All Questions
82 questions
1
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31
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In Qiskit, is it possible to simulate a Rabi oscillation at the Circuit level through NoiseModel?
With NoiseModel in Qiskit we can add damping terms, for example through thermal_relaxation_error. I'd like to know if there is a way to simulate Rabi oscillation at ...
1
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0
answers
68
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How to apply circuit cutting to MCX gates?
I am working on a quantum version of a fuzzy controller (https://ieeexplore.ieee.org/document/9869303). This inference engine is implemented with a quantum circuit composed of X and MCX gates as in ...
- 61
-3
votes
1
answer
53
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Error when tryng to import quantum aer noise
I have been trying to implement noise reducer in aer simulator in my code. This is the line of code for import:
...
0
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0
answers
27
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Error Mitigation in Dynamic Quantum Circuits: Alternatives to Dynamical Decoupling?
"I have a regular quantum circuit (i.e., not a dynamic one), let's call it qc. When I run it on a real quantum computer without using dynamical decoupling, the result is poor. However, when I ...
- 51
2
votes
1
answer
50
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How to estimate noisy expectation value in limit of infinite shots?
I suspect this is an obvious question, but it has proven surprisingly elusive!
Suppose I have a quantum circuit, as well as a pre-defined initial state. After performing this circuit, I evaluate an ...
1
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0
answers
21
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How to implement frequencies (drive,measuring) and temperature in a qiskit Noise Model?
Im trying to build a qiskit Noise Model but the NoiseModel() class does not admit temperature, frequencies or measuring time.
I thought about using the pulse ...
0
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1
answer
39
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Manualy setting 'id' operation error probability in GenericBackendV2 doesn't work
I am trying to alter the noise probability for 'id' operation in GenericBackendV2. This is my code:
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0
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2
answers
390
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How to perform noisy simulation of qiskit fake backends?
I have qiskit fake backends present in qiskit ibm runtime, If I run the circuit directly on the backend is it noisy simulation, or should I use qiskit Aersimulator and then perform noisy simulation ...
0
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2
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84
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Customed quantum channel definition with Qiskit
According to this manual, the noise models can be implemente to a specific set of gates given by the user.
However, is there a way to implement a noise source acting at a specified time, rather than ...
- 641
1
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1
answer
110
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Is this quantum circuit design more prone to noise?
I am designing a quantum circuit which uses one qubit as the control of many $\text{CSWAP}$ operations. And then, this qubit will be measured.
Will the result be more prone to noise since all the ...
- 231
1
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0
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46
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VQLS behaves badly under simulation with noise
I was studying VQLS in https://qiskit.org/textbook/ch-paper-implementations/vqls.html and since I could not understand the circuit created by the new Hadamard test (...
- 53
1
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0
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27
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How to model the IBM quantum errors?
I'm conducting a study of the quantum channel errors, and a question has arisen: Is it possible to model the errors of an IBM quantum computer with Kraus operators?
0
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1
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225
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Using Noise Model of a real hardware on qiskit simulators
I am trying to understand how to use the noise model of real hardware. Below is the part of the code I have written with the help of sample codes from these links:
qiskit.github.io/qiskit-aer/apidocs/...
- 513
0
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0
answers
209
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Qiskit Noisy simulator sample code or documentation
I have to run some quantum circuits on Noisy simulator of qiskit? I tried searching some noisy simulator of qiskit but could not find anything. It would be great if someone can direct me to a qiskit ...
- 513
1
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0
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46
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Completeness relation of kraus operators not satisfied in Fake backends
With the following code
...
- 513
2
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0
answers
153
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Improve accuracy of fake backends while remaining realistic
If I run the code
backend = FakeLima()
nm = NoiseModel.from_backend(backend)
print(nm.__dict__.keys())
I get the following output:
...
- 513
2
votes
0
answers
84
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Qiskit noisy FakeManila simulator + ZNE
I am trying to run a simple VQE calculation on H2 using FakeManila noise model and ZNE for error mitigation; see code below. The problem is that I can never reach not even close the ground electronic ...
1
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0
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341
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Is there a way to implement a noisy CNOT gate using CUGate in Qiskit
Wondering if there's a way to implement the noisy version of CNOT (or CX) gate via CUGate using qiskit library for a given fidelity p?
- 79
2
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0
answers
127
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Most efficient way to calculate an expectation value of a noisy model in Qiskit
I want to classically simulate quantum circuits with noise. This noise can be a custom one (noise.NoiseModel()) or a fake quantum computer (...
- 513
0
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1
answer
326
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How can one obtain all calibration data which is needed to plot error_map of the ibm backend from few month ago?
I want to plot the error map of an IBM Quantum backend from the calibration data I saved a month ago. The saved file just contain qubit properties and to plot error map I would need all information ...
- 27
0
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2
answers
125
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How can visualise the old error map of Ibm backend if one save the calibration data of the backend at that time?
I have the calibration data of an Ibm backend and now I want to plot the error map of the device at that specific time.
How can I do this?
- 27
1
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0
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61
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How to manipulate thermal relaxation noise in Qiskit model?
I am trying to experiment with various values of T1 and T2 parameters in thermal relaxation noise.
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- 199
0
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0
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39
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Impact of various kinds of noise on calculation of operator's expectation value
I am trying to calculate the expectation value of an operator Op on Qiskit's simulator with noise present. I am trying to study the impact of various kinds of ...
- 199
1
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0
answers
131
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What does adding depolarizing error on a Hadamard gate mean mathematically?
I have a quantum circuit as the following picture. Now I add the depolarizing error on the Hadamard gate using the following code in Qiskit.
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- 579
2
votes
1
answer
183
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Is it possible to get access to the old noise model from a few months ago for Ibmq backends?
I performed an experiment on a real Ibmq backend, and the results were satisfactory. I now require the simulation of that experiment. The simulation is not sufficiently consistent with the old ...
- 27
1
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0
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82
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Zero noise extrapolation for error mitigation: Meaning of rescaled density matrix, specifically when there is no local hamiltonian evolution
I have a few questions regarding dynamics rescaling for zero noise extrapolation. In the paper Error mitigation for short-depth quantum circuits, in equation (30), they write
We redefine $T \...
2
votes
1
answer
668
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How to get a noisy density matrix after partial measurements in Qiskit
I'm trying to study the effect of noise on a quantum system with partial measurements using Qiskit. Suppose I have $N + M$ qubits and I run a quantum circuit and measure $M$ of them. I want to know ...
- 315
3
votes
1
answer
2k
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Is it possible to use fake backends to run Qiskit Runtime primitives?
I have the following code to run an Estimator primitive by using Qiskit Runtime. It computes the expectation value $\langle O \rangle = \langle \psi | O | \psi \...
- 1,594
1
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0
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39
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noise and classical bits (measurements ) in qiskit
I am using qiskit and LocalNoisePass to add custom noise to the gates. But there is a problem when there are classical bits in the circuits. The localNoisePass give this error
...
- 111
1
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0
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152
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Why my noise model acts different on my VQE circuit compared to a simple circuit
I have created a noise model which uses depolarizing error and I add it using the add to all qubits quantum error command. I also use readout error and add that using the add to all qubits readoute ...
4
votes
1
answer
404
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How to import noise model from IBM qiskit real device?
I am trying to import the noise model of an IBM 'large' device. I don't have access to the devices with more than 7 qubits so it doesn't allow me to import the backend and then do
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- 55
4
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0
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191
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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
0
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2
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515
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What is an instruction when we `add_all_qubit_quantum_error`?
I'm trying to understand how the noise model works in Qiskit Aer noise simulator. From this information page, add_all_qubit_quantum_error() has two required ...
- 361
1
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1
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36
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Creating a plot of groundstate energy (for a set distance) against noise
I am trying to create a plot of groundstate energy against noise like mentioned in the title.
I do this in the aim of finding some sort of correlation between the two meaning I can find what the ...
0
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0
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74
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Adding controllable noise to VQE to find ground state energy
I am wanting to add noise to my code which uses VQE to find ground state energy for LiH at various inter atomic distances. The code I am wanting to add to is the code found from the qiskit text book. ...
4
votes
1
answer
752
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Building a realistic noise model in Qiskit
I am trying to build a realistic noise model in Qiskit for a quantum computer that might be available 2-3 few years from now on. I tried to start from an existing noise model generated from a fake ...
- 228
4
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0
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35
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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 ...
1
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0
answers
49
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Copying a reduced noise model from an IBM device
I need to use the noise model coming from a large IBM device. Nonetheless, I do not need to use the whole Noise Model. I only need the information of let's say qubits [10:15] and [20:25]. That would ...
4
votes
1
answer
1k
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How to calculate the average fidelity of Pauli error channel
This question is related to this and this.
I am working on Qiskit to design QEC schemes.
My model works with Pauli errors.
I would like to give to my Pauli error channel probabilities $p_x,p_y,p_z$ ...
- 2,058
0
votes
0
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212
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Adding Calibration Data For Noise Model
I am building a custom noise model using Qiskit's NoiseModel class. I want to incorporate full range of calibration data, say for 7 qubit machine. I am not sure how to incorporate calibration features ...
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2
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0
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380
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Does Qasm Simulator add noise by default?
I am wondering if Qiskit QasmSimulator adds noise by default or not. I am asking because I have 2 circuits:
circuit 1: computes cosine similarity between two vectors
circuit 2: computes cosine ...
- 105
1
vote
4
answers
566
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Does qiskit_ionq have the possibility of simulating quantum circuits with noise?
I'm using qiskit_ionq API for simulating quantum circuits on ionq devices. Currently, I'm using the ionq_simulator backend, but I think it performs noiseless ...
3
votes
1
answer
531
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Noise model correspondence to qiskit implementation for $CNOT$ gate
My question especially relates to the CNOT because I'd like to carefully understand how Qiskit simulate a CNOT model.
Specifically, from my understanding, two independent qubits are affected by a ...
- 2,058
3
votes
2
answers
515
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Readout Error in Qiskit: What is a reasonable model?
The Readout Error in Qiskit is described here: https://qiskit.org/documentation/stubs/qiskit.providers.aer.noise.ReadoutError.html
Although it is easy to obtain such an error for 1-qubit for IBMs ...
- 645
2
votes
1
answer
269
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Implementing Readout Error in my circuit seems to have no effect whatsoever
I am trying to perform a simulation using Qasm in order to see how the readout error actually affects my circuit. The circuit I am implementing is a trivial one, the three qubit one that implements ...
- 645
1
vote
1
answer
239
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Fail to add amplitude damping error to NoiseModel
I am reading a book named Learn Quantum Computing with Python and IBM Quantum Experience authored by Robert Loredo. When I tried to run the code on Chapter 11, I followed the instruction and wroted ...
- 11
0
votes
1
answer
113
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Error Model on id gate, is not giving any error
I am trying to play with NoiseModel of qiskit, and I noticed that error on id gate is not giving any error results, while error ...
- 1,502
3
votes
1
answer
194
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Bias in the results of superposition measurements on IBMQ Backends, qiskit
Dear people on this forum,
I was doing some research, and I created this circuit in qiskit
Please bear in mind that I am really new to this field, and I do not retain much knowledge yet. Therefore I ...
- 31
4
votes
1
answer
627
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Simulators vs Real Backends
I am using Qiskit to run some circuits and a question arises in my mind. I know that when we run in the simulators we are running in "ideal" environments. This means there is no noise that ...
- 41
0
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1
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263
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How to differientate the noise functions in qiskit?
In Qiskit, there are many different Quantum Error Functions.
From my understanding, pauli_error represents the error rate of $X, Y, Z$ independently, and ...
- 1,423