Find answers to your questions about Quantum Computing or help others by answering their Quantum Computing questions.
Coming more from a computer science background, I never really studied tensor products, covariant/contravariant tensors etc. So until now, I was seeing the "tensor product" operation mostly as (what appears...
Asked on 12/12/2020 by tobiasBora
2 answerIn Qiskit we can't use noise models in the 'state vector_simulator' or the 'unitary simulator', hence making it impossible to compute fidelity of the output of the noisy circuit...
Asked on 12/12/2020 by Pingal Pratyush Nath
1 answerIf we have a composite system over five qubits ($|psirangle = |arangle|brangle|crangle|drangle|erangle$), and I want to project into a specific subspace of the first three systems, I can build...
Asked on 12/11/2020 by Germ
2 answerLet $overline{p}$ be a probability distribution on ${1,....,d}$. Then let $rho = sum_ip_i|iranglelangle i| otimes rho_i$. How should I take the Von-Neumann entropy of $rho$? I...
Asked on 12/11/2020 by the mmmPodcast
1 answerWhat is the best way to handle parametric circuits in Qiskit? When I create a variational form like TwoLocal and then do var_form.parameters it returns a set but that is...
Asked on 12/09/2020 by Bidon
1 answerI have been trying to run a circuit on ibmq_16_melbourne. But the result shows ERROR_RUNNING_JOB. The run status says:'Circuit runtime is greater than the device repetition rate [8020]'. Here...
Asked on 12/09/2020 by Dhruvesh Asnani
1 answerI have been trying to implement a QAOA for solving a traveling salesman problem (TSP) using qulacs and python. However, even for 3 cities, the implementation fails. Within QAOA, we...
Asked on 12/08/2020 by ile2N
0 answerThe book by John Watrous, "The Theory of Quantum Information" is an exciting read for anyone wanting to research quantum information theory. The following question presumes some background covered in...
Asked on 12/08/2020 by K Gautam Shenoy
0 answerI'm trying to wrap my head around the expectation argument in Qiskit's VQE class, so to understand it I'm trying to create an ExpectationBase object to understand it better, but...
Asked on 12/08/2020
1 answerMy question is very related to Intuition about Knill-Laflamme QEC conditions but in the particular case of Stabilizer code. In Nielsen&Chuang, the theorem 10.8 on page 466 gives error-correction...
Asked on 12/08/2020
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