Fault-tolerant quantum data locking

Zixin Huang*, Pieter Kok, Cosmo Lupo

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)
7 Downloads (Pure)


Quantum data locking is a quantum communication primitive that allows the use of a short secret key to encrypt a much longer message. It guarantees information-theoretical security against an adversary with limited quantum memory. Here we present a quantum data locking protocol that employs pseudorandom circuits consisting of Clifford gates only, which are much easier to implement fault tolerantly than universal gates. We show that information can be encrypted into n-qubit code words using order n - H-min(X) secret bits, where H-min(X) is the min-entropy of the plain text, and a min-entropy smaller than n accounts for information leakage to the adversary. As an application, we discuss an efficient method for encrypting the output of a quantum computer.

Original languageEnglish
Article number052611
Pages (from-to)052611-1- 052611-8
Number of pages8
JournalPhysical Review A: covering atomic, molecular, and optical physics and quantum information
Issue number5
Publication statusPublished - 24 May 2021

Bibliographical note

Copyright ©2021 American Physical Society. Firstly published in Physical Review A, 103(5), 052611. The original publication is available at https://doi.org/10.1103/PhysRevA.103.052611. Version archived for private and non-commercial use with the permission of the author/s and according to publisher conditions. For further rights please contact the publisher.


Dive into the research topics of 'Fault-tolerant quantum data locking'. Together they form a unique fingerprint.

Cite this