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| Main Authors: | , , , |
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| Format: | Preprint |
| Published: |
2025
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2506.23172 |
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| _version_ | 1866911028037550080 |
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| author | Barigelli, Paolo Sirovich, Francesco Carvacho, Gonzalo Sciarrino, Fabio |
| author_facet | Barigelli, Paolo Sirovich, Francesco Carvacho, Gonzalo Sciarrino, Fabio |
| contents | 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2506_23172 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Rotational-invariant quantum key distribution based on a quantum dot source Barigelli, Paolo Sirovich, Francesco Carvacho, Gonzalo Sciarrino, Fabio Quantum Physics 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. |
| title | Rotational-invariant quantum key distribution based on a quantum dot source |
| topic | Quantum Physics |
| url | https://arxiv.org/abs/2506.23172 |