A tag is a keyword or label that categorizes your question with other, similar questions. Using the right tags makes it easier for others to find and answer your question.

For questions about QEM (Quantum Error Mitigation) which is different from Quantum Error Correction in that no extra qubits are used.
76 questions
Stabilizer states are quantum states that can be efficiently represented by some set of Pauli operators of which the state is a +1 eigenstate. Stabilizer states are used commonly in many areas of quan…
76 questions
For questions regarding (or related to) applications of quantum information theory in chemistry or applications of chemistry in quantum computing.
74 questions
For questions about the amplitude-amplitude algorithm. Do NOT use for general Grover's algorithm related question. Amplitude amplification is a technique in quantum computing which generalizes the ide…
73 questions
Quantum assembly language (QASM) called OpenQASM is used to implement experiments with low depth quantum circuits. OpenQASM represents universal physical circuits over the CNOT plus SU(2) basis with s…
71 questions
For questions related to positive-operator valued measures (POVMs), that is, sets of positive semi-definite operators summing to the identity matrix.
70 questions
For questions about quantum circuits having a small (polynomial) number of quantum gates; each gate is defined randomly. Random quantum circuits may be implementable shortly, and be used in noisy, in…
70 questions
In quantum mechanics, and especially quantum information and the study of open quantum systems, the trace distance T is a metric on the space of density matrices and gives a measure of the distinguish…
68 questions
A projection operator is one which when acts upon a quantum state (which is an element of a Hilbert space), "projects" it onto a subspace or onto another element of the same Hilbert space.
68 questions
For questions about code which makes some use of QuTiP (Quantum Toolbox in Python). It is an open-source software library for simulating the dynamics of closed and open quantum systems. Please don't u…
65 questions
It is the branch of physics and engineering concerned with the properties and transmission of photons. Use this tag for those questions about photonics which are relevant to quantum computing.
64 questions
Having to do with continuous distributions, which are 'uniform' in the sense of being invariant under some relevant symmetry. In the case of quantum information theory, this usually relates to unitari…
62 questions
Question about the Qiskit Runtime architecture that streamlines quantum computations. The service is designed to use classical compute resources to execute quantum circuits with more efficiency on qua…
62 questions
For questions about the phenomena related to correlations among distant observers. For example, this tag should be used for questions about Bell or CHSH inequalities, or for questions about quantum st…
60 questions
For questions asking about applications of quantum computers to solve practical problems.
59 questions
For questions on theoretical models of quantum computations. Such models may be realistically 'build' in real machines, but not necessarily.
53 questions
The process of rewriting a given input circuit to match the topology of a specific quantum device, and/or to optimize the circuit for execution on present-day noisy quantum systems.
53 questions
For questions on Bell test experiments or Bell's inequality experiments, including but not limited to the CHSH and CH74.
50 questions
Topological quantum computing is a theoretical quantum computing model that employs two-dimensional quasiparticles called anyons, whose world lines pass around one another to form braids in a three-di…
47 questions
For questions about the specific realization of quantum computing that uses photons as qubits. Examples of gates include the Fabry-Perot cavity or linear optical components like beamsplitters. Questio…
46 questions
For questions regarding the famous Simon's algorithm which solves Simon's problem exponentially faster than any deterministic or probabilistic classical algorithm, requiring exponentially less computa…
45 questions
For questions related to quantum computing and quantum information research.
45 questions
the distinguishability of quantum systems in different states, and the general process of extracting classical information from quantum systems
44 questions
For all questions regarding quantum process tomography or derivatives thereof (like gate-set tomography). In quantum process tomography, processes that are performed on qubits are characterized rather…
43 questions
Quantum walks are the quantum mechanical counterpart of classical random walks. This tag should be used for any question related to quantum walk models.
43 questions
For questions related to quantum cryptography protocol BB84.
42 questions
a procedure that outputs repeated examples of the same quantum system - particle or multiparticle system - in the same quantum state
42 questions
In physics, the no-cloning theorem states that it is impossible to create an identical copy of an arbitrary unknown quantum state. (Wikipedia)
40 questions
Graph-states are a class of quantum state that can be efficiently and uniquely represented by graphs. In the case of qubit graph states, each edge corresponds to a CZ operation applied between two qub…
39 questions
Continuous-variable quantum computing is a type of quantum computing that makes use of physical observables, like the strength of an electromagnetic field, whose numerical values belong to continuous …
39 questions
For questions related to the "Swap test": a quantum algorithm whose purpose is to quantify the distance between two given quantum states.
39 questions
A 54-qubit superconducting quantum processor by Google Quantum AI which is claimed to have been used to demonstrate quantum computational supremacy.
39 questions
A model for noise in quantum systems such as a decohering qubit that has particularly nice symmetry properties. The depolarizing channel is a “worst-case scenario” channel. It assumes that we just com…
38 questions
A branch of atomic, molecular, and optical physics dealing with how individual quanta of light, known as photons, interact with atoms and molecules. It includes the study of the particle-like properti…
38 questions
For questions related to Noisy Intermediate Scale Quantum (NISQ) computing. NISQ computers cannot be classically simulated in a reasonable time but are not advanced enough to also be error corrected.
37 questions
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