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Researchers at Universität Hamburg have identified "hyperloss," where even minor spatial misalignments (as low as 1%) in quantum networks can degrade squeezed states into thermal noise, effectively eliminating quantum advantages by exceeding standard loss thresholds. This discovery challenges existing assumptions about signal degradation and offers a viable recovery method through tuning differential spatial-mode phases to convert this limitation into a manageable design parameter for future systems.

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Mode Mismatch Causes “Hyperloss” of Up to 30% in Quantum Networks

Quantum ZeitgeistJuly 26, 20265 min read

Squeezed states in quantum-correlated networks, vital for quantum computing & communications, can suffer “hyperloss”—exceeding 30%—due to spatial mode mismatches.

A seemingly small misalignment of light beams in quantum networks can trigger a disproportionate loss of quantum information, with researchers now demonstrating up to 30% relative to the initial squeezing, a phenomenon they term “hyperloss.” Stephan Grebien, Julian Gurs, Roman Schnabel, and Mikhail Korobko of Universität Hamburg report that even 1% mode mismatch within a two-node quantum network was enough to convert a squeezed state into an effectively thermal state with no quadrature squeezing, effectively eliminating any quantum advantage. This finding challenges the standard assumption that such mismatches cause only minor, incoherent loss. The team’s work reveals that hyperloss arises from quantum-correlated mixing…

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