Unanswered Questions
594 questions with no upvoted or accepted answers
4
votes
0
answers
66
views
Performing Binary Operations on Classical Bits
I am trying to prepare the n-qubits GHZ state using LOCC on Qiskit. The implementation uses the result of some mid-circuit measurements for later operations. I am now using something like
...
- 41
4
votes
0
answers
192
views
Qiskit QAOA optimization does not work when setting simulation seed in AerSampler
I am using Qiskit's QAOA for optimization and I would like to extract the probabilities distribution obtained in the optimization loop when running the circuit with the optimal parameters set. To do ...
- 41
4
votes
0
answers
408
views
The error with Estimator primitive due to the qiskit version
The code that I follow is from this tutorial.
But there are some errors due to the version of qiskit on the Estimator primitive
...
- 5,969
4
votes
1
answer
128
views
HHL for the pseudoinverse in Qiskit
The HHL algorithm can be modified to compute the pseudoinverse of $A$ as is shown here and here. Is there anyway to do this in Qiskit without coding the entire thing manually?
CommunityBot
- 1
4
votes
0
answers
191
views
Apply a single-qubit channel between in between two circuits in Qiskit
Suppose, you have two parts of a circuit in Qiskit, qc1 and qc2 on any number of qubits such that the entire circuit is given by
...
- 959
4
votes
0
answers
33
views
Qiskit: efficient way to create bound circuits?
I am running an optimization problem whose objective function $F(a)$ requires measuring N variational circuits $V_i(a)$ at each evaluation.
So, roughly, I have created N parametric circuits and I do:
<...
- 361
4
votes
0
answers
283
views
Qiskit NoiseModel.from_backend gives wrong gate error
According to the Qiskit documentation, a gate error is simulated by a thermal relaxation channel followed by a depolarisation channel, where the parameter of the depolarisation channel is adjusted so ...
glS♦
- 26.9k
4
votes
0
answers
35
views
How does it work QasmSimulator with the option "density matrix"?
I am making some simulations on IBM Quantum Lab and as backend I tried to use QasmSimulator(method = "density_matrix") in order to simulate noise. I wanted to know how this method works in ...
4
votes
0
answers
50
views
Predator–prey theory
We have a project where we are supposed to simulate the predator–prey theory in qiskit. Can anyone help or suggest of any ways to start from somewhere because we are kinda lost.
- 11.8k
4
votes
0
answers
240
views
How to implement a gate that generate a uniform superposition of all permutation of element
I'm looking for a quantum circuit that permits generating a uniform superposition of all possible permutations for example if we have as input $|0123\rangle$ the output will be the uniform ...
- 2,438
4
votes
0
answers
95
views
Why does running a pulse schedule for Bell circuit give incorrect counts?
As part of another project I need to be able to run a custom pulse schedule for a bell ciruit and measure the counts. However I am having a problem where running the scheduled circuit is giving counts ...
- 41
4
votes
0
answers
99
views
What is the most efficient method to update the binary encoded values inside a quantum state?
We're implementing a QML algorithm in which we have to update the value stored inside a quantum state which is strictly unknown to us, by multiplying it with a real number classically stored with us. ...
- 91
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 ...
- 157
4
votes
1
answer
308
views
Does one measurement affect the following measurement errors in mid-circuit measurement?
Suppose I have a quantum circuit with a few measurements (say $N$) on a single qubit. Before all the measurements, I generated calibration circuits and the 2 by 2 calibration matrix for that qubit of ...
CommunityBot
- 1
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:
...
- 577