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Heralded amplification of path entangled quantum states

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Published in Quantum Science and Technology. 2017, vol. 2, no. 2, 024008
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.
Keywords quantum amplifier
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Research groups Groupe Zbinden
Groupe Gisin
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FNS: 200021_159592
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DO REGO MONTEIRO, Fernando Henrique et al. Heralded amplification of path entangled quantum states. In: Quantum Science and Technology, 2017, vol. 2, n° 2, p. 024008. doi: 10.1088/2058-9565/aa70ad https://archive-ouverte.unige.ch/unige:94656

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Deposited on : 2017-06-06

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