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This study examines quantum-enhanced techniques for estimating satellite positions in inter-satellite quantum communication systems. The researchers investigated using squeezed light in the derivative mode of a Gaussian probe beam to measure photon-beam displacement, comparing its performance against classical methods under equal energy constraints. They found that while diffraction and beam spreading reduce the quantum advantage at longer distances, squeezed light still provides measurable benefits for satellite separations up to approximately 100 km, which is relevant for satellite constellations like Starlink.
Why it matters
The findings suggest quantum techniques could improve position estimation accuracy in emerging satellite communication networks operating at distances typical of low Earth orbit constellations. This has practical applications for quantum-secure time transfer between satellites and the development of next-generation satellite communication infrastructure.
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⚠️ Preprint – Noch nicht peer-reviewed
Dieser Artikel wurde noch nicht von unabhängigen Experten begutachtet. Die Ergebnisse sind vorläufig und sollten mit Vorsicht interpretiert werden.
Abstract: In this work, we investigate the practical feasibility of achieving a quantum advantage, in the context of inter-satellite quantum communication, of satellite position estimation. The investigation focuses on a quantum-enhanced scheme in which squeezing is added to the derivative mode of a Gaussian probe beam as a means of estimating photon-beam displacement. The performance of the scheme is compared against the standard quantum limit achieved by an optimal classical beam-displacement estimation scheme under a fair same-total-energy constraint. We find that although the benefit provided by squeezing rapidly diminishes as the inter-satellite distance increases due to diffraction-induced beam spreading and subsequent truncation by the finite receiver aperture, a quantum advantage can still be expected over inter-satellite distances up to approximately 100 km under practical satellite configurations. This distance scale between satellites is anticipated for Starlink-type satellite constellations.
Source: Quantum Advantage in Beam-Displacement Estimation for Inter-Satellite Quantum-Secure Time Transfer