The Deutsch-Jozsa algorithm is a quantum algorithm, proposed by David Deutsch and Richard Jozsa in It was one of first examples of a. Ideas for quantum algorithm. ▫ Quantum parallelism. ▫ Deutsch-Jozsa algorithm. ▫ Deutsch’s problem. ▫ Implementation of DJ algrorithm. The Deutsch-Jozsa algorithm can determine whether a function mapping all bitstrings to a single bit is constant or balanced, provided that it is one of the two.

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Deutsch-Jozsa Algorithm — Grove documentation

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A constant function always maps to either 1 or 0, and a balanced function maps to 1 for half of algoeithm inputs and maps to 0 for the other half. For a conventional deterministic algorithm, 2n-1 evaluations of f will be required in the worst case.

Deutsch-Jozsa algorithm

All articles lacking reliable references Articles lacking reliable references from May All articles with dead external links Articles with dead external links from September Articles with permanently dead external links. Quantum circuit Quantum logic gate One-way quantum computer cluster state Adiabatic quantum computation Topological quantum computer.

Quantum computing Qubit physical vs. It was one of first examples of a quantum algorithm, which is a class of algorithms designed for execution on Quantum computers and have the potential to be more efficient than conventional, classical, algorithms by joozsa advantage of the quantum superposition and entanglement principles.

Constant means all inputs map to the same value, balanced means half of the inputs maps to one value, and half to the other. This algorithm is still referred to as Deutsch—Jozsa algorithm in honour of the groundbreaking techniques they employed. References David Deutsch, Richard Jozsa.


If it is algorothm, the function is constant, otherwise the function is balanced. The algorithm as Deutsch had originally proposed it was not, in fact, deterministic.

[] An elementary derivation of the Deutsch-Jozsa algorithm

Retrieved from ” https: Nielsen and Isaac L. This matrix is exponentially large, and thus even generating agorithm program will take exponential time. The Deutsch-Jozsa algorithm can determine whether a function mapping all bitstrings to a single bit is constant or balanced, provided that it is one of the two.

Rapid solutions of problems by quantum computation. Unlike Deutsch’s Algorithm, this algorithm required two function evaluations instead of only one.

The Deutsch—Jozsa problem is specifically designed to be easy for a quantum algorithm and hard for any deterministic classical algorithm. Finally, do Hadamards on the n inputs again, and measure the answer qubit. The algorithm was successful with a probability of one half.

The best case occurs where the function is balanced and the first two output values that happen to be selected are different. Universal quantum simulator Deutsch—Jozsa algorithm Grover’s algorithm Quantum Fourier transform Shor’s algorithm Simon’s problem Quantum phase estimation algorithm Quantum counting algorithm Quantum annealing Quantum algorithm for linear systems of equations Amplitude amplification.

First, do Hadamard transformations on n 0s, forming all possible inputs, and a single 1, which will be the answer qubit. Applying the quantum oracle gives. A Hadamard transform is applied to each bit to obtain the state. The algorithm is as follows. In Deutsch-Jozsa problem, we are given a black box computing a valued function f x1, x2, Chuang, “Quantum Computation and Quantum Information”, pages Some but not all of these transformations involve a scratch qubit, so room for one is always provided.


The Deutsch-Jozsa quantum algorithm produces an answer that is always correct with just 1 evaluation of f. For a conventional randomized algorithma constant number of evaluation suffices to produce the correct answer with a high probability but 2n-1 evaluations are still required if we want an answer that is always correct.

Applying this function to our current state we obtain. Specifically we were given a boolean function whose input is 1 bit, f: In the Deutsch-Jozsa problem, we are given a black box quantum computer known as an oracle that implements some function f: Archived from the original on It preceded other quantum algorithms such as Shor’s algorithm and Grover’s algorithm.

Read the Docs v: We know that the function in the black box is either constant 0 on all inputs or 1 on all inputs or balanced returns 1 for half the domain and 0 for the other half. Views Read Edit View history. At this point the last qubit may be ignored. Charge qubit Flux qubit Phase qubit Transmon. The black box takes n bits x1, x2, Further improvements to the Deutsch—Jozsa algorithm were made by Cleve et al.