Freiburg 2024 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 12: Quantum Communication II
Q 12.2: Talk
Monday, March 11, 2024, 17:15–17:30, HS 3118
Robust Preparation of Ensemble-based Quantum Tokens with Trapped Ions — •Manika Bhardwaj, Jan Thieme, Bernd Bauerhenne, Moritz Göb, Bo Deng, and Kilian Singer — Institut für Physik, Universität Kassel, Heinrich-Plett-Straße 40, 34132 Kassel, Germany
Quantum tokens are an important building block for securing identification devices. Previous implementations were based on the quantum no-cloning theorem. Here we present a novel quantum token protocol [1] and its implementation with an ensemble of trapped ions. Due to long coherence times and single-shot readout, trapped ions are well-suited for implementing a robust quantum token protocol. We aim to implement the quantum token protocol on the 42S1/2−32D5/2 transition of 40Ca+ ions. Uniform preparation of the entire ensemble of trapped ions is crucial for the protocol because errors directly influence the security of the quantum token protocol. We will present adapted composite pulses [2, 3] that address different resonance frequencies and are robust against intensity-based pulse area errors of the individual ions. [1] K. Singer, C. Popov, and B. Naydenov, Verfahren zum Erstellen eines Quanten-Datentokens (DE 10 2022 107 528 A1) DE-Patent (2023). [2] B. T. Torosov, S. S. Ivanov, and N. V. Vitanov, Narrowband and passband composite pulses for variable rotations, Phys. Rev. A 102, 013105 (2020). [3] G. T. Genov, M. Hain, N. V. Vitanov, and T. Halfmann, Universal composite pulses for efficient population inversion with an arbitrary excitation profile, Phys. Rev. A 101, 013827 (2020).
Keywords: Trapped ions; Quantum token; Quantum information; Composite pulses; Quantum control