Alladi Ramakrishnan Hall

Resource-efficient fault tolerant quantum computation with hybrid entanglement of light

Omkar Srikrishna

Seoul National University, South Korea

We propose an all-linear-optical scheme to ballistically generate a cluster state for measurement-based topological fault-tolerant quantum computation using hybrid photonic qubits entangled in a continuous-discrete domain. Availability of near-deterministic Bell-state measurements on hybrid qubits is exploited for the purpose. In the presence of photon losses, we show that our scheme leads to a significant enhancement in both tolerable photon-loss rate and resource overheads. More specifically, we report a photon-loss threshold of 3.3x10^{-3}, which is higher than those of known optical schemes under a reasonable error model.

Furthermore, resource overheads to achieve low logical error rate is significantly less by multiple orders of magnitude compared to other reported values in the literature.