| Linear Optics and Projective Measurements for Fun and Profit (2008) | |||||||||||||
Abstract | |||||||||||||
| 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 im-proved 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. Keywords: Linear optical quantum computation, path-entangled state of light, Heisenberg-limited interferometry, single-photon QND measurement, quantum repeater 1. | |||||||||||||
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