Author: ["Ruifang Dong","Mikael Lassen","Joel Heersink","Christoph Marquardt","Radim Filip","Gerd Leuchs","Ulrik L. Andersen"]
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Abstract
Two independent experiments demonstrate that quantum entanglement that has been lost in decoherence processes can be recovered. For the first time such ‘entanglement distillation’ has been achieved for states of light that are entangled in continuous variables, which should help to increase the distance over which quantum information can be distributed. The distribution of entangled states between distant parties in an optical network is crucial for the successful implementation of various quantum communication protocols such as quantum cryptography, teleportation and dense coding1,2,3. However, owing to the unavoidable loss in any real optical channel, the distribution of loss-intolerant entangled states is inevitably afflicted by decoherence, which causes a degradation of the transmitted entanglement. To combat the decoherence, entanglement distillation, a process of extracting a small set of highly entangled states from a large set of less entangled states, can be used4,5,6,7,8,9,10,11,12,13,14. Here we report on the distillation of deterministically prepared light pulses entangled in continuous variables that have undergone non-Gaussian noise. The entangled light pulses15,16,17 are sent through a lossy channel, where the transmission is varying in time similarly to light propagation in the atmosphere. By using linear optical components and global classical communication, the entanglement is probabilistically increased.Cite this article
Dong, R., Lassen, M., Heersink, J. et al. Experimental entanglement distillation of mesoscopic quantum states. Nature Phys 4, 919–923 (2008). https://doi.org/10.1038/nphys1112 