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.
Spin-Dependent Force and Inverted Harmonic Potential for Rapid Creation of Macroscopic Quantum Superpositions
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Acceleration noise induces only dephasing in SGIs via linear response while common-mode cancellation prevents contrast loss and position localisation; higher-order noise induces both with decay set by noise PSD at intrinsic frequency.
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Witnessing entanglement between photon and matter due to graviton exchange
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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Acceleration Noise Induced Decoherence in Stern-Gerlach Interferometers for Gravity Experiments
Acceleration noise induces only dephasing in SGIs via linear response while common-mode cancellation prevents contrast loss and position localisation; higher-order noise induces both with decay set by noise PSD at intrinsic frequency.