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# Questions tagged [matrix-representation]

For questions about matrix representations of quantum gates.

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### How to get parity check matrix from a circuit in stim

I am working on QECC and, differently from classical ECC where everything is generally described by the parity-check matrices, QECC generally involves the low-level description of the circuit instead, ...
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### What is the general unitary matrix for two- and three-qubit states?

As pointed out in the QisKit tutorial here, for one qubit there exists a general unitary (see the expression for it in the previous link). I wonder if there exists equally unambiguous expressions for ...
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### In general, what is feasible quantum computation?

I don't really understand what is feasible quantum computation, in my book (Lipton and Regan's Quantum Algorithms via Linear Algebra) they said that: A quantum computation $C$ on s qubits is feasible ...
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### How to implement the -I matrix using Pauli gates

I'm trying to build a quantum walk circuit. I have the C0 matrix as follows import numpy as np C0 = np.array([[-1, 0], [0, -1]]) As we can see, it's the (-)...
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### How to build the quantum circuit corresponding to a given unitary matrix?

I have the following matrix for a circular quantum walk ...
• 577
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### How to find the matrix representation of a given many-qubit Hamiltonian?

I have the following Hamiltonian H = - Z1Z2 - Z2Z3 - Z1Z3 - 6(Z1 + Z2 + Z3) Here, Z1, Z2, Z3 represent the Pauli-Z operators acting on qubits 1, 2, and 3, ...
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### How to get the Dirac representation of a general quantum gate?

writing a matrix from bra-ket notations is easier. Going back is like finding prime factors. How to get the bra-ket form of all basic quantum gates in their matrix form in general?