Fault tolerant quantum data locking

• URL: http://arxiv.org/abs/2003.11470v3
• Date: Sat, 22 May 2021 04:26:35 GMT
• Title: Fault tolerant quantum data locking
• Authors: Zixin Huang, Pieter Kok, Cosmo Lupo
• Abstract summary: We present a quantum data locking protocol that employs pseudo-random circuits consisting of Clifford gates only. We show that information can be encrypted into $n$-qubit code words using order $n. As an application, we discuss an efficient method for encrypting the output of a quantum computer.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: 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 pseudo-random 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 $n - H_\mathrm{min}(\mathsf{X})$ secret bits, where $H_\mathrm{min}(\mathsf{X})$ 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.

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