Teleportation-based filtering for gravitational-wave detectors

Yohei Nishino

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arXiv · 2509.20812

Teleportation-based filtering for gravitational-wave detectors

Yohei Nishino

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Abstract

Employing the principle of quantum teleportation in gravitational-wave detectors provides a method to address technical challenges associated with implementing quantum filters for squeezed-light injection. A recent proposal has shown that an arbitrary number of effective squeezing-angle rotations can be achieved by cascading quantum teleportation, yielding sensitivity equivalent to frequency-dependent pre-filtering. A natural question is whether the teleportation-based protocol can also realize frequency-dependent post-filtering. In this work, we examine this possibility and show that, with perfect teleportation fidelity, post-filtering can be fully implemented. In practice, however, various imperfections make the sensitivity nearly equivalent to that of teleportation-based pre-filtering. We apply this scheme to the low-frequency detector in the Einstein Telescope xylophone configuration and find that teleportation-based post-filtering could also be a candidate for the detector's design.

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Yohei Nishino. 2025-09-25. Teleportation-based filtering for gravitational-wave detectors. https://arxiv.org/abs/2509.20812

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