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Getting almost all the bits from a quantum random access code
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Getting almost all the bits from a quantum random access code
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A quantum random access code (QRAC) is a map $x\mapsto\rho_x$ that encodes $n$-bit strings $x$ into $m$-qubit quantum states $\rho_x$, in a way that allows us to recover any one bit of $x$ with success probability $\geq p$. The measurement on $\rho_x$ that is used to recover, say, $x_1$ may destroy all the information about the other bits; this is in fact what happens in the well-known QRAC that encodes $n=2$ bits into $m=1$ qubits. Does this generalize to large $n$, 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 $n$-bit string $x$ up to small Hamming distance, even for the worst-case $x$.
Forward citations
Cited by 3 Pith papers
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Demonstrating an unconditional separation between quantum and classical information resources
Demonstrates a task solvable with 12 qubits but requiring 62-382 classical bits of memory, yielding unconditional quantum information supremacy on a trapped-ion processor.
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Optimal Average Success Probabilities of Binary $(n,n-1)$ and $(n,n-2)$ Quantum Random Access Codes via a Proof of the Corresponding Conjectured Bound
The optimal average success probability of binary (n,n-1) and (n,n-2) QRACs equals exactly 1/2 + 1/2 sqrt(m/n).
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Classical codes violate the conjectured square-root bound for quantum random access codes
Classical random access codes with private randomness violate the conjectured (1+sqrt(m/n))/2 quantum random access code bound when embedded as diagonal quantum codes, for a full range of compression rates.
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