Deterministic Generation of Entangled Photonic Cluster States from Quantum Dot Molecules

Successful generation of photonic cluster states is the key step in realization of measurement-based quantum computation and quantum network protocols. Several proposals have been put forward for the generation of such entangled states from (a) deterministic sources of photon emission and (b) probabilistic approaches such as spontaneous parametric down-conversion. However, even the protocols based on the deterministic photon-emission sources come with their own challenges in terms of both conception and implementation. In this work, we propose deterministic generation of these photonic cluster states from a spin-photon interface based on a hole-spin qubit hosted in a quantum dot molecule. Our protocol resolves many of the difficulties of existing proposals and paves the way for an experimentally feasible realization of highly entangled multiqubit photonic states with both a high production rate and a fidelity more than double that available from current comparable schemes.

Automated summary

This article proposes a method for the deterministic generation of photonic cluster states from hole-spin qubits, which resolves the difficulties of existing proposals and has a high production rate and a fidelity more than double that of current comparable schemes, paving the way for the experimental realization of highly entangled multiqubit photonic states.