Rotational-invariant quantum key distribution based on a quantum dot source

• URL: http://arxiv.org/abs/2506.23172v1
• Date: Sun, 29 Jun 2025 10:13:38 GMT
• Title: Rotational-invariant quantum key distribution based on a quantum dot source
• Authors: Paolo Barigelli, Francesco Sirovich, Gonzalo Carvacho, Fabio Sciarrino,
• Abstract summary: Single-photon quantum emitters offer remarkable on-demand photon emission, near-unitary indistinguishability, and low multiphoton generation.<n>Our findings suggest a viable direction for the use of rotational-invariant hybrid states in on-demand QKD protocols.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: 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.

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