Quantum Advantage for Shared Randomness Generation

• URL: http://arxiv.org/abs/2001.01889v4
• Date: Fri, 22 Oct 2021 16:22:48 GMT
• Title: Quantum Advantage for Shared Randomness Generation
• Authors: Tamal Guha, Mir Alimuddin, Sumit Rout, Amit Mukherjee, Some Sankar Bhattacharya, Manik Banik
• Abstract summary: We show that quantum systems provide an advantage over their classical counterpart. In a resource theoretic set-up, this feature of quantum systems can be interpreted as an advantage in winning a two players co-operative game. Protocols presented here are noise-robust and hence should be realizable with state-of-the-art quantum devices.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Sharing correlated random variables is a resource for a number of information theoretic tasks such as privacy amplification, simultaneous message passing, secret sharing and many more. In this article, we show that to establish such a resource called shared randomness, quantum systems provide an advantage over their classical counterpart. Precisely, we show that appropriate albeit fixed measurements on a shared two-qubit state can generate correlations which cannot be obtained from any possible state on two classical bits. In a resource theoretic set-up, this feature of quantum systems can be interpreted as an advantage in winning a two players co-operative game, which we call the `non-monopolize social subsidy' game. It turns out that the quantum states leading to the desired advantage must possess non-classicality in the form of quantum discord. On the other hand, while distributing such sources of shared randomness between two parties via noisy channels, quantum channels with zero capacity as well as with classical capacity strictly less than unity perform more efficiently than the perfect classical channel. Protocols presented here are noise-robust and hence should be realizable with state-of-the-art quantum devices.

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