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Classical versus quantum communication in XOR games

  • Marius Junge
  • Carlos Palazuelos
  • Ignacio Villanueva
Article
  • 156 Downloads

Abstract

We introduce an intermediate setting between quantum nonlocality and communication complexity problems. More precisely, we study the value of XOR games when Alice and Bob are allowed to use a limited amount (c bits) of one-way classical communication compared to their value when they are allowed to use the same amount of one-way quantum communication (c qubits). The key quantity here is the ratio between the quantum and classical value. We provide a universal way to obtain Bell inequality violations of general Bell functionals from XOR games for which the previous quotient is larger than 1. This allows, in particular, to find (unbounded) Bell inequality violations from communication complexity problems in the same spirit as the recent work by Buhrman et al. (PNAS 113(12):3191–3196, 2016). We also provide an example of a XOR game for which the previous quotient is optimal (up to a logarithmic factor) in terms of the amount of information c. Interestingly, this game has only polynomially many inputs per player. For the related problem of separating the classical versus quantum communication complexity of a function, the known examples attaining exponential separation require exponentially many inputs per party.

Keywords

Quantum information Quantum communication XOR games 

Notes

Acknowledgements

Funding was provided by National Science Foundation (Grant No. NSF DMS-1201886) and Ministerio de Economía y Competitividad (Grant Nos. RYC-2012-10449, MTM2014-54240-P, SEV-2015-0554).

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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Department of MathematicsUniversity of Illinois at Urbana-ChampaignUrbanaUSA
  2. 2.Instituto de Ciencias Matemáticas (ICMAT), Campus de CantoblancoMadridSpain
  3. 3.Departamento de Análisis Matemático, Facultad de Ciencias MatemáticasUniversidad Complutense de MadridMadridSpain
  4. 4.Instituto de Matemática Interdisciplinar (IMI)Universidad Complutense de MadridMadridSpain

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