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- W4291330246 abstract "How well can we approximate a quantum channel output state using a random codebook with a certain size? In this work, we study the quantum soft covering problem. Namely, we use a random codebook with codewords independently sampled from a prior distribution and send it through a classical-quantum channel to approximate the target state. When using a random codebook sampled from an independent and identically distributed prior with a rate above the quantum mutual information, we show that the expected trace distance between the codebook-induced state and the target state decays with exponent given by the sandwiched R'enyi information. On the other hand, when the rate of the codebook size is below the quantum mutual information, the trace distance converges to one exponentially fast. We obtain similar results when using a random constant composition codebook, whereas the sandwiched Augustin information expresses the error exponent. In addition to the above large deviation analysis, our results also hold in the moderate deviation regime. That is, we show that even when the rate of the codebook size approaches the quantum mutual information moderately quickly, the trace distance still vanishes asymptotically." @default.
- W4291330246 created "2022-08-14" @default.
- W4291330246 creator A5039441880 @default.
- W4291330246 creator A5048882236 @default.
- W4291330246 date "2022-02-22" @default.
- W4291330246 modified "2023-09-29" @default.
- W4291330246 title "Error Exponent and Strong Converse for Quantum Soft Covering" @default.
- W4291330246 doi "https://doi.org/10.48550/arxiv.2202.10995" @default.
- W4291330246 hasPublicationYear "2022" @default.
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