Find answers to your questions about Quantum Computing or help others by answering their Quantum Computing questions.
I have two states $|{psi}rangle = begin{pmatrix} a_1\a_2 end{pmatrix}$ and $|{phi}rangle = begin{pmatrix} b_1 \ b_2 end{pmatrix} $ that I want to "add" together. By "add," I of...
Asked on 08/20/2021 by Visipi
1 answerSuppose I have an unknown state $|psirangle = sum_i alpha_i|{lambda_i}rangle$, is it possible that I can transform it into $|psirangle = frac{1}{sqrt{sum_i|alpha_i|^{2r}}} sum_i alpha_i^r|{lambda_i}rangle$? I have an...
Asked on 08/20/2021 by M. Chen
1 answerWe know that every CPTP map $Phi:mathcal Xtomathcal Y$ can be represented via an isometry $U:mathcal Xotimesmathcal Ztomathcal Yotimesmathcal Z$, as$$Phi(X) = operatorname{Tr}_{mathcal Z}[U(Xotimes E_{0,0})U^dagger],quadtext{where}quad E_{a,b}equiv...
Asked on 08/20/2021
1 answerI have a circuit with 2 ancilla bits. I have only asked that the circuit measure the 4 other qubits, but the results keep including the ancilla bits. How to...
Asked on 08/20/2021 by Requiem
1 answerIn David Deutsch's classic paper Quantum theory, the Church-Turing principle and the universal quantum computer (1985), Deutsch writes on p. 99:...
Asked on 08/20/2021
2 answerWhy we should use density matrices to simulate quantum systems with noise? I found that the any QEC circuit is included by some quantum gates just like normal cases, which...
Asked on 08/20/2021 by Henry_Fordham
2 answerSuppose I am solving the TSP formulated as a QUBO problem using QAOA. I understand from the original paper that there is a parameter $p$ which...
Asked on 08/20/2021
1 answerFix a finite number of states $sigma_k$, and consider a channel of the form$$Phi(X)=sum_k c_{k}(X)sigma_k.$$ For $Phi$ to be linear and trace-preserving we must have:...
Asked on 08/20/2021
1 answerAs the number of qubit increasing, the frequency of qubit will be crowded and there will become the frequency collision. I was wondering that is there any relation between frequency...
Asked on 08/20/2021 by peachnuts
0 answer"Quantum theory, the Church-Turing principle and the universal quantum computer" (Deutsch 1985b) appears to introduce the term of "quantum parallelism" (the term is not in "Quantum Theory as a Universal...
Asked on 08/20/2021 by vy32
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