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Built with ❤️ by the quantum computing community

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    Quantum Algorithms

    20 algorithms found

    Bernstein-Vazirani algorithm

    The Bernstein-Vazirani algorithm is a quantum algorithm that efficiently determines a secret string of bits encoded within a function, using only a single query, which is exponentially faster than any classical algorithm.

    Determination

    Deutsch-Jozsa Algorithm

    The Deutsch-Jozsa algorithm solves the problem of determining if a black-box function is constant or balanced in a single query, offering an exponential speedup compared to classical deterministic approaches.

    Determination

    Grover's Algorithm

    Grover's algorithm is a quantum search algorithm that finds a specific entry in an unsorted database in significantly fewer steps than classical algorithms.

    Search

    Harrow-Hassidim-Lloyd (HHL)

    The Harrow-Hassidim-Lloyd algorithm is designed to solve systems of linear equations, particularly when the matrices involved are large and sparse, potentially offering exponential speedups in specific applications.

    Solver

    Quantum Amplitude Amplification (QAA)

    Quantum Amplitude Amplification (QAA) amplifies the probability amplitude of a desired state, quadratically speeding up the search for solutions in problems where a classical algorithm would require a linear search.

    Amplification

    Quantum Annealing (QA)

    Quantum Annealing uses quantum tunneling to find optimal solutions by gradually evolving a quantum system. This method is especially effective for combinatorial optimization challenges.

    Annealing

    Quantum Approximate Optimization Algorithm (QAOA)

    A hybrid quantum-classical algorithm that iteratively applies parameterised quantum circuits and optimises the parameters using classical methods to find approximate solutions to combinatorial optimisation problems.

    Optimisation

    Quantum Boltzmann Machines

    Quantum versions of classical Boltzmann machines, designed to use quantum effects for potentially more efficient training and inference.

    Modeling

    Quantum Counting Algorithm (QCA)

    QCA efficiently counts solutions to search problems, providing a quadratic speedup over classical methods.

    Estimation

    Quantum Error Correction (QEC)

    Quantum Error Correction (QEC) techniques protect quantum information from errors like decoherence, essential for fault-tolerant quantum computing.

    Correction

    Quantum Fourier Transform (QFT)

    A fundamental building block in many significant quantum algorithms, enabling them to achieve computational speedups by efficiently manipulating quantum information in the frequency domain.

    cryptography
    signal processing
    financial modeling

    Quantum Gradient Descent (QGD)

    QGD uses quantum computing to accelerate gradient descent, potentially improving optimization and machine learning. It uses quantum properties for faster gradient calculations and parameter updates.

    Solving

    Quantum K-Means Clustering

    Quantum K-Means Clustering is the quantum counterpart of the classical K-Means algorithm, an unsupervised machine learning technique used to partition a dataset into a pre-defined number of 'K' clusters based on similarity.

    Evaluation

    Quantum Phase Estimation (QPE)

    A fundamental quantum algorithm designed to determine the phase associated with an eigenvalue of a given unitary operator when provided with its corresponding eigenvector.

    Estimation

    Quantum Principal Component Analysis (QPCA)

    The quantum analog of classical PCA, used to reduce dataset dimensionality by finding its most important features.

    Modeling

    Quantum Support Vector Machine (QSVM)

    Quantum version of the classical SVM algorithm, used for data classification by finding an optimal separating hyperplane. It employs quantum computation, particularly for kernel calculations, to potentially offer speedups or improved performance on complex, high-dimensional data.

    Classification

    Quantum Walk Algorithm

    Quantum Walks use quantum mechanics to create a superposition of possible paths, allowing simultaneous exploration of a graph. They can outperform classical random walks in tasks like search and navigation.

    Isomorphism

    Shor's Algorithm

    Shor's Algorithm is a quantum algorithm that efficiently finds the prime factors of large integers, a capability that could break many widely used public-key cryptography systems.

    Cryptanalysis

    Simon's Algorithm

    Simon's algorithm efficiently solves the hidden subgroup problem, demonstrating exponential speedup over classical methods by finding a hidden binary string pattern in a black-box function.

    Benchmarking

    Variational Quantum Eigensolver (VQE)

    A hybrid quantum-classical algorithm that finds optimal solutions for complex molecular and optimization problems.

    drug discovery
    materials science
    financial portfolio optimization