Eliminating frequency and space-time correlations in multiphoton states

By W. Grice, A. U’Ren, Ian A. Walmsley. 2001

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Chip-to-chip quantum teleportation and multi-photon entanglement in silicon (2019, background): “These photon-pairs however are highly correlated in frequency [25], and improving their spectral purity requires narrowband spectral filtering — causing a significant reduction of photon counts and heralding efficiency.”
Nonlinear optical signals and spectroscopy with quantum light (2016, methodology): “To this end, we approximate the phase-matching function by a Gaussian, sinc ( ∆k(ωa, ωb)L 2 ) ≈ exp [ −γ (∆k(ωa, ωb)L)2 ] , (B1) where the factor γ = 0.04822 is chosen, such that the Gaussian reproduces the central peak of the sinc-function.”
Linear optical quantum computing with photonic qubits (2005, background): “A detailed study of the mode structure of the conditional photon pulse has been undertaken by Grice et al. (2001).”
Continuous-variable optical quantum-state tomography (2009, background): “The first detailed theoretical inquiry into preparation of uncorrelated down-conversion spectra was made by Grice et al. 2001 , based on general theoretical analysis of Keller and Rubin 1997 .”
Photonic quantum information processing: A concise review (2019, background): “This technique provides photon pairs that are inherently uncorrelated in their spectrum, 113,114 and reduces or removes the need for spectral ﬁltering.”