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- W2950240160 abstract "Random access coding is an information task that has been extensively studied and found many applications in quantum information. In this scenario, Alice receives an n-bit string x, and wishes to encode x into a quantum state , such that Bob, when receiving the state , can choose any bit and recover the input bit xi with high probability. Here we study two variants: parity-oblivious random access codes (RACs), where we impose the cryptographic property that Bob cannot infer any information about the parity of any subset of bits of the input apart from the single bits xi; and even-parity-oblivious RACs, where Bob cannot infer any information about the parity of any even-size subset of bits of the input. In this paper, we provide the optimal bounds for parity-oblivious quantum RACs and show that they are asymptotically better than the optimal classical ones. Our results provide a large non-contextuality inequality violation and resolve the main open problem in a work of Spekkens et al (2009 Phys. Rev. Lett.102 010401). Second, we provide the optimal bounds for even-parity-oblivious RACs by proving their equivalence to a non-local game and by providing tight bounds for the success probability of the non-local game via semidefinite programming. In the case of even-parity-oblivious RACs, the cryptographic property holds also in the device independent model." @default.
- W2950240160 created "2019-06-27" @default.
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- W2950240160 date "2016-04-08" @default.
- W2950240160 modified "2023-10-18" @default.
- W2950240160 title "Optimal bounds for parity-oblivious random access codes" @default.
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- W2950240160 doi "https://doi.org/10.1088/1367-2630/18/4/045003" @default.
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