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criquant
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- My team is searching for a way to achieve the above. Any help appreciated.
Hi, my team and I are working to design an experiment. We are using spontaneous parametric downconversion with a fiber-optic system to create polarization-entangled photons at a rate of roughly 70k pairs/second. We need to be able to insert a delay into one of the two paths while maintaining polarization entanglement - ideally at least 140ms. We've explored a number of techniques for doing so but thus far have not identified any really strong candidates. Fiber-optic recirculating loops would be the ideal approach, but there doesn't seem to be a way to avoid extreme polarization degradation (given the long distance required to attain the required timespan) while also maintaining entanglement. Our strong preference of course is to use a technique that has been experimentally proven rather than figure out how to do something new, and of course the lower the technical complexity the better, as we do intend to actually execute this experiment. Any insight or guidance is greatly appreciated.