Abstract
The phenomenon of quantum erasure has long intrigued physicists, but has surprisingly found limited practical application. Here, we propose an erasure-based protocol for quantum key distribution (QKD) that promises inherent security against detector attacks.
Highlights
Ideas at the root of quantum erasure were already at play in the famous Bohr-Einstein dialogue in the 1920’s
Bohr countered, arguing that Heisenberg’s uncertainty principle would prevent one from doing exactly that. As it later turned out, the deeper explanation was not uncertainty but rather entanglement—a concept Einstein himself helped put on the map in the EPR paper [2]
The idea was that which-path information can be inferred without disturbing the trajectory of individual particles, circumventing the uncertainty argument
Summary
Ideas at the root of quantum erasure were already at play in the famous Bohr-Einstein dialogue in the 1920’s. By assuming that Alice has sent the other entangled state, in this case the one corresponding to Alice sending in her photon from the top and not applying her rotations, Eve is correct with probability 1/2.
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