SAMOP 2023 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 34: Quantum Communication (joint session QI/Q)

Q 34.2: Talk

Wednesday, March 8, 2023, 15:00–15:15, B305

Security of Time-Frequency Quantum Key Distribution — •Federico Grasselli, Nikolai Wyderka, Hermann Kampermann, and Dagmar Bruss — Heinrich-Heine-Universität Düsseldorf

One of the current drawbacks of Quantum key distribution (QKD) are the relatively low generation rates of secret keys, hindered by effects such as noise in the quantum channel and detector saturation. Such issues can be alleviated by increasing the dimension of the encoding space with time-frequency QKD, where log2(d) bits of information are encoded in 'd' time bins of a single photon, thereby increasing the efficiency of the communication.

We focus on a specific experimental implementation of time-frequency QKD that can be easily scaled to higher dimensions. For this setup, we discuss a method to prove its security by closing a critical loophole that has been often overlooked in QKD implementations based on the photons' temporal degree of freedom. Moreover, we provide preliminary experimental data demonstrating that our security method can be applied to practical time-frequency QKD setups.