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Optical physics

A larger quantum alphabet

Quantum objects that can hold more information than quantum bits have been generated and manipulated in an integrated photonic platform, paving the way for advanced protocols in quantum information processing. See Letter p.622

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Figure 1: Generation of entangled photons for the multilevel encoding of information.


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  1. Kues, M. et al. Nature 546, 622–626 (2017).

    ADS  CAS  Article  Google Scholar 

  2. Ladd, T. D. et al. Nature 464, 45–53 (2010).

    ADS  CAS  Article  Google Scholar 

  3. O'Brien, J. L., Furusawa, A. & Vučković, J. Nature Photon. 3, 687–695 (2009).

    ADS  CAS  Article  Google Scholar 

  4. Tanzilli, S. et al. Laser Photon. Rev. 6, 115–143 (2012).

    ADS  Article  Google Scholar 

  5. Giovannetti, V., Lloyd, S. & Maccone, L. Science 306, 1330–1336 (2004).

    ADS  CAS  Article  Google Scholar 

  6. Ursin, R. et al. Nature Phys. 3, 481–486 (2007).

    ADS  CAS  Article  Google Scholar 

  7. Schaeff, C., Polster, R., Huber, M., Ramelow, S. & Zeilinger, A. Optica 2, 523–529 (2015).

    ADS  Article  Google Scholar 

  8. Thew, R., Acin, A., Zbinden, H. & Gisin, N. Quantum Inf. Comput. 4, 93–101 (2004).

    MathSciNet  Google Scholar 

  9. Somaschi, N. et al. Nature Photon. 10, 340–345 (2016).

    ADS  CAS  Article  Google Scholar 

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Correspondence to Roberto Osellame.

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Osellame, R. A larger quantum alphabet. Nature 546, 602–603 (2017).

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