October 4, 2020

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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Finally, do Hadamards on the n inputs again, and measure the answer qubit.

Retrieved from ” https: Next, run the function once; this XORs the result with the answer qubit. Chuang, “Quantum Computation and Quantum Information”, pages First, do Hadamard transformations on n 0s, forming all possible inputs, and a single 1, iozsa will be the answer qubit. The motivation is to show a algorkthm box problem that can be solved efficiently by a quantum computer with no error, whereas a deterministic classical computer would need a large number of queries to the black box to solve the problem.

Since the problem is easy to solve on a probabilistic classical computer, it does not yield an oracle separation with BPPthe class of problems that can be solved with bounded error deutach polynomial time on a probabilistic classical computer. Quantum computing Qubit physical vs. Rapid solutions of problems by quantum computation. The Deutsch—Jozsa Algorithm generalizes earlier work by David Deutsch, which provided a solution for the simple case.

Quantum Physics

More formally, it yields an oracle relative to which EQPthe class of problems that can be solved exactly in polynomial time on a quantum computer, and P are different. At this point the last qubit may be ignored. Some but not all of these transformations involve a scratch qubit, so deutscu for one is always provided. Views Read Edit View history.


Applying the quantum oracle gives. It was one of first examples of a quantum algorithm, which is a class of jozssa designed for execution on Quantum computers and have the potential to be more efficient than conventional, classical, algorithms by taking advantage of the quantum superposition and entanglement principles.

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. Proceedings of the Royal Society of London A. The black box takes n bits x1, x2, Unlike Deutsch’s Algorithm, this algorithm required two function evaluations instead of only one.

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Deutsch–Jozsa algorithm – Wikipedia

Skip to main content. The algorithm is as follows. 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.

Further improvements to the Deutsch—Jozsa algorithm were made by Cleve et al. Read the Aogorithm v: The task apgorithm to determine whether f is constant or balanced.

In the Deutsch-Jozsa problem, we are given a black box quantum computer known as an oracle that implements some function f: Charge qubit Flux qubit Phase qubit Transmon.


The algorithm builds on an earlier work by David Deutsch which gave a similar algorithm for the special case when the function f x1 has one valued variable instead of n. References David Deutsch, Richard Jozsa. Nielsen and Isaac L.

This matrix is exponentially large, and thus even generating the program will take exponential time. In layman’s terms, it takes n-digit binary values as input and produces dejtsch a 0 or a 1 as output for each such value. It was one of the first known quantum algorithms that showed an exponential speedup, albeit against a deterministic non-probabilistic classical compuetwr, and with access to a blackbox function that can evaluate inputs to the chosen function.

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 agorithm as Deutsch—Jozsa algorithm in honour of the groundbreaking techniques they employed.

Unlike any deterministic classical algorithm, the Deutsch-Jozsa Algorithm can solve this problem with a single iteration, regardless of the input size.

Deutsch–Jozsa algorithm

Trapped ion quantum computer Optical lattice. The algorithm as Deutsch had originally proposed it was not, in fact, deterministic. The best case occurs where the function is balanced and the first two output values that happen to be selected are different.