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- W1664860149 abstract "We investigate macroscopic entanglement of quantum states in quantum computers, where we say a quantum state is entangled macroscopically if the state has superposition of macroscopically distinct states. The index $p$ of the macroscopic entanglement is calculated as a function of the step of the computation, for Grover's quantum search algorithm and Shor's factoring algorithm. It is found that whether macroscopically entangled states are used or not depends on the numbers and properties of the solutions to the problem to be solved. When the solutions are such that the problem becomes hard in the sense that classical algorithms take more than polynomial steps to find a solution, macroscopically entangled states are always used in Grover's algorithm and almost always used in Shor's algorithm. Since they are representative algorithms for unstructured and structured problems, respectively, our results support strongly the conjecture that quantum computers utilize macroscopically entangled states when they solve hard problems much faster than any classical algorithms." @default.
- W1664860149 created "2016-06-24" @default.
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- W1664860149 date "2005-05-09" @default.
- W1664860149 modified "2023-09-27" @default.
- W1664860149 title "Macroscopic entanglement in Quantum Computation" @default.
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- W1664860149 hasPublicationYear "2005" @default.
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