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A fully abstract model for quantum controlled lambda calculus

Alejandro Díaz-Caro, Octavio Malherbe

Published Jun 1, 2018• 1 citation
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Pierre Clairambault, Marc de Visme

Quantum programming languages permit a hardware independent, high-level description of quantum algorithms. In particular, the quantum λ-calculus is a higher-order language with quantum primitives, mixing quantum data and classical control. Giving satisfactory denotational semantics to the quantum λ-calculus is a challenging problem that has attracted significant interest. In the past few years, both static (the quantum relational model) and dynamic (quantum game semantics) denotational models were given, with matching computational adequacy results. However, no model was known to be fully abstract. Our first contribution is a full abstraction result for the games model of the quantum λ-calculus. Full abstraction holds with respect to an observational quotient of strategies, obtained by summing valuations of all states matching a given observable. Our proof method for full abstraction extends a technique recently introduced to prove full abstraction for probabilistic coherence spaces with respect to probabilistic PCF. Our second contribution is an interpretation-preserving functor from quantum games to the quantum relational model, extending a long line of work on connecting static and dynamic denotational models. From this, it follows that the quantum relational model is fully abstract as well. Altogether, this gives a complete denotational landscape for the semantics of the quantum λ-calculus, with static and dynamic models related by a clean functorial correspondence, and both fully abstract.

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On a Fully Abstract Model for a Quantum Linear Functional Language

Peter Selinger, Benoît Valiron

This paper studies the linear fragment of the programing language for quantum computation with classical control described in [Selinger, P. and B. Valiron, A lambda calculus for quantum computation with classical control, in: P. Urzyczyn, editor, Proceedings of the Seventh International Conference on Typed Lambda Calculi and Applications (TLCA 2005), Lecture Notes in Computer Science 3461 (2005), pp. 354–368]. We sketch the language, and discuss equivalence of terms. We also describe a fully abstract denotational semantics based on completely positive maps.

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Quantum programming languages permit a hardware independent, high-level description of quantum algorithms. In particular, the quantum λ-calculus is a higher-order language with quantum primitives, mixing quantum data and classical control. Giving satisfactory denotational semantics to the quantum λ-calculus is a challenging problem that has attracted significant interest. In the past few years, both static (the quantum relational model) and dynamic (quantum game semantics) denotational models were given, with matching computational adequacy results. However, no model was known to be fully abstract. Our first contribution is a full abstraction result for the games model of the quantum λ-calculus. Full abstraction holds with respect to an observational quotient of strategies, obtained by summing valuations of all states matching a given observable. Our proof method for full abstraction extends a technique recently introduced to prove full abstraction for probabilistic coherence spaces with respect to probabilistic PCF. Our second contribution is an interpretation-preserving functor from quantum games to the quantum relational model, extending a long line of work on connecting static and dynamic denotational models. From this, it follows that the quantum relational model is fully abstract as well. Altogether, this gives a complete denotational landscape for the semantics of the quantum λ-calculus, with static and dynamic models related by a clean functorial correspondence, and both fully abstract.
This paper studies the linear fragment of the programing language for quantum computation with classical control described in [Selinger, P. and B. Valiron, A lambda calculus for quantum computation with classical control, in: P. Urzyczyn, editor, Proceedings of the Seventh International Conference on Typed Lambda Calculi and Applications (TLCA 2005), Lecture Notes in Computer Science 3461 (2005), pp. 354–368]. We sketch the language, and discuss equivalence of terms. We also describe a fully abstract denotational semantics based on completely positive maps.