Deterministic generation of multidimensional photonic cluster states using time-delay feedback

Cluster states are useful in many quantum information processing applications. In particular, universal measurement-based quantum computation (MBQC) utilizes two-dimensional cluster states [R. Raussendorf and H. J. Briegel, Phys. Rev. Lett. 86, 5188 (2001)] and topologically fault-tolerant MBQC requires cluster states of dimension 3 or higher [R. Raussendorf et al., New J. Phys. 9, 199 (2007)]. This work proposes a protocol to deterministically generate multidimensional photonic cluster states using a single atom-cavity system and time-delay feedback. The dimensionality of the cluster state increases linearly with the number of time-delay feedbacks. We first give a diagrammatic derivation of the tensor network states, which is valuable in simulating matrix product states and projected entangled pair states generated from sequential photons. Our method also provides a simple way to bridge and analyze the experimental imperfections and the logical errors of the generated states. In this method, we analyze the generated cluster states under realistic experimental conditions and address both one-qubit and two-qubit errors. Through numerical simulation, we observe an optimal atom-cavity cooperativity for the fidelity of the generated states, which is surprising given the prevailing assumption that higher-cooperativity systems are inherently better for photonic applications.

Automated summary

This study introduces a protocol for deterministically generating multidimensional photonic cluster states using a single atom-cavity system and time-delay feedback, where the dimensionality of the cluster state increases linearly with the number of time-delay feedbacks. The method is valuable for simulating matrix product states and projected entangled pair states, and for analyzing experimental imperfections and logical errors. Through numerical simulation, an optimal atom-cavity cooperativity for fidelity of the generated states is observed, challenging the prevailing assumption that higher-cooperativity systems are inherently better for photonic applications.