Regensburg 2025 – scientific programme

Parts | Days | Selection | Search | Updates | Downloads | Help

HL: Fachverband Halbleiterphysik

HL 57: Quantum Dots and Wires: Optics II

HL 57.1: Talk

Friday, March 21, 2025, 09:30–09:45, H13

Deterministic Generation of Linear Photonic Cluster States with Semiconductor Quantum Dots: A Detailed Comparison of Different Schemes — •Nikolas Köcher, David Bauch, Nils Heinisch, and Stefan Schumacher — Physics Department, CeOPP, and PhoQS, Paderborn University, Germany

Graph and cluster states are types of multipartite entangled states with applications in quantum communication [1] and measurement-based quantum computation [2]. We theoretically investigate and compare different schemes for the deterministic generation of linear photonic cluster states using spins and trions in charged semiconductor quantum dots under 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 usable length of the cluster states by calculating the expectation values of their stabilizer generators, assessing their fidelity beyond the calculation of gate fidelities [3]. We find that the performance of the different schemes and which scheme is optimal strongly depend on the cavity environment and the coherence time of the spin qubit.

[1] K. Azuma, K. Tamaki, H.-K. Lo, Nat. Commun. 6, 6785 (2015).

[2] R. Raussendorf, H. Briegel, Phys. Rev. Lett. 86, 5188 (2001).

[3] D. Bauch, N. Köcher, N. Heinisch, S. Schumacher, APL Quantum 1, 036110 (2024).

Keywords: Quantum dots; Quantum emitters; Photonic graph states; Photonic cluster states; Photon entanglement