Polarization rotation and near-Earth quantum communications

• URL: http://arxiv.org/abs/2106.13426v2
• Date: Thu, 28 Oct 2021 22:02:54 GMT
• Title: Polarization rotation and near-Earth quantum communications
• Authors: Pravin Kumar Dahal and Daniel R. Terno
• Abstract summary: We revisit polarization rotation due to gravity, known as the gravitational Faraday effect. We look at its role in quantum communications with Earth-orbiting satellites.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: We revisit polarization rotation due to gravity, known as the gravitational Faraday effect, with a view on its role in quantum communications with Earth-orbiting satellites. In a static spherically symmetric gravitational field Faraday rotation is purely a reference frame (gauge) effect. This is so also in the leading post-Newtonian expansion of the Earth's gravitational field. However, establishing the local reference frame with respect to distant stars leads to the nonzero Faraday phase. In communications between a ground station and an Earth-orbiting spacecraft this phase is of the order of 10^-10. Under the same conditions the Wigner phase of special relativity is typically of the order 10^-4--10^-5. These phases lead to the physical lower bound on communication errors. However, both types of errors can be simultaneously mitigated. Moreover, they are countered by a fully reference frame independent scheme that also handles arbitrary misalignment between the reference frames of sender and receiver.

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