Linear optics and projective measurements for fun and profit
The technique of projective measurements in linear optics can provide apparent, efficient nonlinear interaction between photons, which is technically problematic otherwise. We present an application of such a technique to prepare large photon-number path entanglement. Large photon-number path entanglement is an important resource for Heisenberg-limited optical interferometry, where the sensitivity of phase measurements can be improved beyond the usual shot-noise limit. A similar technique can also be applied to signal the presence of a single photon without destroying it. We further show how to build a quantum repeater for long-distance quantum communication.
Publication Source (Journal or Book title)
Proceedings of SPIE - The International Society for Optical Engineering
Kok, P., Lee, H., Williams, C., & Dowling, J. (2003). Linear optics and projective measurements for fun and profit. Proceedings of SPIE - The International Society for Optical Engineering, 5115, 298-307. https://doi.org/10.1117/12.502402