Getting almost all the bits from a quantum random access code
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Abstract
A quantum random access code (QRAC) is a map that encodes -bit strings into -qubit quantum states , in a way that allows us to recover any one bit of with success probability . The measurement on that is used to recover, say, may destroy all the information about the other bits; this is in fact what happens in the well-known QRAC that encodes bits into qubits. Does this generalize to large , i.e., could there exist QRACs that are so "obfuscated" that one cannot get much more than one bit out of them? Here we show that this is not the case: for every QRAC there exists a measurement that (with high probability) recovers the full -bit string up to small Hamming distance, even for the worst-case .
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