Overcoming Noise in Entanglement Distribution

Noise can be considered the natural enemy of quantum information. An often implied benefit of high-dimensional entanglement is its increased resilience to noise. However, manifesting this potential in an experimentally meaningful fashion is challenging and has never been done before. In infinite dim...

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Bibliographic Details
Published in:Physical review. X 2019-11, Vol.9 (4), p.041042, Article 041042
Main Authors: Ecker, Sebastian, Bouchard, Frédéric, Bulla, Lukas, Brandt, Florian, Kohout, Oskar, Steinlechner, Fabian, Fickler, Robert, Malik, Mehul, Guryanova, Yelena, Ursin, Rupert, Huber, Marcus
Format: Article
Language:English
Subjects:
Angular momentum
Communication
Communications systems
Dilution
Discretization
Entangled states
Momentum
Noise
Photons
Physical properties
Quantum entanglement
Quantum phenomena
Qubits (quantum computing)
Resilience
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Summary:Noise can be considered the natural enemy of quantum information. An often implied benefit of high-dimensional entanglement is its increased resilience to noise. However, manifesting this potential in an experimentally meaningful fashion is challenging and has never been done before. In infinite dimensional spaces, discretization is inevitable and renders the effective dimension of quantum states a tunable parameter. Owing to advances in experimental techniques and theoretical tools, we demonstrate an increased resistance to noise by identifying two pathways to exploit high-dimensional entangled states. Our study is based on two separate experiments utilizing canonical spatiotemporal properties of entangled photon pairs. Following these different pathways to noise resilience, we are able to certify entanglement in the photonic orbital-angular-momentum and energy-time degrees of freedom up to noise conditions corresponding to a noise fraction of 72% and 92%, respectively. Our work paves the way toward practical quantum communication systems that are able to surpass current noise and distance limitations, while not compromising on potential device independence.
ISSN:2160-3308
2160-3308
DOI:10.1103/PhysRevX.9.041042