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Highly photon loss tolerant quantum computing using hybrid qubits

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arxiv 2011.04209 v1 pith:5RYOX6YI submitted 2020-11-09 quant-ph

Highly photon loss tolerant quantum computing using hybrid qubits

classification quant-ph
keywords quantumlossphotonschemecomparedcomputationcomputinghybrid
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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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 {\it et al}. [Phys. Rev. Lett. 125, 060501 (2020)] can be improved further by employing postselection and multi-Bell-state-measurement based entangling operation to create a special cluster state, known as Raussendorf lattice for topological quantum computation. In particular, the photon loss threshold is enhanced up to $5.7\times10^{-3}$, 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 to the scheme in the aforementioned reference. Neverthless, this scheme remains resource-efficient compared to other known optical schemes for fault-tolerant quantum computation.

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