Non-local temporal interferometry for highly resilient free-space
quantum communication
- URL: http://arxiv.org/abs/2204.07536v1
- Date: Fri, 15 Apr 2022 16:29:37 GMT
- Title: Non-local temporal interferometry for highly resilient free-space
quantum communication
- Authors: Lukas Bulla, Matej Pivoluska, Kristian Hjorth, Oskar Kohout, Jan Lang,
Sebastian Ecker, Sebastian Philipp Neumann, Julius Bittermann, Robert
Kindler, Marcus Huber, Martin Bohmann and Rupert Ursin
- Abstract summary: We present an interstate free-space quantum link, distributing hyper-entanglement over $10.2,$km with flexible dimensionality of encoding.
We analyse the achievable key rate in a dimensionally-dimensional QKD protocol that can be optimized with respect to any environmental noise conditions.
- Score: 0.0
- License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
- Abstract: Entanglement distribution via photons over long distances enables many
applications, including quantum key distribution (QKD), which provides
unprecedented privacy. The inevitable degradation of entanglement through noise
accumulated over long distances remains one of the key challenges in this area.
Exploiting the potential of higher-dimensional entangled photons promises to
address this challenge, but poses extreme demands on the experimental
implementation. Here, we present an interstate free-space quantum link,
distributing hyper-entanglement over $10.2\,$km with flexible dimensionality of
encoding by deploying a phase-stable non-local Franson interferometer. With
this distribution of multidimensional energy-time entangled photons, we analyse
the achievable key rate in a dimensionally-adaptive QKD protocol that can be
optimized with respect to any environmental noise conditions. Our approach
enables and emphasises the power of high-dimensional entanglement for quantum
communication, yielding a positive asymptotic key rate well into the dawn of
the day.
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