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State Convertibility in the von Neumann Algebra Framework

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Abstract

We establish a generalisation of the fundamental state convertibility theorem in quantum information to the context of bipartite quantum systems modelled by commuting semi-finite von Neumann algebras. Namely, we establish a generalisation to this setting of Nielsen’s theorem on the convertibility of quantum states under local operations and classical communication (LOCC) schemes. Along the way, we introduce an appropriate generalisation of LOCC operations and connect the resulting notion of approximate convertibility to the theory of singular numbers and majorisation in von Neumann algebras. As an application of our result in the setting of \(\mathrm {II}_1\)-factors, we show that the entropy of the singular value distribution relative to the unique tracial state is an entanglement monotone in the sense of Vidal, thus yielding a new way to quantify entanglement in that context. Building on previous work in the infinite-dimensional setting, we show that trace vectors play the role of maximally entangled states for general \(\mathrm {II}_1\)-factors. Examples are drawn from infinite spin chains, quasi-free representations of the CAR, and discretised versions of the CCR.

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Acknowledgements

The authors are grateful for the reviewers’ comments, which improved the overall presentation of the paper. J.C. was partially supported by NSERC Discovery Grant RGPIN-2017-06275. D.W.K. was partly supported by NSERC Discovery Grant 400160 and by a Royal Society Grant allowing research visits to Queen’s University Belfast. R.H.L. was partly supported by UCD Seed Funding.

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Authors and Affiliations

  1. School of Mathematics and Statistics, Carleton University, Ottawa, ON, H1S 5B6, Canada

    Jason Crann

  2. Department of Mathematics and Statistics, University of Guelph, Guelph, ON, N1G 2W1, Canada

    David W. Kribs

  3. Institute for Quantum Computing, University of Waterloo, Waterloo, ON, N2L 3G1, Canada

    David W. Kribs

  4. School of Mathematics and Statistics, University College Dublin, Belfield, Dublin 4, Ireland

    Rupert H. Levene

  5. Mathematical Sciences Research Centre, Queen’s University Belfast, Belfast, BT7 1NN, UK

    Ivan G. Todorov

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  1. Jason Crann
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  2. David W. Kribs
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  3. Rupert H. Levene
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  4. Ivan G. Todorov
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Correspondence to Jason Crann.

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Communicated by M. M. Wolf.

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Crann, J., Kribs, D.W., Levene, R.H. et al. State Convertibility in the von Neumann Algebra Framework. Commun. Math. Phys. 378, 1123–1156 (2020). https://doi.org/10.1007/s00220-020-03803-3

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