All Questions
16
questions
1
vote
2
answers
94
views
Error while plotting the resulting distribution
I am using this code, as a test of my qiskit, but I am having errors on using the simulator
Building the circuit
We begin by importing Qiskit.
from qiskit import *
...
- 11
4
votes
1
answer
510
views
How the real IBM quantum computers apply arbitrary Rz(θ) gate rotation? [closed]
I want to ask the following questions:
(1) The basis gate set of IBM quantum computers is { Id, Rz(θ),√X, X, CNOT, reset}. Somebody said that IBM didn’t really apply Rz(θ) gate on the machine. The ...
- 95
4
votes
2
answers
247
views
Why aren’t repetition codes used to encode qubits in superposition states?
I just finished reading the section of the qiskit textbook on quantum error correction using repetition codes(https://qiskit.org/textbook/ch-quantum-hardware/error-correction-repetition-code.html) and ...
- 103
5
votes
1
answer
206
views
Where does the "correction" in quantum error correction occur, specifically when using repetition codes?
I'm reading the part of the qiskit textbook that deals with this (https://qiskit.org/textbook/ch-quantum-hardware/error-correction-repetition-code.html) and so far it seems as though they're just ...
- 103
2
votes
1
answer
137
views
QPE Circuit test on Quantum Computer ('ibmq_16_melbourne')
After several atempts, I cannot mitigate the error when running the code on a NISQ, via the qiskit library (more specifically on the 'ibmq_16_melbourne').
I've already mapped the connected qubits and ...
5
votes
3
answers
882
views
How to create the logical $|0_L\rangle$ state for the Steane's 7-qubit code?
I don't know how to prepare using Qiskit the following state in order to implement a Steane's 7-qubit code circuit (I omit the normalization factor):
\begin{align*} |0_L\rangle =&|0000000\rangle+|...
- 75
2
votes
1
answer
455
views
How to do error mitigation on the ibmq_16_melbourne?
I'm trying to make a calibration matrix using CompleteMeasFitter as in here on IBMQ Melbourne, but I need to use all 15 qubits, which mean it has to run 32768 calibration circuit, far exceeding the 75 ...
- 584
1
vote
1
answer
269
views
Quantum error correction on IBM devices?
I'm wondering if the gate errors on any of the IBM devices are low enough so that we could use some error correcting codes which do not require too many qubits? (such as 5- or 7-qubit codes). Even ...
- 1,981
2
votes
1
answer
484
views
Different results between qasm_simulator and quantum computer: how to normalize for only few states
I recently started developing circuits with Qiskit. I made a 5 qubit circuit in which the fourth qubit at the end of execution must always have value 1:
When I do the simulation with qasm everything ...
- 23
2
votes
1
answer
193
views
Different QFT results when using Simulator or Quantum Machine
I'm performing QFT using the following code:
...
- 143
2
votes
2
answers
656
views
Mitigating the noise in a quantum circuit
I'm using Qiskit and I have a Quantum Circuit (say, circuit) that gives reasonable results when using the simulator, namely
...
- 143
0
votes
1
answer
128
views
QISKit Connection
I ve beeen trying to use the qiskit package from spyder IDE inisde anaconda (Python version 3.7) but when i try to acces my account I get the following error:
...
1
vote
0
answers
519
views
Job execution issue while using IBMQ Experience
I am trying to run QSVM algorithm on the IBMQ backend devices using the API_TOKEN. Below is the snippet of the code that I am running. The code fails the validation test and throws an exception after ...
- 11
3
votes
1
answer
2k
views
How do I interpret the readout error for a quantum computer?
For example, the ibmqx2 computer has the most recent readout error of $4.40 \cdot 10^{-2}$. Does this mean per 1000 measurements, 44 faulty results exist?
- 183
8
votes
1
answer
526
views
How does measurement calibration work?
One of the possible ways to improve the results of an experiment on the IBM machine using the Qiskit language is to use the measurement calibration methods. This is the link to the documentation.
I ...
