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Quantum parity algorithms as oracle calls, and application in Grover Database searchKeywords: parity , quantum computing , oracle. Abstract: This paper discusses the determination of the parity of a string of N binary digits, the well-known problem in classical as well as quantum information processing. It can be formulated as an oracle problem. It has been established that quantum algorithms require at least N /2 oracle calls. We present an algorithm that reaches this lower bound and is also optimal in terms of additional gate operations required.
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