Questions tagged [ibm-q-experience]

Use this tag for questions about IBM's Quantum Service - Circuit Composer & Quantum Lab. DO NOT use this for questions about general Qiskit issues (use [qiskit] for that).

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Difference between qiskit SPSA optimize and minimize in runtime program

I use this tutorial with pennylane-qiskit.vqe_runtime_runner to familiarize myself with qiskit runtime using pennylane. Thereby, I wonder: What is the difference between qiskit.algorithms.optimizers....
1 vote
1 answer
85 views

Implementing Quantum Walks at IBM

a question about quantum walks, would this circuit be correct to start a quantum walk in a hypercube? I saw something about increment and decrement, but I didn't quite understand how they would work ...
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0 answers
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How to stretch duration of standard gates of an IBM Backend?

I want to stretch the duration of standard gates of an IBM backend to amplify noise (as proposed in one of the earliest implementations of zero noise extrapolation (ZNE) (https://arxiv.org/abs/1805....
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1 answer
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Qiskit library.gaussian() does not accept parametric expression

I'm trying to build a gaussian pulse in qiskit where I keep the amplitude as a parameter but for the followig code ...
1 vote
1 answer
421 views

Unable to retrieve result for Job Error during VQE simulation

I am attempting to run a VQE calculation on the 'ibmq_qasm_simulator'. The job is failing with a series of errors caused by: ...
4 votes
2 answers
298 views

Qiskit: simulate a circuit using a backend noise model

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1 vote
3 answers
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What is the maximum number of qubits to execute a circuit on real hardware with IBM Quantum Experience and Qiskit?

I can't find anything that says about this. I know that on some simulators there are a limit of 32 qubits (quasi simulator) or more. But on real hardware ?
0 votes
1 answer
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IBM Q jobs being cancelled without error or explanation?

While sometimes the jobs run without any problem, and in other cases there are errors that can tell how to troubleshoot, in this case it seems there is no explanation from IBM. Has anyone had similar ...
11 votes
3 answers
4k views

How to quickly calculate the custom U3 gate parameters $\theta, \phi$ and $\lambda$ for any unitary?

In IBM Qiskit and Quantum Experience, the custom U3 gate is defined as $$ U(\theta, \phi, \lambda) = \begin{pmatrix} \cos\left(\frac{\theta}{2}\right) & -e^{...
-1 votes
1 answer
29 views

how to fix module not find error

how to fix 'module not find error' ModuleNotFoundError Traceback (most recent call last) Input In [4], in <cell line: 1>() ----> 1 import ...
1 vote
1 answer
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Design Digital logic circuit in IBM quantum lab

This is my first question here. I've started doing research in quantum computing. In Digital Logic circuits, there are many circuits (like parity generator, checker, demux etc.) that can be ...
0 votes
2 answers
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Why after breaking the entanglement does the phase disk in the second qbit not match the result?

I am new in IBM composer quantum and I have a doubt. I have the next circuit After reinitializing q0 and reading it. (breaking entanglement) The phase disk for qubit q1 says that 100% is 0, but the ...
2 votes
1 answer
265 views

'Internal error. Error code 9999' when running job on IBMQ

I'm trying to run a series of circuits in a job and I keep getting this error message which I haven't been able to find the meaning of anywhere in qiskit's documentation, online, etc. The job appears ...
2 votes
1 answer
135 views

How can I get IBM's API token?

I need an API token to use IBM's real hardware(greater than 5 qubits) in Qiskit, where can I find the price?
3 votes
1 answer
120 views

How call from IBM Q Experience (Jupyter Notebook) cplex

I have the latest version of cplex (12.9) installed on my computer. I use it very well with Jupyter notebook, but in IBM Q Experience, I did not get way to call it. IBM Q Experience warns me that the ...
3 votes
1 answer
47 views

Qiskit Runtime: What are the units of job.result().time_taken? Seconds, milli-seconds, micro-seconds?

job = execute(qwalk_circuit, backend='ibmq_16_melbourne', shots=1000) results = job.result() time = job.result().time_taken What are the units of time? And where ...
1 vote
2 answers
160 views

Random accuracy using VQC and Iris dataset

Using the same seed (seed_simulator and seed_transpiler) I get different accuracy when running it several times. In Aqua library (from qiskit.aqua.algorithms import VQC) I solved it adding ...
1 vote
0 answers
23 views

Can a Quantum computer simulate classical hack and exploit in a network ? Also how would it be any different from the classical computer [closed]

I'm trying to write a realistic story around Quantum computing and was wondering how different a network exploit/hack would look if a Quantum computer was to hack into a private network, instead of ...
0 votes
1 answer
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This is a question about IBM quantum circuit used to generate the quantum cheque state

I'm learning about quantum cheque. And I read "Experimental realization of quantum cheque using a five-qubit quantum computer" which is written by Bikash K. Behera ,Anindita Banerjee and ...
0 votes
1 answer
196 views

Unable to instantiate provider for research account locally

When I run IBMQ.load_account(). I have the error information: ...
6 votes
1 answer
275 views

How can I run a VQE on one of IBMQ's Quantum Computers

I have implemented a VQE based on Qiskit's VQE function and want to run that on an actual quantum computer. My understanding was, that an IBMQ backend can be passed into the function as a Quantum ...
1 vote
2 answers
39 views

Qiskit: Can I run real experiments in QPUs with OOP structured code?

The question might be naive, but I'm hesitant to design my algorithm in a complex, Object-Oriented scheme (custom classes, objects etc.). My fear is that current frameworks (e.g. ibmq, qiskit-runtime) ...
3 votes
1 answer
40 views

How to extract per shots measurement result from ionq device using qiskit_braket_provider?

I'm running a circuit on ionq device using qiskit_braket_provider. I want to extract per shot measurement results. While running ...
3 votes
0 answers
32 views

Is there a tutorial for error mitigation in qiskit that does not use the deprecated ignis?

Working through the qiskit text I have come accross measurement error mitigation a few times (Measurement Error Mitigation, Lab 3: Quantum Measurment,...]. In the online textbook the coding indicates ...
2 votes
1 answer
146 views

Need mathematical Calculation of input(T1,T2,f) and output(Readout Error)

I would like to know about the mathematical relations among T1, T2, frequency, readout error, and single-qubit error? This screenshot is from the ibmq-16 Melbourne excel data file.
3 votes
1 answer
242 views

VQE jobs do not appear in queue

I am trying to calculate the ground state energy of some simple molecules using 'MolecularGroundStateEnergy' tools in qiskit. When I run the calculations for very small molecules (e.g. H2, HeH+) the ...
2 votes
0 answers
39 views

A path towards building quantum Computing graduation project for undergraduates

I need help. I'm a computer science student with a Data science major. I have a final graduation project this year. With that, I want to create a project in the Quantum computing field. I'm already ...
1 vote
0 answers
19 views

duality quantum computing simulation

I am a starter of this quantum mostly new to quantum computing but I wonder if there is any option of simulating duality quantum computing in qiskit or IBM q or any other alternative way? Duality ...
0 votes
1 answer
224 views

Decompose native gates using Qiskit framework [closed]

I've read the papers about quantum hardware. These papers [1] [2] mention that native gates of IBM quantum computer are $R_x(\pi/2), R_z(\lambda)\space and \space CR \space (Cross Resonance)$ My ...
1 vote
2 answers
103 views

How to apply gates based on a random decision on the IBM quantum computer?

I want to run a circuit on an IBM quantum computer, and this circuit involves gates that are either applied or not based on a (classical) random decision. As a minimal example, imagine a circuit with ...
1 vote
1 answer
96 views

Measuring the accuracy of a circuit output?

I have created a circuit and got the output which matches the truth table but, I'm not understanding the measuring the circuit output in terms of the probabilities, power or error. This is the circuit ...
1 vote
2 answers
350 views

How can I save IBM Quantum API token to local environment?

I have an IBM Quantum account. How can I save the IBM Quantum API token to local environment so that I can access services including real quantum systems, simulators and Qiskit Runtime programs on my ...
1 vote
1 answer
31 views

Where are the multi-qubit openpulse computers?

As the question says, I'm looking to run some pulse schedules on quantum computers. Right now, I'm really only able to find ibmq_armonk (from IBM) to be an openpulse computer that I am able to use. I'...
2 votes
1 answer
149 views

how can we save a model using qiskit_machine_learning?

How can we save a trained model using Qiskit Machine Learning library? I've built a VQC classification model and once finished, I'd like to save the different models to be loaded later. There is a <...
0 votes
0 answers
14 views

How to run PegasosQSVC on IBMQ backend

I'm trying to run a PegasosQSVC on one of the IBMQ Quantum computers though the code just throws errors once we reach the training phase ie: PegasosQSVC().fit ...
1 vote
1 answer
30 views

What is "time in system" for a given job and how to retrieve?

I noticed that there is "time in system" for each job. For example: I was wondering what does this mean? I am guessing this means the time of the first shot starts on the quantum devices ...
1 vote
1 answer
66 views

No backends assigned to my Account [closed]

When I open my account on IBM Quantum Experience, I am shown 9 backends that are assigned to me. But when I open any of my circuits, I get the error that "This account has no backends assigned&...
5 votes
3 answers
172 views

When will Qiskit Runtime be available to all users?

IBM's Qiskit Runtime was recently made available to a select group of users. Have they announced when it will be available to all users or when they might open it back up to a second round of new ...
1 vote
0 answers
26 views

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 ...
2 votes
1 answer
183 views

Long running time at job

I try to launch QSVM algorithm (from Qiskit example ) on all real quantum devices (that is IBM Q) and get running time 5-30 seconds on one job. But if I use ...
1 vote
1 answer
316 views

ERROR_RUNNING_JOB with 32 qubit circuit running on ibmq_qasm_simulator backend

I recently made a quantum circuit that uses 32 qubits and try to run it on IBM Q Experience qasm_simulator backend. But it always ends with ERROR_RUNNING_JOB. ...
0 votes
0 answers
39 views

Grover Adaptive Search in Qiskit - why ancilla qubit is not used?

I am trying to solve some QUBO tasks with Grover Adaptive Search ("GAS"). For testing purposes, I use a simple task with quadratic part $$ A = \begin{pmatrix}0 & -0.5 \\ -0.5 & 0\end{...
3 votes
1 answer
118 views

Why I am not getting approximate equiprobable states in the following circuit on IBM Q simulator?

I have the following circuit which consists of symmetric modules. I compiled the circuit in IBM Quantum experience backend - ibmq_qasm_simulator, 8192 shots. The result is not equiprobable. Why? Since ...
0 votes
1 answer
204 views

Comparing QSVM & Classic SVM on BigData. Quantum Supremacy

I work on comparing QSVM and Classic SVM (SKlearnSVM) with using Qiskit. I have to show quantum supremacy at 400000-500000 samples but I don't get good results. I have problem with long time training ...
0 votes
0 answers
20 views

How to monitor a qiskit neural network on IBM Cloud?

I know qiskit offers the job_monitor function. However it only allows monitoring a BaseJob, for instance the one outputted from ...
1 vote
2 answers
80 views

How to deterministically add two integers on a quantum computer

I am new to the Quantum Computer world. I understand the basics of Quantum mechanics and I have watched a few lectures on Quantum computers, Quantum gates and played a bit on IBM QC. As far as I ...
1 vote
2 answers
89 views

which device had the best Average coherence time?

These are the IBM backend overview, do: Avg.T1/T2: here stand for the Average decoherence time or coherence time?
1 vote
0 answers
34 views

How to send another job to a device before finishing the last job?

Is there any way to create a for loop that would send a few jobs to run on a quantum computer simultaneously? I tried: ...
0 votes
1 answer
62 views

How to get statevector of qubits after running quantum circuits on IBMQ real hardware to calculate the fidelity of all qubits individually?

Is it possible to get the statevector while running quantum circuits on IBMQ real hardware? If getting the statevector is not possible can I still calculate the fidelity of a qubit somehow?. What I ...
7 votes
4 answers
1k views

How are IBM's 127 qubits more potent than the 5760 qubits D-Wave - Advantage_system6.1?

Hi I'm a newbie in quantum computing recently I had a look at the AWS braket and I've seen they had a machine called D-Wave - Advantage_system6.1 that has 5760 qubits but when I googled the highest ...

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