Communicating quantum processes

We define a language CQP (Communicating Quantum Processes) for modelling systems which combine quantum and classical communication and computation. CQP combines the communication primitives of the pi-calculus with primitives for measurement and transformation of quantum state; in particular, 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 state. 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.

• Type: Conference
• Year: 2005
• Where: POPL
• Authors: Simon J. Gay, Rajagopal Nagarajan
• Keywords: Classical Data, POPL 2005, Programming Languages, Quantum State, Static Type