论文标题

当地同时国家歧视的平行重复

Parallel repetition of local simultaneous state discrimination

论文作者

Escolà-Farràs, Llorenç, Has, Jaròn, Ozols, Maris, Schaffner, Christian, Tahmasbi, Mehrdad

论文摘要

局部同时国家歧视(LSSD)是量子信息处理中最近引入的问题。它的古典版本是由非社交球员对裁判进行的非本地游戏。基于已知的概率分布,裁判为每个玩家生成一个输入,并保留一个秘密价值。球员必须猜测裁判的价值并赢得胜利。对于此游戏,我们调查了无信号策略的优势,而不是古典策略。我们从数字上表明,对于三个播放器和二进制价值观,无标志性策略不能对经典的策略提供任何改进。对于基于二进制对称频道的某些LSSD游戏,我们表明,当游戏的多个同时实例播放时,严格的签名策略会更好。该游戏的良好经典策略可以通过代码来定义,并通过列表编码方案来定义良好的无信号策略。我们将此示例游戏扩展到由任意渠道定义的一类游戏,并扩展了使用代码并列表解码来定义这些游戏多个同时实例的策略的想法。最后,我们为经典获胜概率指数的限制提供了一种表达,并表明基于列表编码方案的无信号策略达到了这一限制。

Local simultaneous state discrimination (LSSD) is a recently introduced problem in quantum information processing. Its classical version is a non-local game played by non-communicating players against a referee. Based on a known probability distribution, the referee generates one input for each of the players and keeps one secret value. The players have to guess the referee's value and win if they all do so. For this game, we investigate the advantage of no-signalling strategies over classical ones. We show numerically that for three players and binary values, no-signalling strategies cannot provide any improvement over classical ones. For a certain LSSD game based on a binary symmetric channel, we show that no-signalling strategies are strictly better when multiple simultaneous instances of the game are played. Good classical strategies for this game can be defined by codes, and good no-signalling strategies by list-decoding schemes. We expand this example game to a class of games defined by an arbitrary channel, and extend the idea of using codes and list decoding to define strategies for multiple simultaneous instances of these games. Finally, we give an expression for the limit of the exponent of the classical winning probability, and show that no-signalling strategies based on list-decoding schemes achieve this limit.

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