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Types and typechecking for communicating quantum processes

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Gay, Simon J. and Nagarajan, Rajagopal (2006) Types and typechecking for communicating quantum processes. In: 2nd International Workshop on Quantum Programming Languages (QPL 2004), Turku, Finland, 12-13 July, 2004 doi:10.1017/S0960129506005263

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Abstract

We define a language CQP (Communicating Quantum Processes) for modelling systems that combine quantum and classical communication and computation. CQP combines the communication primitives of the pi-calculus with primitives for measurement and transformation of the quantum state; in particular, quantum bits (qubits) can be transmitted from process to process along communication channels. CQP has a static type system, which classifies channels, distinguishes between quantum and classical data, and controls the use of quantum states. We formally define the syntax, operational semantics and type system of CQP, prove that the semantics preserves typing, and prove that typing guarantees that each qubit is owned by a unique process within a system. We also define a typechecking algorithm and prove that it is sound and complete with respect to the type system. We illustrate CQP by defining models of several quantum communication systems, and outline our plans for using CQP as the foundation for formal analysis and verification of combined quantum and classical systems.

Item Type:

Conference Item (Paper)

Subjects:

Q Science > QA Mathematics > QA76 Electronic computers. Computer science. Computer software

Divisions:

Faculty of Science, Engineering and Medicine > Science > Computer Science

Official Date:

June 2006

Dates: