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These operators satisfy theSU(2)commutation relations[ ˆSi, ˆSj] = 2iϵijk ˆSk, where i, j, k∈ {1

To measure the component corresponding to ˆS3, we set θLO =π/2, which transforms the interference term: ˆS1(π/2) =i( ˆb†ˆa−ˆa†ˆb) = ˆS3(0)

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quant-ph 1

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2026 1

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Witnessing entanglement between photon and matter due to graviton exchange

quant-ph · 2026-04-27 · unverdicted · novelty 6.0

A PPT witness criterion is proposed to detect graviton-mediated entanglement between photons and matter qubits, attaining a maximal negativity of -0.052 for non-maximally entangled states when the photon coherent-state overlap satisfies 0.71 ≤ |γ| < 1.

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  • Witnessing entanglement between photon and matter due to graviton exchange quant-ph · 2026-04-27 · unverdicted · none · ref 2

    A PPT witness criterion is proposed to detect graviton-mediated entanglement between photons and matter qubits, attaining a maximal negativity of -0.052 for non-maximally entangled states when the photon coherent-state overlap satisfies 0.71 ≤ |γ| < 1.