Freiburg 2024 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 43: Color Centers III
Q 43.2: Talk
Thursday, March 14, 2024, 11:15–11:30, Aula
Photonic multipartite entangled state generation with group-IV color centers — •Gregor Pieplow1, Yannick Strocka1, Mariano I. Monsalve2, Joseph H. D. Munns3, and Tim Schröder1 — 1Humboldt-Universität zu Berlin, 12489 Berlin, Germany — 2University of Innsbruck, 6020 Innsbruck, Austria — 3PsiQuantum, 94304 California Palo Alto, USA
In this work, we analyze the generation of large entangled photonic states, specifically multiphoton Greenberger-Horne-Zeilinger (GHZ) states and cluster states (CS) using group-IV color centers. These states are an essential resource in photonic quantum information applications, for example in measurement-based quantum computing and one-way quantum repeaters. Our research aims at providing a comprehensive analysis of the coherent control operations that are required for the creation of these resource states. The fidelity of these operations is critical; any compromise leads to a rapid degradation in the quality of the state. In particular, our work focuses on an optical Raman control scheme and microwave control. Both types of control operations enable single and two-qubit gates, which are crucial for the deterministic generation of resource states. Additionally, the study introduces a novel quality measure, which highlights the significance of fast, high-fidelity control techniques.
Keywords: Color Center; Group Four Vacancy; Cluster State; Coherent Control; Diamond