Noisy Preprocessing Facilitates a Photonic Realization of Device-Independent Quantum Key Distribution
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 implement...
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Veröffentlicht in: | Physical review letters 2020-06, Vol.124 (23), p.1-230502, Article 230502 |
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Sprache: | eng |
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Zusammenfassung: | 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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ISSN: | 0031-9007 1079-7114 |
DOI: | 10.1103/PhysRevLett.124.230502 |