2025/06/29 by Paolo Barigelli, Barigelli, Paolo, francesco sirovich +5
Computer Science · Physics and Astronomy · #FOS: Physical sciences #Mechanical and Optical Resonators #Orbital Angular Momentum in Optics #Quantum Information and Cryptography #Quantum Physics (quant-ph)
paper · pdf · doi:10.48550/arxiv.2506.23172
openalex publication_date 2025/06/29 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
Quantum Key Distribution (QKD) is a cutting-edge field that leverages the principles of quantum mechanics to enable secure communication between parties involved. Single-photon quantum emitters offer remarkable on-demand photon emission, near-unitary indistinguishability, and low multiphoton generation, thereby enhancing the performance of QKD protocols. Standard approaches in which the polarization degree-of-freedom is exploited are limited by the precise alignment between the communicating parties. To overcome this obstacle, the Orbital Angular Momentum (OAM) of light represents a suitable candidate for encoding the information, as it allows the implementation of rotational-invariant photonic states that remove the need for a fixed physical reference frame between the communicating parties. Here, we report the implementation of an on-demand, rotational-invariant BB84-QKD protocol achieved by exploiting a bright quantum dot source, active time-to-spatial demultiplexing, and Q-plate devices with a space-variant pattern to encode hybrid photonic states. Our findings suggest a viable direction for the use of rotational-invariant hybrid states in on-demand QKD protocols, potentially enhancing security and robustness in complex operational scenarios.