Deterministic and reconfigurable graph state generation with a single solid-state quantum emitter

Abstract

Measurement-based quantum computing offers a promising route towards scalable, universal photonic quantum computation. This approach relies on the deterministic and efficient generation of photonic graph states in which many photons are mutually entangled with various topologies. Recently, deterministic sources of graph states have been demonstrated with quantum emitters in both the optical and microwave domains. In this work, we demonstrate deterministic and reconfigurable graph state generation with optical solid-state integrated quantum emitters. Specifically, we use a single semiconductor quantum dot in a cavity to generate caterpillar graph states, the most general type of graph state that can be produced with a single emitter. By using fast detuned optical pulses, we achieve full control over the spin state, enabling us to vary the entanglement topology at will. We perform quantum state tomography of two successive photons, measuring Bell state fidelities up to 0.80$\pm$0.04 and concurrences up to 0.69$\pm$0.09, while maintaining high photon indistinguishability. This simple optical scheme, compatible with commercially available quantum dot-based single photon sources, brings us a step closer to fault-tolerant quantum computing with spins and photons.

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• Annual-modulation fingerprint of the axion wind induced sideband triplet in quantum dot spin qubit sensors
• Many-Body Entanglement in Solid-State Emitters
• The impact of hole $g$-factor anisotropy on spin-photon entanglement generation with InGaAs quantum dots
• Monitoring the generation of photonic linear cluster states with partial measurements
• Comparing Schemes for Creating Qudit Graph States from 16- & 128-dimensional Hilbert Space using Donors in Silicon
• A dataflow programming framework for linear optical distributed quantum computing
• Optical Quantum Computing
• Hierarchical Generation and Design of Tree-Codes for Resource-Efficient Loss-Tolerant Quantum Communications
• Semi-Deterministic Quantum Dot Placement in Heteroepitaxy