Coherent enhancement in detectors is quantitatively constrained by single-mode entanglement entropy, with general bounds on scaling with system size that interpolate between incoherent and fully coherent regimes.
X a (Ga k)† Ga ℓ (ρkℓ −ρ k ⊗ρ ℓ) # .(B20) For the incoherent first term, note that X a Var(Gk)≤ X a Tr h ρk (Ga k)† Ga k i (B21) = Tr
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Entanglement Requirements for Coherent Enhancement in Detectors
Coherent enhancement in detectors is quantitatively constrained by single-mode entanglement entropy, with general bounds on scaling with system size that interpolate between incoherent and fully coherent regimes.