Noisy pre-processing facilitating a photonic realisation of device-independent quantum key distribution

• URL: http://arxiv.org/abs/2005.13015v1
• Date: Tue, 26 May 2020 20:22:43 GMT
• Title: Noisy pre-processing facilitating a photonic realisation of device-independent quantum key distribution
• Authors: M. Ho, P. Sekatski, E.Y.-Z. Tan, R. Renner, J.-D. Bancal and N. Sangouard
• Abstract summary: Device-independent quantum key distribution provides security even when the equipment used to communicate over the quantum channel is largely uncharacterized. A central obstacle in photonic implementations is that the global detection efficiency must be above a certain threshold. We here propose a method to significantly relax this threshold, while maintaining provable device-independent security.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Device-independent quantum key distribution provides security even when the equipment used to communicate over the quantum channel is largely uncharacterized. An experimental demonstration of device-independent quantum key distribution is however challenging. A central obstacle in photonic implementations is that the global detection efficiency, i.e., the probability that the signals sent over the quantum channel are successfully received, must be above a certain threshold. We here propose a method to significantly relax this threshold, while maintaining provable device-independent security. This is achieved with a protocol that adds artificial noise, which cannot be known or controlled by an adversary, to the initial measurement data (the raw key). Focusing on a realistic photonic setup using a source based on spontaneous parametric down conversion, we give explicit bounds on the minimal required global detection efficiency.

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