Unanswered Questions
167 questions with no upvoted or accepted answers
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Question on a research paper for solving the Poisson equation using a variational quantum algorithm
I am reading a research paper: "Variational Quantum Algorithm Based on the Minimum Potential Energy for Solving the Poisson Equation". [ArXiV]
In the paper, the authors try to solve the ...
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How to get historical calibration data for mthree (M3) from IBM Quantum devices?
I'm using mthree in Batch mode. A batch needs to be queued before it can be executed. The time when a batch was executed can be obtained from the IBM Quantum Platform site, so I would like to obtain ...
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Reference recommendation for research in quantum algorithm and quantum machine learning?
I have finished reading Nielson and Chuang and am interested in doing research in quantum algorithm and quantum machine learning. Are there any references that introduce these topics at research level?...
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How to check if the diagonalizable circuit really diagonalizes the measurement observable?
For a Hamiltonian composed of a list of weighted Pauli strings, to calculate the expectation value, we need to obtain the expectation value of each Pauli string. To reduce the measurement overhead, ...
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Is gate optimization of superconducting qubits really a reinforcement learning problem?
There has in several scientific articles related to designing gates for superconducting qubits, been proposed to use reinforcement learning to design pulses with high fidelity and short duration.
Some ...
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RuntimeJobFailureError: 'Unable to retrieve job result. Error code 1520; The instruction cost per qubit exceeds the system limit
I want to find two operands of multiplication result of 180. In another word, finding integer factors of 180.
I'm using ...
glS♦
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Classification in QSVM 2014 model: understanding the quantum circuit
This is a QSVM circuit from this paper (fig.. 1-e). I am having hard time understanding after barrier 2(in blue line).
I get that before line one, HHL is used to find the hyper-plane parameters ...
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VarQITE from scratch: troubles understanding the Variational Quantum Time Evolution (VarQTE) algorithm from Qiskit
At the moment I am trying to implement variational imaginary time evolution in Pennylane from scratch. To get a feeling if it works, I compare the results of my own implementation with the solutions ...
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Understanding sources of error in 4-bit Grover's search on IBM QC
This question is similar to some others I've come across, related to why a 4-qubit implementation of Grover's search yields such poor results when run on the IBM QC compared to the 3-qubit case (...
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Does anyone have an idea about the execution power of IBM summit for VQE? I'd appreciate sources of papers as well for supercomputer execution
I'm trying to find the execution power of VQE in super computer and I want to know the factors of execution such as iterations, shots, convergence, etc. Please help me and also, I'd appreciate if ...
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motivation behind using PQCs in QML and Variational Algorithms
Parameterized quantum circuits (PQCs) are a key component in many quantum machine learning (QML) and variational quantum algorithms, such as the Variational Quantum Eigensolver (VQE) and quantum ...
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Run Qiskit Finance Tutorial on IBMQ backend
I tried to implement the qiskit example for portfolio optimization and it works as described. However I am not able to change the backend to one of the IBMQ machines - and it's not clear to me if this ...
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Error code 1217: "Session has been closed"
I am currently studying algorithms related to VQA. I have built a circuit to calculate the cost function and optimized it using a classical optimizer. During the initial optimization iterations, ...
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Performance of quantum annealing systems vs gate based ones
Quantum annealers like D-Wave can be used to solve Quadratic Unconstrained Binary Optimization (QUBO) which is a NP Hard problem (see here) while gate based quantum computers, like the ones created by ...
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Qiskit VQC - how does VQC associate the measurement results with labels?
I'm working through the example here, and am struggling to see at what stage it is specified how the measurement results/ or expectations collected from the circuit are used to decide which label to ...
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