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Quantum information processing

Two become one

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Scientists experimentally demonstrate a scheme that allows the number of qubits encoded per photon to be varied while keeping the overall quantum information constant. They also propose the inverse 'splitting' process.

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Figure 1: The quantum joining process transfers the qubits carried by two incoming photons to a four-dimensional qudit of a single photon.
Figure 2: Conceptual implementation of the quantum joining of two polarization qubits (t and c) to a path-polarization qudit (t1–t2).

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Authors and Affiliations

  1. Jonas Schou Neergaard-Nielsen is at the Department of Physics, Technical University of Denmark, Fysikvej, 2800 Kgs. Lyngby, Denmark,

    Jonas Schou Neergaard-Nielsen

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  1. Jonas Schou Neergaard-Nielsen
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Correspondence to Jonas Schou Neergaard-Nielsen.

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Neergaard-Nielsen, J. Two become one. Nature Photon 7, 512–513 (2013). https://doi.org/10.1038/nphoton.2013.169

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