Quantum 2025 – scientific programme
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THU: Thursday Contributed Sessions
THU 13: Poster Session: Applications
THU 13.36: Poster
Thursday, September 11, 2025, 16:30–18:30, ZHG Foyer 1. OG
Deterministic Generation of Linear Photonic Cluster States with Semiconductor Quantum Dots: A Detailed Comparison of Different Schemes — •Nikolas Köcher1, David Bauch1, Nils Heinisch1, and Stefan Schumacher1, 2 — 1Department of Physics, Center for Optoelectronics and Photonics Paderborn (CeOPP) and Institute for Photonic Quantum Systems (PhoQS), Paderborn University, D-33098 Paderborn, Germany — 2Wyant College of Optical Sciences, University of Arizona, Tucson, AZ 85721, USA
Graph and cluster states are types of multipartite entangled states with applications in quantum communication and measurement-based quantum computation. We theoretically investigate and compare different schemes for the deterministic generation of linear photonic cluster states using spins in charged semiconductor quantum dots with strong Purcell enhancement. The schemes differ in the method used for spin control and whether the emitted photonic qubits are polarization or time-bin encoded. We efficiently track the fidelity and the useable length of the cluster states by calculating the expectation values of their stabilizer generators based on photonic multi-time correlation functions G(n)(t1,t2,...), assessing their actual state fidelity beyond the calculation of gate fidelities [1]. We find that the performance of the schemes and which scheme is optimal strongly depend on the cavity environment and the coherence time of the spin qubit.
[1] D. Bauch, N. Köcher, N. Heinisch, S. Schumacher, APL Quantum 1, 036110 (2024).
Keywords: quantum dots; graph states; cluster states; photon entanglement; spin-photon entanglement