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QUantum sort

Jayesh A Lalwani

Joined: Jan 17, 2008
Posts: 2553

Scientists have discovered a way to sort an array in O(n) time using a quantum computer. The algorithm of the program is

a) Use a quantum computer to shuffle an unsorted array
b) Check if the array is sorted
c) If not sorted, destroy the universe

By the multi-worlds interpretation of quantum theory, the quantum sorting of the array will create 2^(N-1) universes, out of which one will have the array sorted. All the other universes will destroy themselves.

Campbell Ritchie

Joined: Oct 13, 2005
Posts: 41541
That is analogous to using quantum computing to crack RSA cyphers. The quantum computer produces a solution corresponding to every one of the 2¹⁰²⁴ or however many possible keys. Then you only have to read every one to work out which is the correct decryption
Jesper de Jong
Java Cowboy
Saloon Keeper

Joined: Aug 16, 2005
Posts: 14656

From XKCD:

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subject: QUantum sort