Accessing inaccessible information via quantum indistinguishability

Sebastian Horvat (Corresponding author), Borivoje Dakić

Publications: Contribution to journalArticlePeer Reviewed


In this paper we present and analyze an information-theoretic task that consists in learning a bit of information by spatially moving the ‘target’ particle that encodes it. We show that, on one hand, the task can be solved with the use of additional independently prepared quantum particles, only if these are indistinguishable from the target particle. On the other hand, the task can be solved with the use of distinguishable quantum particles, only if they are entangled with the target particle. Our task thus provides a new example in which the entanglement apparently inherent to independently prepared indistinguishable quantum particles is put into use for information processing. Importantly, a novelty of our protocol lies in that it does not require any spatial overlap between the involved particles. Besides analyzing the class of quantum-mechanical protocols that solve our task, we gesture towards possible ways of generalizing our results and of applying them in cryptography.
Original languageEnglish
Article number113008
Number of pages13
JournalNew Journal of Physics
Issue number11
Publication statusPublished - Nov 2023

Austrian Fields of Science 2012

  • 103025 Quantum mechanics


  • entanglement
  • indistinguishable particles
  • quantum information


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