Abstract
Spectral correlation of photon pairs generated in dispersion shifted fiber by a pulsed pump is theoretically analyzed and experimentally investigated. We first calculate the spectral function of photon pairs according to the deduced two-photon state generated by spontaneous four wave mixing under the assumptions close to the real experimental conditions. We then experimentally study the spectral property of the signal and idler photon pairs generated in optical fiber by photon correlation measurements, and the experimental results agree with the calculation. The investigation is useful for developing fiber-based sources of entangled photon pairs and for studying multi-photon quantum interference with multiple photon pairs.
Highlights
Quantum correlated photon pairs have been a critical resources for quantum information processing (QIP)
We have characterized spectral properties of non-degenerate photon pairs in optical fiber generated by a picoseconds pump pulse from both the theoretical and experimental aspects
The theoretical calculations show that it is possible to properly manage the experimental parameters so that the phase matching function of four-wave mixing (FWM) does not play a role in its corresponding joint spectral function
Summary
Quantum correlated photon pairs have been a critical resources for quantum information processing (QIP). The incoherence in the down-converted fields makes the high visibility in interference between independent fields impossible without using optical filters to clean the modes, which will reduce the count rate significantly. This problem can be solved to some extent by properly tailoring the dispersive properties of the χ(2) crystals [11]. Apart from the experimental progresses [12, 13, 21, 14, 15, 16, 17], theoretical models analyzing the fiber based two-photon state for the pulsed pump in the normal and anomalous dispersion regions, respectively, had been successively investigated [22, 23]. The investigation is useful for developing fiberbased sources of entangled photon pairs and for studying multi-photon quantum interference with multiple photon pairs
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