10 results found for: “quantum_computer”.

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Quantum computing

quantum computations are known as quantum computers.: I-5  Though current quantum computers are too small to outperform usual (classical) computers for...

Last Update: 2022-06-30T01:25:14Z Word Count : 10224

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Topological quantum computer

A topological quantum computer is a theoretical quantum computer proposed by Russian-American physicist Alexei Kitaev in 1997. It employs two-dimensional...

Last Update: 2022-06-19T12:11:45Z Word Count : 2465

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Timeline of quantum computing and communication

which showed the computational infeasibility of simulating quantum systems on classical computers, due to the superposition principle. Polish mathematical...

Last Update: 2022-06-30T03:26:20Z Word Count : 16349

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Quantum algorithm

performed on a quantum computer,: 126  the term quantum algorithm is usually used for those algorithms which seem inherently quantum, or use some essential...

Last Update: 2022-06-07T07:12:50Z Word Count : 4355

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Trapped ion quantum computer

A trapped ion quantum computer is one proposed approach to a large-scale quantum computer. Ions, or charged atomic particles, can be confined and suspended...

Last Update: 2022-05-12T17:10:09Z Word Count : 3501

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Quantum information science

remarkable progress in manufacturing quantum computers, with companies like Google and IBM investing heavily in quantum computer hardware research. Today, it...

Last Update: 2022-06-02T00:46:46Z Word Count : 646

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Quantum information

computational term. It is an interdisciplinary field that involves quantum mechanics, computer science, information theory, philosophy and cryptography among...

Last Update: 2022-06-16T07:58:14Z Word Count : 4457

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Post-quantum cryptography

that are thought to be secure against a cryptanalytic attack by a quantum computer. The problem with currently popular algorithms is that their security...

Last Update: 2022-06-20T01:10:16Z Word Count : 4880

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Jiuzhang (quantum computer)

Jiuzhang is the first photonic quantum computer to attain quantum supremacy. Previously quantum supremacy has been achieved only once in 2019 by Google’s...

Last Update: 2022-05-29T00:41:07Z Word Count : 216

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Quantum Turing machine

A quantum Turing machine (QTM) or universal quantum computer is an abstract machine used to model the effects of a quantum computer. It provides a simple...

Last Update: 2022-06-20T17:36:29Z Word Count : 1078

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Main result

Quantum computing

Quantum computing is a type of computation that harnesses the collective properties of quantum states, such as superposition, interference, and entanglement, to perform calculations. The devices that perform quantum computations are known as quantum computers.: I-5  Though current quantum computers are too small to outperform usual (classical) computers for practical applications, they are believed to be capable of solving certain computational problems, such as integer factorization (which underlies RSA encryption), substantially faster than classical computers. The study of quantum computing is a subfield of quantum information science. There are several types of quantum computers (also known as quantum computing systems), including the quantum circuit model, quantum Turing machine, adiabatic quantum computer, one-way quantum computer, and various quantum cellular automata. The most widely used model is the quantum circuit, based on the quantum bit, or "qubit", which is somewhat analogous to the bit in classical computation. A qubit can be in a 1 or 0 quantum state, or in a superposition of the 1 and 0 states. When it is measured, however, it is always 0 or 1; the probability of either outcome depends on the qubit's quantum state immediately prior to measurement. Efforts towards building a physical quantum computer focus on technologies such as transmons, ion traps and topological quantum computers, which aim to create high-quality qubits.: 2–13  These qubits may be designed differently, depending on the full quantum computer's computing model, as to whether quantum logic gates, quantum annealing, or adiabatic quantum computation are employed. There are currently a number of significant obstacles to constructing useful quantum computers. It is particularly difficult to maintain qubits' quantum states, as they suffer from quantum decoherence and state fidelity. Quantum computers therefore require error correction.Any computational problem that can be solved by a classical computer can also be solved by a quantum computer. Conversely, any problem that can be solved by a quantum computer can also be solved by a classical computer, at least in principle given enough time. In other words, quantum computers obey the Church–Turing thesis. This means that while quantum computers provide no additional advantages over classical computers in terms of computability, quantum algorithms for certain problems have significantly lower time complexities than corresponding known classical algorithms. Notably, quantum computers are believed to be able to quickly solve certain problems that no classical computer could solve in any feasible amount of time—a feat known as "quantum supremacy." The study of the computational complexity of problems with respect to quantum computers is known as quantum complexity theory.


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