Paper 2021/191

PT-Symmetric Quantum State Discrimination for Attack on BB84 Quantum Key Distribution

Yaroslav Balytskyi, Manohar Raavi, Anatoliy Pinchuk, and Sang-Yoon Chang


Quantum Key Distribution or QKD provides symmetric key distribution using the quantum mechanics/channels with new security properties. The security of QKD relies on the difficulty of the quantum state discrimination problem. We discover that the recent developments in PT symmetry can be used to expedite the quantum state discrimination problem and therefore to attack the BB84 QKD scheme. We analyze the security of the BB84 scheme and show that the attack significantly increases the eavesdropping success rate over the previous Hermitian quantum state discrimination approach. We design and analyze the approaches to attack BB84 QKD protocol exploiting an extra degree of freedom provided by the PT-symmetric quantum mechanics.

Available format(s)
Public-key cryptography
Publication info
Preprint. Minor revision.
Quantum Key DistributionBB84Quantum State DiscriminationPT symmetry.
Contact author(s)
ybalytsk @ uccs edu
mraavi @ uccs edu
apinchuk @ uccs edu
schang2 @ uccs edu
2021-02-24: received
Short URL
Creative Commons Attribution


      author = {Yaroslav Balytskyi and Manohar Raavi and Anatoliy Pinchuk and Sang-Yoon Chang},
      title = {PT-Symmetric Quantum State Discrimination for Attack on BB84 Quantum Key Distribution},
      howpublished = {Cryptology ePrint Archive, Paper 2021/191},
      year = {2021},
      note = {\url{}},
      url = {}
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