rrtucci
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Shortest sequence of universal quantum gates that correspond to a given unitary
Accepted answer
10 votes

Getting an optimal decomposition is definitely an open problem. (And, of course, the decomposition is intractable, $\exp(n)$ gates for large $n$.) A "simpler" question you might ask first is what is ...

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Why can the Discrete Fourier Transform be implemented efficiently as a quantum circuit?
3 votes

One of many possible constructions that gives some insight into this question, at least to me, is as follows. Using the CSD (cosine-sine decomposition), you can expand any unitary operator into a ...

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What are some good quantum computing simulator and visualiser?
Accepted answer
3 votes

I will tell you what my software Qubiter (GitHub page) does. Others like IBM (QISKit GitHub page, website and documentation), Google (Cirq GitHub page and documentation), Rigetti (PyQuil GitHub page ...

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What is a qubit?
3 votes

A qubit (quantum bit) is a quantum system that can be fully described by ("lives in") a 2-dimensional complex vector space. However, much more than that is required to do computations. There needs ...

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Is there a tool that can give you the unitary representing a quantum circuit from just a string?
2 votes

Normally, quantum simulators ask you to specify a starting state, for example, all qubits initially in state $|0\rangle$, and then they give you the final state after that initial state evolves ...

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What are the possible ways to visualise large, entangled states?
2 votes

My personal view: Yes, large entangled states can be visualized using quantum bayesian networks. See Factorization of Quantum Density Matrices According to Bayesian and Markov Networks, by Robert R. ...

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