Quantum key distribution overcoming extreme noise: simultaneous subspace coding using high-dimensional entanglement

• URL: http://arxiv.org/abs/2004.12824v2
• Date: Wed, 10 Mar 2021 09:26:07 GMT
• Title: Quantum key distribution overcoming extreme noise: simultaneous subspace coding using high-dimensional entanglement
• Authors: Mirdit Doda, Marcus Huber, Gl\'aucia Murta, Matej Pivoluska, Martin Plesch, Chrysoula Vlachou
• Abstract summary: We show that it is possible to exploit noisy high-dimensional entanglement for quantum key distribution. Our protocol can be used to establish a secret key even in extremely noisy experimental conditions.
• Score: 0.12233362977312945
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: High-dimensional entanglement promises to increase the information capacity of photons and is now routinely generated exploiting spatio-temporal degrees of freedom of single photons. A curious feature of these systems is the possibility to certify entanglement despite strong noise in the data. We show that it is also possible to exploit this noisy high-dimensional entanglement for quantum key distribution by introducing a protocol that uses mutliple subspaces of the high-dimensional system simultaneously. Our protocol can be used to establish a secret key even in extremely noisy experimental conditions, where qubit protocols fail. To show that, we analyze the performance of our protocol for noise models that apply to the two most commonly used sources of high-dimensional entanglement: time bins and spatial modes.

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