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Quantum Computing Concepts
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Qubit
The basic unit of quantum information, representing a two-state quantum-mechanical system.
Superposition
A quantum property allowing a particle to be in a combination of all possible states simultaneously.
Entanglement
A quantum phenomenon where particles become interconnected and the state of one immediately influences the state of another, regardless of distance.
Quantum gate
A fundamental operation on qubits that changes their state and is the quantum equivalent of a classical logic gate.
Quantum circuit
A model for quantum computation representing a sequence of quantum gates and measurements applied to qubits.
Quantum entanglement
A physical phenomenon that occurs when pairs or groups of particles interact in ways such that the quantum state of each particle cannot be described independently of the others.
Quantum decoherence
The process by which a quantum system loses its quantum properties due to interaction with an external environment, resulting in a classical state.
Quantum tunneling
A quantum phenomenon where particles can cross barriers higher than their kinetic energy, impossible in classical physics.
Bell state
A specific quantum state of two qubits that are maximally entangled.
No-cloning theorem
A theorem stating that it's impossible to create an identical copy of an arbitrary unknown quantum state.
Quantum coherence
The ability of a quantum system to retain the phase relationships between its states, a crucial aspect for quantum computing.
Quantum error correction
A set of methods to protect quantum information against decoherence and other quantum noise.
Deutsch's algorithm
The first quantum algorithm that illustrates quantum computing's speed advantage for certain problems over classical methods.
Shor's algorithm
A quantum algorithm for integer factorization exponentially faster than the best-known classical algorithm.
Grover's algorithm
A quantum algorithm providing quadratic speedup for unstructured search problems.
Quantum simulation
Using a quantum computer to simulate complex quantum systems that are intractable for classical computers.
Quantum annealing
A method used to find the global minimum of a function by exploiting quantum tunneling.
Adiabatic quantum computation
A model of computation that operates by slowly varying the Hamiltonian of the quantum system.
Topological quantum computer
A theoretical quantum computer that uses topological states of matter to preserve quantum coherence and perform quantum computations.
Quantum supremacy
The point at which quantum computers perform computations that are unfeasible for classical computers in a reasonable time frame.
Quantum key distribution (QKD)
A secure communication method that uses quantum mechanics to encrypt and decrypt messages.
Quantum teleportation
A process by which the quantum state of a particle is transmitted exactly from one location to another with the help of classical communication and a previously shared quantum entanglement.
Quantum volume
A performance metric for quantum computers that measures the size and quality of entangled qubit states they can maintain.
Quantum Fourier transform (QFT)
The quantum analogue of the discrete Fourier transform, a part of many quantum algorithms.
Quantum machine learning
An emerging field that combines machine learning and quantum computing to potentially solve complex problems more efficiently.
Quantum-resistant cryptography
Cryptography methods designed to be secure against the potential threat posed by quantum computers.
Quantum algorithm
A step-by-step procedure, based on quantum mechanics principles, used for solving a problem on a quantum computer.
Bloch sphere
A geometrical representation of the pure state space of a two-level quantum mechanical system (qubit).
Quantum state
A mathematical entity that provides a probability distribution for the outcomes of each possible measurement on a system, described by a vector in a Hilbert space
Hadamard gate
A one-qubit quantum gate that transforms a qubit into an equal superposition of two states, if it starts from a basis state.
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