SAMOP 2023 – wissenschaftliches Programm
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QI: Fachverband Quanteninformation
QI 9: Photonic Quantum Technologies (joint session Q/QI)
QI 9.5: Vortrag
Dienstag, 7. März 2023, 12:00–12:15, A320
Raman control for ultrahigh fidelity spin gates for the generation of large entangled photonic states with group-IV vacancies — •Gregor Pieplow1, Joseph H. D. Munns2, Mariano I. Monsalve1, and Tim Schröder1,3 — 1Department of Physics, Humboldt-Universität zu Berlin, 12489 Berlin, Germany — 2Psi Quantum, 94304 California Palo Alto, USA — 3Ferdinand-Braun-Institut, 12489 Berlin, Germany
Large photonic entangled states such as multiphoton Greenberger-Horne-Zeilinger (GHZ) states or cluster states (CS) play a crucial role as a resource in two key photonic quantum information applications: measurement-based quantum computing, and one-way quantum repeaters. Here, we focus on theoretically investigating the deterministic generation of photonic resource states by employing a promising class of optically active spin defects in diamond: group-IV color centers. Specifically, we investigate the generation of linear cluster states and GHZ states. Because the generation of a large entangled photonic state comprised of single photons requires many iterations of the same coherent operations on a quantum emitter, they have to be of ultra high fidelity or otherwise the quality of the state degrades exponentially. This work provides a highly detailed investigation of the optical coherent control that facilitates single and two qubit gates, which are used for the deterministic generation of highly entangled states. We also introduce an original GHZ and CS quality measure, which will underline the importance of ultrafast and high fidelity control techniques for creating large time-bin entangled photonic qubit states.