Highly photon-loss-tolerant quantum computing using hybrid qubits

We investigate a scheme for topological quantum computing using optical hybrid qubits and make an extensive comparison with previous all-optical schemes. We show that the photon loss threshold reported by Omkar et al. [Phys. Rev. Lett. 125, 060501 (2020)] can be improved further by employing postselection and multi-Bell-state-measurement-based entangling operations to create a special cluster state, known as Raussendorf lattice for topological quantum computation. In particular, the photon loss threshold is enhanced up to 5.7 x 10(-3), which is the highest reported value given a reasonable error model. This improvement is obtained at the price of consuming more resources by an order of magnitude compared with the scheme in the aforementioned reference. Nevertheless, this scheme remains resource-efficient compared with other known optical schemes for fault-tolerant quantum computation.

Automated summary

We investigate a scheme for topological quantum computing using optical hybrid qubits and show an improved photon loss threshold. By creating a special cluster state, known as Raussendorf lattice, the threshold is enhanced up to 5.7 x 10(-3). Although this improvement comes with increased resource consumption compared to previous schemes, it remains more resource-efficient compared to other known optical schemes for fault-tolerant quantum computation.