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Unanswered Questions

195 questions with no upvoted or accepted answers
7 votes
0 answers
209 views

What do "$i$-th basic network", "quantum multiplexers" and "quantum parallelism" mean in this context? How are they beneficial?

I have been reading the paper A quantum-implementable neural network model (Chen et al., 2017) for a few days now, but failed to understand how exactly their algorithm offers a speedup over the ...
6 votes
0 answers
278 views

Quantum State Tomography Implementation in IBMQ

I am working to understand quantum state tomography, specifically using the algorithm presented in PRL 108, 070502. This paper is referenced in IBMQ implementations of QST, both in old deprecated ...
6 votes
0 answers
253 views

Is VQA quicker than classical machine learning?

Variational Quantum Algorithm (VQA) is a kind of quantum algorithm corresponding to classical machine learning. Unlike the square speed up of Grover's algorithm, the circuit in VQA does not seem to ...
6 votes
0 answers
371 views

Calculating gradient of a gate using Parameter shift rule

I've been following this website to check out how parameter-shift works for calculation of gradients for backpropagation in Variational Quantum Machine Learning Circuits Most of it made makes sense ...
6 votes
0 answers
141 views

Bell State 11 not working for parity curve

I am currently writing a script to automate the creation of parity curves for a 2 qubit bell state and then calculate fidelity and proving entanglement from that (inspired by this paper). It was going ...
5 votes
0 answers
271 views

How to get the compiled circuits and measurements from a Qiskit Runtime job

I have not been able to find any way to retrieve the compiled circuits and the measurement counts used for a Qiskit Runtime job. This page describes the various error suppression mechanisms available. ...
5 votes
0 answers
662 views

Add noise_model when using 'ibmq_qasm_simulator' backend and provider.runtime.run() function

I am trying to test some qiskit code that employs readout-error mitigation using the ibmq_qasm_simulator backend and Qiskit Runtime. I am getting the backend as ...
5 votes
0 answers
113 views

What is the best way to use loop statements on a quantum computer?

I am interested in solving a time dependent linear partial differential equation of the form $Ax=b$ which, in classical computing, would amount to looping over solutions of $Ax=b$ where $b$ is updated ...
5 votes
0 answers
160 views

Results from looped experiments on IBM Q different than individual experiments

I'm experiencing an issue while using Qiskit where the counts from a job return vastly different values when ran in a loop or as an array of circuits as opposed to single experiments when run by ...
5 votes
0 answers
733 views

How to build a quantum circuit representing the Ising Model?

Can someone explain to me how to build a quantum circuit representing the Ising Model? I just want to understand how to represent the Ising Model for the purposes of quantum state label classification....
4 votes
0 answers
60 views

Evaluating expectation values of operators using StateVector and MPS in Qiskit 1.0

Assume one has a QuantumCircuit object and a list of SparsePauliOp. How do I calculate their expectation values using the MPS ...
4 votes
0 answers
59 views

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 ...
4 votes
0 answers
68 views

Failed to load program into HAL component

I'm getting this error message when I execute my qiskit code on one of the available quantum computers of IBM: ...
4 votes
0 answers
361 views

Implementing Shor's algorithm on IBM Quantum Composer

I'm trying to recreate from this paper in the IBM Quantum Composer. However, this circuit isn't enough understandable for me to do so. I have tried to recreate the above circuit in the composer as ...
4 votes
0 answers
86 views

Incorrect probabilities in IBMQ Mid-circuit measurements

I calculated the probabilities for two measurements using mid-circuit measurements feature in IBMQ by following circuit: ...

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