Ah! How about you also transmit information in the polarisation of the light? Either as well as the vampireness of the photon, or just use polarised S (or R) photons. Then you can't use a vampire to split the light and get the polarity, because R and S photons don't split.
(Unless there are nestedly RRRSR-photons, but I think we thought Rness and Sness are idempotent...)
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Ah! How about you also transmit information in the polarisation of the light? Either as well as the vampireness of the photon, or just use polarised S (or R) photons. Then you can't use a vampire to split the light and get the polarity, because R and S photons don't split.
(Unless there are nestedly RRRSR-photons, but I think we thought Rness and Sness are idempotent...)