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Quantum Zero-Error Algorithms Cannot be Composed

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abstract

We exhibit two black-box problems, both of which have an efficient quantum algorithm with zero-error, yet whose composition does not have an efficient quantum algorithm with zero-error. This shows that quantum zero-error algorithms cannot be composed. In oracle terms, we give a relativized world where ZQP^{ZQP}\=ZQP, while classically we always have ZPP^{ZPP}=ZPP.

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quant-ph 1

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2025 1

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UNVERDICTED 1

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Composing Quantum Algorithms

quant-ph · 2025-02-13 · unverdicted · novelty 2.0

A survey explaining that bounded-error quantum algorithms can be composed without the log factor that classical randomized composition requires, using the transducer model.

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  • Composing Quantum Algorithms quant-ph · 2025-02-13 · unverdicted · none · ref 6 · internal anchor

    A survey explaining that bounded-error quantum algorithms can be composed without the log factor that classical randomized composition requires, using the transducer model.