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Getting almost all the bits from a quantum random access code

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arxiv 2506.01903 v1 pith:CUT3BE63 submitted 2025-06-02 quant-ph cs.IR

Getting almost all the bits from a quantum random access code

classification quant-ph cs.IR
keywords bitsqracquantumaccesscodeencodesmeasurementprobability
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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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 $x$.

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Cited by 3 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score.

  1. Demonstrating an unconditional separation between quantum and classical information resources

    quant-ph 2025-09 unverdicted novelty 7.0

    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.

  2. 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

    quant-ph 2026-07 accept novelty 6.5

    The optimal average success probability of binary (n,n-1) and (n,n-2) QRACs equals exactly 1/2 + 1/2 sqrt(m/n).

  3. Classical codes violate the conjectured square-root bound for quantum random access codes

    quant-ph 2026-07 accept novelty 6.0

    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.