State Decoding in Multi-Stage Cryptography Protocols
This provides a practical method for state decoding in quantum cryptography, but it is incremental as it builds on existing assumptions about fixed polarization planes.
The paper tackles the problem of quantum tomography for decoding photon states in multi-stage cryptography protocols, showing that with 2m polarization angles in a fixed plane, it requires m filters and m² photons per filter.
This paper presents a practical method of quantum tomography for decoding the state of photons in a multistage cryptography protocol. This method works if the polarization angles are defined on a fixed plane, as is assumed in several quantum cryptography protocols. We show if there are 2m polarization angles in a fixed plane, we need m number of filters and m2 number of photons through each filter.