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Paper 1
Avoiding the Detector Blinding Attack on Quantum Cryptography
Z L Yuan, J F Dynes, A J Shields
- Year
- 2010
- Journal
- arXiv preprint
- DOI
- arXiv:1009.6130
- arXiv
- 1009.6130
We show the detector blinding attack by Lydersen et al [1] will be ineffective on most single photon avalanche photodiodes (APDs) and certainly ineffective on any detectors that are operated correctly. The attack is only successful if a redundant resistor is included in series with the APD, or if the detector discrimination levels are set inappropriately.
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Entanglement at the interplay between single- and many-bodyness
Jose Reslen
- Year
- 2022
- Journal
- arXiv preprint
- DOI
- arXiv:2209.04287
- arXiv
- 2209.04287
The tensor network representation of the ground state of a Bethe chain is analytically obtained and studied in relation to its entanglement distribution. Block entanglement displays a maximum at the interplay between single- and many-bodyness. In systems of two fermions, tensor networks describing ground states of interacting Hamiltonians cannot be written as a sequence of next-neighbor unitaries applied on an uncorrelated state, but need four-next-neighbor unitaries in addition. This differs from the idea that the ground state can be obtained as a sequence of next-neighbor operations applied on a tensor network. The work uncovers the transcendence of the notion of many-bodyness in the implementation of protocols based on matrix product states.
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