核心概念
Grover's algorithm is optimal for solving NP-complete problems, but NP-hard problems cannot be efficiently solved in BQP.
要約
1. Abstract:
- Grover's algorithm is efficient for NP-complete problems on quantum computers.
- The algorithm requires exponential time due to the BBBV theorem.
2. Introduction:
- Quantum computers can simulate classical computers efficiently.
- No efficient quantum algorithm exists for NP-hard problems.
3. Notations and Preliminaries:
- Definitions of Turing machines and languages.
- CE contains all c.e. sets.
4. NP versus BQP:
- The set DM is not computable, while UM is computable.
- Theorem 2 states that testing whether (1n, 1t) ∈ UM cannot be done faster than with a black box search.
5. Conclusion:
- The paper addresses the P vs. NP problem.
- The proof method avoids the relativization barrier.
統計
Grover's algorithm can find an element x in Θ(2n/2) accesses to f.
A quantum computer needs at least Ω(2n/2) accesses to the black box.
引用
"Experts agree that one cannot solve problems like P vs. NP with simple computability tricks." - Anonymous