Simple exact quantum search

While Grover’s search algorithm is asymptotically optimal, it does not always result in a real solution. If the search fails, the algorithm must be ran again from the beginning, conditionally doubling the effective number of oracle calls. Previous research attempted to fix this issue by modifying th...

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Published in:Quantum information processing Vol. 23; no. 10
Main Authors: Guţoiu, Raj Alexandru, Tănăsescu, Andrei, Popescu, Pantelimon George
Format: Journal Article
Language:English
Published: New York Springer US 18-10-2024
Springer Nature B.V
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Abstract While Grover’s search algorithm is asymptotically optimal, it does not always result in a real solution. If the search fails, the algorithm must be ran again from the beginning, conditionally doubling the effective number of oracle calls. Previous research attempted to fix this issue by modifying the oracle or alternating between numerically optimized reflectors. In this paper, we present an optimal initial state and reflector that produce an exact search with Grover’s algorithm at the cost of at most one additional oracle call beyond the optimum, a cost which can be nullified if we know a non-solution. We do this without modifying the oracle, without changing the diffuser at each step and even without any numerical optimization procedure required.
AbstractList While Grover’s search algorithm is asymptotically optimal, it does not always result in a real solution. If the search fails, the algorithm must be ran again from the beginning, conditionally doubling the effective number of oracle calls. Previous research attempted to fix this issue by modifying the oracle or alternating between numerically optimized reflectors. In this paper, we present an optimal initial state and reflector that produce an exact search with Grover’s algorithm at the cost of at most one additional oracle call beyond the optimum, a cost which can be nullified if we know a non-solution. We do this without modifying the oracle, without changing the diffuser at each step and even without any numerical optimization procedure required.
ArticleNumber 356
Author Tănăsescu, Andrei
Popescu, Pantelimon George
Guţoiu, Raj Alexandru
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  givenname: Pantelimon George
  surname: Popescu
  fullname: Popescu, Pantelimon George
  email: pgpopescu@upb.ro
  organization: Computer Science and Engineering Department, National University of Science and Technology POLITEHNICA Bucharest
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Keywords Success rate
Grover algorithm
Restricted oracle
Quantum search
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Snippet While Grover’s search algorithm is asymptotically optimal, it does not always result in a real solution. If the search fails, the algorithm must be ran again...
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SubjectTerms Data Structures and Information Theory
Diffusers
Mathematical Physics
Optimization
Physics
Physics and Astronomy
Quantum Computing
Quantum Information Technology
Quantum Physics
Reflectors
Search algorithms
Spintronics
Title Simple exact quantum search
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