A quantum gate architecture via teleportation and entanglement II: Physical implementation and error thresholds

We propose a novel physical implementation of logical qubits and operations for photonic quantum computing, based on our architecture QGATE (Quantum Gate Architecture via Teleportation and Entanglement). QGATE combines the measurement-driven paradigm of measurement-based quantum computing with the dynamic entanglement generation of the circuit model, enabling flexible and scalable quantum logic. We describe the physical realization of QGATE's three core primitives: Clifford operations, ancilla qubits, and arbitrary-angle single-qubit measurements, with particular emphasis on the challenges and future directions for the latter. Our approach employs a dual entanglement generation strategy—photonic boosted fusion and quantum emitter-mediated entanglement—which enables error thresholds for failed fusion as high as 20% (corresponding to an 80% success rate for boosted fusion) for foliated logical qubits. This hybrid strategy significantly advances the feasibility of fault-tolerant photonic quantum computing.