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Are problems in Quantum Information Theory (un)decidable?



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Wolf, Michael M. and Cubitt, Toby S. and Pérez García, David (2011) Are problems in Quantum Information Theory (un)decidable? (Unpublished)


Official URL: http://arxiv.org/abs/1111.5425v1


This note is intended to foster a discussion about the extent to which typical problems arising in quantum information theory are algorithmically decidable (in principle rather than in practice). Various problems in the context of entanglement theory and quantum channels turn out to be decidable via quantifier elimination as long as they admit a compact formulation without quantification over integers. For many asymptotically defined properties which have to hold for all or for one n € N, however, effective procedures seem to be difficult if not impossible to find. We review some of the main tools for (dis)proving decidability and apply them to problems in quantum information theory. We find that questions like ”can we overcome fidelity 1/2 w.r.t. a two-qubit singlet state?” easily become undecidable. A closer look at such questions might rule out some of the “single-letter” formulas sought in quantum information theory.

Item Type:Article
Subjects:Sciences > Physics > Mathematical physics
Sciences > Physics > Quantum theory
ID Code:27996
Deposited On:13 Feb 2015 13:35
Last Modified:13 Feb 2015 13:35

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