Abstract
Device-independent quantum key distribution (DI-QKD) represents one of the most fascinating challenges in quantum communication, exploiting concepts of fundamental physics, namely Bell tests of nonlocality, to ensure the security of a communication link. This requires the loophole-free violation of a Bell inequality, which is intrinsically difficult due to losses in fibre optic transmission channels. Heralded photon amplification (HPA) is a teleportation-based protocol that has been proposed as a means to overcome transmission loss for DI-QKD. Here we demonstrate HPA for path entangled states and characterise the entanglement before and after loss by exploiting a recently developed displacement-based detection scheme. We demonstrate that by exploiting HPA we are able to reliably maintain high fidelity entangled states over loss-equivalent distances of more than 50 km.
Original language | English |
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Article number | 024008 |
Pages (from-to) | 1-7 |
Number of pages | 7 |
Journal | Quantum Science and Technology |
Volume | 2 |
Issue number | 2 |
DOIs | |
Publication status | Published - 1 Jun 2017 |
Keywords
- device-independentQKD
- heralded photon amplifier
- path entanglement
- quantum communication