1Institute for Quantum Optics and Quantum Information – IQOQI Vienna, Austrian Academy of Sciences, Boltzmanngasse 3, 1090 Vienna, Austria
2Atominstitut, Technische Universität Wien, Stadionallee 2, 1020 Vienna, Austria
3present address: Quantum Technology Laboratories GmbH, Clemens-Holzmeister-Straße 6/6, 1100 Vienna, Austria
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Abstract
Quantum technologies have matured to the point that we can test fundamental quantum phenomena under extreme conditions. Specifically, entanglement, a cornerstone of modern quantum information theory, can be robustly produced and verified in various adverse environments. We take these tests further and implement a high-quality Bell experiment during a parabolic flight, transitioning from microgravity to hypergravity of 1.8 g while continuously observing Bell violation, with Bell-CHSH parameters between $S=-2.6202$ and $-2.7323$, an average of $overline{S} = -2.680$, and average standard deviation of $overline{Delta S} = 0.014$. This violation is unaffected both by uniform and non-uniform acceleration. This experiment demonstrates the stability of current quantum communication platforms for space-based applications and adds an important reference point for testing the interplay of non-inertial motion and quantum information.
Featured image: Setup installed in the aircraft.
Popular summary
For a long time, the creation and verification of entanglement was nevertheless considered to be technologically challenging, often relying on fragile and easily disturbed optical setups. At the same time, entanglement has emerged as one of the central ingredients of quantum communication and forms a cornerstone of many nascent quantum technologies. Here, we present an experiment that showcases just how far the technology for entanglement-based quantum technologies has come and how resilient setups can be in the face of adverse conditions: we built and installed a setup for Bell tests into a commercial aircraft and continuously measured strong Bell-inequality violations throughout a sequence of several dozen parabolic flight manoeuvres. We show that even these transitions between different levels of acceleration, ranging from steady flight to strong accelerations nearly twice that of the gravitational pull on the surface of Earth, have no effect on the strength of the entanglement.
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Cited by
[1] Julius Arthur Bittermann, Matthias Fink, Marcus Huber, and Rupert Ursin, “Non-inertial motion dependent entangled Bell-state”, arXiv:2401.05186, (2024).
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