Regensburg 2022 – scientific programme

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QI: Fachverband Quanteninformation

QI 9: Quantum Correlations

QI 9.7: Talk

Thursday, September 8, 2022, 11:15–11:30, H8

Schmidt number witnesses for high-dimensional quantum states in photonic temporal mode setups — •Nikolai Wyderka¹, Giovanni Chesi², Hermann Kampermann¹, and Dagmar Bruß¹ — ¹Institut für Theoretische Physik III, Heinrich-Heine-Universität Düsseldorf, D-40225 Düsseldorf, Germany — ²Istituto Nazionale di Fisica Nucleare Sezione di Pavia, Via Agostino Bassi 6, I-27100 Pavia, Italy

Photonic temporal modes offer a robust and efficient toolbox for high-dimensional quantum information applications. In order to characterize the experimentally generated quantum states, we aim to use witnesses to certify their Schmidt numbers as a robust entanglement measure. To that end, we develop an iterative algorithm that yields Schmidt number witness candidates that require only a few of those measurements inherent to the temporal mode framework using quantum pulse gates. Finally, we use the numerical candidates to derive a proper Schmidt number witness for states close to the maximally entangled state.