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quant-ph2002
Quantum Zero-Error Algorithms Cannot be Composed
Harry Buhrman, Ronald de Wolf
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-e…
quant-ph2002
Exponential Lower Bound for 2-Query Locally Decodable Codes via a Quantum Argument
Iordanis Kerenidis, Ronald de Wolf
A locally decodable code encodes n-bit strings x in m-bit codewords C(x), in such a way that one can recover any bit x_i from a corrupted codeword by querying only a few bits of th…