Automated equivalence checking of concurrent quantum systems

Ardeshir-Larijani, Ebrahim, Gay, Simon J. and Nagarajan, Rajagopal ORCID logoORCID: (2018) Automated equivalence checking of concurrent quantum systems. ACM Transactions on Computational Logic (TOCL), 19 (4) , 28. pp. 1-32. ISSN 1529-3785 [Article] (doi:10.1145/3231597)

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The novel field of quantum computation and quantum information has gathered significant momentum in the last few years. It has the potential to radically impact the future of information technology and in influence the development of modern society. The construction of practical, general purpose quantum computers has been challenging, but quantum cryptographic and communication devices have been available in the commercial marketplace for several years. Quantum networks have been built in various cities around the world and a dedicated satellite has been launched by China to provide secure quantum communication. Such new technologies demand rigorous analysis and verification before they can be trusted in safety- and security- critical applications. Experience with classical hardware and software systems has shown the difficulty of achieving robust and reliable implementations.

We present CCSq, a concurrent language for describing quantum systems, and develop verification techniques for checking equivalence between CCSq processes. CCSq has well-defined operational and superoperator semantics for protocols that are functional, in the sense of computing a deterministic input-output relation for all interleavings arising from concurrency in the system. We have implemented QEC (Quantum Equivalence Checker), a tool which takes the specification and implementation of quantum protocols, described in CCSq, and automatically checks their equivalence. For efficiency purposes, we restrict ourselves to Clifford operators in the stabilizer formalism, but we are able to verify protocols over all input states. We have specified and verified a collection of interesting and practical quantum protocols ranging from quantum communication and quantum cryptography to quantum error correction.

Item Type: Article
Research Areas: A. > School of Science and Technology > Computer Science > Foundations of Computing group
Item ID: 24406
Notes on copyright: © 2018 Association for Computing Machinery.
This is the author’s version of the work. It is posted here for your personal use. Not for redistribution. The definitive Version of Record was published in ACM Transactions on Computational Logic (Volume 19, Issue 4),
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Depositing User: Raja Nagarajan
Date Deposited: 25 Jun 2018 09:17
Last Modified: 29 Nov 2022 19:29

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