Deterministic generation of qudit photonic graph states from quantum emitters

TL;DR

This paper introduces deterministic methods for generating complex multi-level photonic entangled states from quantum emitters, expanding capabilities for quantum information processing with qudits.

Contribution

It presents novel protocols for deterministic qudit photonic graph state generation, applicable to various complex states, using controllable multi-level emitters and feedback mechanisms.

Findings

Protocols successfully generate qudit cluster states

Methods extend to maximally entangled and error-correcting states

Resource requirements are comparable to qubit systems

Abstract

We propose and analyze deterministic protocols to generate qudit photonic graph states from quantum emitters. We show that our approach can be applied to generate any qudit graph state, and we exemplify it by constructing protocols to generate one- and two-dimensional qudit cluster states, absolutely maximally entangled states, and logical states of quantum error correcting codes. Some of these protocols make use of time-delayed feedback, while others do not. The only additional resource requirement compared to the qubit case is the ability to control multi-level emitters. These results significantly broaden the range of multi-photon entangled states that can be produced deterministically from quantum emitters.