The well-known inconvenience that a measurement on a quantum system will not leave it unchanged can be circumvented by turning a photon stream into an electrical current and then back again.
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Maddox, J. Unpackaging and repackaging photons. Nature 365, 601 (1993). https://doi.org/10.1038/365601a0
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DOI: https://doi.org/10.1038/365601a0