Polarization effects in aerial fibers

Waddy, David S.; Chen, Liang; Bao, Xiaoyi

doi:10.1016/j.yofte.2004.07.002

Cited by 22 publications

(8 citation statements)

References 31 publications

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“…When compared to Refs. [28,29], our results show that this submarine environment is very favourable for polarisation-based quantum communication in optical fibres, demonstrating even greater stabil-ity than in laboratories with conventional climate control, which often only regulates the temperature with the accuracy of 1 or 2 kelvin.…”

Section: Resultsmentioning

confidence: 76%

Passively stable distribution of polarisation entanglement over 192 km of deployed optical fibre

et al. 2020

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Quantum key distribution (QKD) based on entangled photon pairs holds the potential for repeater-based quantum networks connecting clients over long distance. We demonstrate longdistance entanglement distribution by means of polarisation-entangled photon pairs through two successive deployed 96 km-long telecommunications fibres in the same submarine cable. One photon of each pair was detected directly after the source, while the other travelled the fibre cable in both directions for a total distance of 192 km and attenuation of 48 dB. The observed two-photon Bell state exhibited a fidelity 85%±2 % and was stable over several hours. We employed neither active stabilisation of the quantum state nor chromatic dispersion compensation for the fibre.

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Section: Resultsmentioning

confidence: 76%

Passively stable distribution of polarisation entanglement over 192 km of deployed optical fibre

et al. 2020

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“…32. The stability depends on the external conditions, since sometimes, buried or aerial fibers are found to exhibit faster polarization changes (23, 44, 45), which call for a control technique that continuously optimizes the QBER.…”

Section: Discussionmentioning

confidence: 99%

“…This is because polarization-entangled qubits are easy to measure and prepare with a high fidelity, and they can be transmitted without notable depolarization over distances of at least ∼100 km as indicated by our experimental results. Nevertheless, studies mentioned above (23, 43, 44, 45) have shown that the deployed fibers have to be selected with care, as the stability of their polarization state depends on external influences. Polarization entanglement can also be used to seamlessly interface between free space- and fiber-based communication links.…”

Section: Discussionmentioning

confidence: 99%

Entanglement distribution over a 96-km-long submarine optical fiber

Wengerowsky

Joshi

Steinlechner

et al. 2019

Proc. Natl. Acad. Sci. U.S.A.

139

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Quantum entanglement is one of the most extraordinary effects in quantum physics, with many applications in the emerging field of quantum information science. In particular, it provides the foundation for quantum key distribution (QKD), which promises a conceptual leap in information security. Entanglement-based QKD holds great promise for future applications owing to the possibility of device-independent security and the potential of establishing global-scale quantum repeater networks. While other approaches to QKD have already reached the level of maturity required for operation in absence of typical laboratory infrastructure, comparable field demonstrations of entanglement-based QKD have not been performed so far. Here, we report on the successful distribution of polarization-entangled photon pairs between Malta and Sicily over 96 km of submarine optical telecommunications fiber. We observe around 257 photon pairs per second, with a polarization visibility above 90%. Our results show that QKD based on polarization entanglement is now indeed viable in long-distance fiber links. This field demonstration marks the longest-distance distribution of entanglement in a deployed telecommunications network and demonstrates an international submarine quantum communication channel. This opens up myriad possibilities for future experiments and technological applications using existing infrastructure.

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“…2 indicates the bias feedback loop would need to be at the least 4 times as fast as would be needed for the 10 and 21 km fiber. A more rigorous study of the length vs. rate of drift would be needed to work out the feasibility for building a proper feedback circuit and need to include real world analysis of SOP drift, some of which has been covered in [4]. Additionally, polarization dependent loss (PDL), which is the measure of the peak-to-peak difference in transmission of an optical system with respect to all possible states of polarization, is of concern for PolM links [5].…”

Section: Polariza Tion Modulator Links For Intensity Modulationmentioning

confidence: 99%