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.
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XOR games are often introduced replacing \(\{-1,1\}\) by \(\{0,1\}\) and replacing the product by the XOR of the variables. In that case, our value of the game translates into the bias, the additional probability over \(\frac{1}{2}\) of winning the game.
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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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Marius Junge is partially supported by NSF DMS-1201886. Carlos Palazuelos is partially supported by the Spanish “Ramón y Cajal program” (RYC-2012-10449). Marius Junge and Carlos Palazuelos are partially supported by the Spanish “Severo Ochoa Programe” for Centres of Excellence (SEV-2015-0554). Carlos Palazuelos and Ignacio Villanueva are partially supported by the Grants MTM2014-54240-P, funded by Spanish MINECO, and QUITEMAD+-CM, S2013/ICE-2801, funded by Comunidad de Madrid.
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Junge, M., Palazuelos, C. & Villanueva, I. Classical versus quantum communication in XOR games. Quantum Inf Process 17, 117 (2018). https://doi.org/10.1007/s11128-018-1883-0
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DOI: https://doi.org/10.1007/s11128-018-1883-0