Highly entangled quantum networks (cluster states) lie at the heart of recent approaches to quantum computing1,2. Yet the current approach for constructing optical quantum networks does so one node at a time3,4,5, which lacks scalability. Here, we demonstrate the single-step fabrication of a multimode quantum resource from the parametric downconversion of femtosecond-frequency combs. Ultrafast pulse shaping6 is employed to characterize the comb's spectral entanglement7,8. Each of the 511 possible bipartitions among ten spectral regions is shown to be entangled; furthermore, an eigenmode decomposition reveals that eight independent quantum channels9 (qumodes) are subsumed within the comb. This multicolour entanglement imports the classical concept of wavelength-division multiplexing to the quantum domain by playing upon frequency entanglement to enhance the capacity of quantum-information processing. The quantum frequency comb is easily addressable, robust with respect to decoherence and scalable, which renders it a unique tool for quantum information.
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This work is supported by the French National Research Agency project Qualitime as well as the European Research Council starting grant Frecquam. C.F. is a member of the Institut Universitaire de France. J.R. acknowledges support from the European Commission through Marie Curie Actions.
The authors declare no competing financial interests.
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Roslund, J., de Araújo, R., Jiang, S. et al. Wavelength-multiplexed quantum networks with ultrafast frequency combs. Nature Photon 8, 109–112 (2014). https://doi.org/10.1038/nphoton.2013.340
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