. Key innovations include DC Stark tuning for photon indistinguishability, DDRF nuclear spin control, and improved phase tracking during network activity. Results advance modular quantum computing architectures and distributed quantum network protocols.