Quantum Alice and silent Bob: Qubit-based quantum key recycling with almost no classical communication

Daan Leermakers (Corresponding author), Boris Škorić (Corresponding author)

Research output: Contribution to journalArticleAcademicpeer-review

Abstract

We answer an open question about Quantum Key Recycling (QKR): Is it possible to put the message entirely in the qubits without increasing the number of qubits compared to existing QKR schemes? We show that this is indeed possible. We introduce a prepare-and-measure QKR protocol where the communication from Alice to Bob consists entirely of qubits. As usual, Bob responds with an authenticated one-bit accept/reject classical message. Compared to Quantum Key Distribution (QKD), QKR has reduced round complex-ity. Compared to previous qubit-based QKR protocols, our scheme has far less classical communication. We provide a security proof in the universal composability framework and find that the communication rate is asymptotically the same as for QKD with one-way postpro-cessing.

Original languageEnglish
Pages (from-to)1-18
Number of pages18
JournalQuantum Information and Computation
Volume21
Issue number1-2
DOIs
Publication statusPublished - 2021

Keywords

  • Quantum cryptogtraphy
  • Quantum Key Recycling

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