Journal Article10.1126/SCIENCE.1158275
Entangled Images from Four-Wave Mixing
TL;DR: A spatially multimode amplifier based on four-wave mixing in a hot vapor is used to produce twin images that exhibit localized entanglement, demonstrating that the system is an ideal source for parallel continuous-variable quantum information protocols.
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Abstract: Two beams of light can be quantum mechanically entangled through correlations of their phase and intensity fluctuations. For a pair of spatially extended image-carrying light fields, the concept of entanglement can be applied not only to the entire images but also to their smaller details. We used a spatially multimode amplifier based on four-wave mixing in a hot vapor to produce twin images that exhibit localized entanglement. The images can be bright fields that display position-dependent quantum noise reduction in their intensity difference or vacuum twin beams that are strongly entangled when projected onto a large range of different spatial modes. The high degree of spatial entanglement demonstrates that the system is an ideal source for parallel continuous-variable quantum information protocols.
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Citations
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TL;DR: In this paper , a simple method that infers optical phase shifts through standard intensity measurements while still maintaining the quantum advantage in the measurement precision is proposed. But the method is limited to the audio band.
Relative intensity squeezing by four-wave mixing with loss: an analytic model and experimental diagnostic.
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