科研之友
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摘要
We describe the design of a temporal imaging system that simultaneously reshapes the temporal profile and converts the frequency of a photonic wave packet, while preserving its quantum state. A field lens, which imparts a temporal quadratic phase modulation, is used to correct for the residual phase caused by field curvature in the image, thus enabling temporal imaging for phase-sensitive quantum applications. We show how this system can be used for temporal imaging of time-bin entangled photonic wave packets and compare the field lens correction technique to systems based on a temporal telescope and far-field imaging. The field-lens approach removes the residual phase using four dispersive elements. The group delay dispersion D is constrained by the available bandwidth Delta v by D > t/Delta v, where t is the temporal width of the wave form associated with the dispersion D. This is compared to the much larger dispersion D >> pi t(2)/8 required to satisfy the Fraunhofer condition in the far-field approach. DOI: 10.1103/PhysRevA.87.043808
- 出版日期2013-4-8
