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. As of August 2020, there are 20 processors on the IBM Q Experience ranging from 5 to 53-qubits. Note: Some systems are only available to hubs, partners, and members of the IBM Q network.

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Understanding the heavy output problem

In this paper (or more pedagogically here) it is given a way to compute the Quantum Volume of a quantum computer (qc), specifically aimed at the IBM qcs. In all this process I found some dark spots ...
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What is the actual precision of the IBM quantum computer?

In working with the IBM quantum computer, one can use for example the composer in order to build simple quantum algorithms. Essentially, one usually feeds a phase in order to affect one of the qubits. ...
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Cannot Repeat HHL Result

There is an HHL example in IBM Qiskit https://qiskit.org/textbook/ch-applications/hhl_tutorial.html If I run on that website (click "Try") in Section 4 and set ...
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Can I use Quantum lab during IBM Quantum certification exam? [closed]

Hello I am about to take the IBM Quantum Qiskit dev exam. I don't know if I can use the quantum lab (Qiskit) during the exam. Does anyone know?
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Why is a 15-qubit IBM quantum computer not working correctly?

I just wanted to implement an algorithm for adding two 2-bit binary numbers. And it works, but only on an IBM 32-qubit simulator. And on a real 15-qubit computer, ibmq_16_melbourne, it produces very ...
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Recover backend information in working remotely with the IBM-QC

I'm reading the details of qiskit following this paper (I know it's a little bit dated, but some things shown there should be in principle still accessible). For ...
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Characteristics of the IBM quantum computer

On the IBM Quantum Composer website, there are characteristics of qubit computers. For example, ibmq_16_melbourne. But there is no description anywhere of what: ...
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Adding team to our IBM Quantum Experience account

I have an account and API token on IBM Quantum Experience (https://quantum-computing.ibm.com/) I would like to add team members to the account, so that everyone can use it without sharing login ...
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IBM Quantum: 20 minutes for 1 shot, timeout for 2 shots. Why? [closed]

It takes 20 minutes for the ibmq_qasm_simulator to execute 1 shot of my circuit. Successful always. It always times out for 2 shots of the same circuit on the same simulator. One may assume the ...
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I can't see the results of my of my jobs

New user here. I tried to run a test circuit which I submitted to ibmq_santiago to run, but now I cannot see my results. No histogram, no circuit, only the status timeline. I believe the problem is ...
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How to upload our dataset using pytorch when it is not present in torchvision?

I am trying to upload my dataset(SWELL-KW) instead of MNIST in "Hybrid quantum-classical Neural Networks with PyTorch and Qiskit" provided by IBM qiskit but it says ...
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What is the largest number factored by the IBM Quantum simulators?

Though a lot of papers talk about the largest factored number by Shor's Algorithm, I want to know the largest one factored by the IBM Quantum, for example, the simulator_mps. I am able to use it to ...
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Bloch Sphere of Qiskit logo

Trying to plot the Bloch Sphere of the IBM Qiskit logo ...
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What is the minimal delay between gates on IBM devices?

Suppose I create the very simple circuit OPENQASM 2.0; include "qelib1.inc"; qreg q[1]; x q[0]; barrier q[0]; x q[0]; and submit it to an IBM backend. ...
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IBM Quantum “Jobs” web page problem: “Tags” always missing

I tried to edit the tags and saved them, but the "Jobs" page displays empty tags always. Is that a bug? Did I do it incorrectly?
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Please help interpret the IBM Quantum error code: “Instruction bfunc is not supported [7001]”

I have already run the circuit on the IBM Quantum simulators successfully. But, when I ran the same circuit on the real quantum device ibmq_16_melbourne, I got the error. The IBM website does have the ...
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In the job tab, no histogram appears

(Newbie here) Accessing IBM Q Experience on a Windows 7 operating system and using the Google Chorme browser. I can completely assemble my circuit, using the IBM Quantum Composer and when executing it ...
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How to read a Q sphere representation?

I'm trying to understand the Q-sphere representation of a 3-qubit system. I get that the 3-qubits are in a superposition of 2 different states. The first qubit (rightmost) is in a superposition of <...
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Uploading 20,000 lines of code to IBM Quantum Composer stalls

It is a simple 5 bit circuit, but it has 20,000 lines of QASM code. I try to put it in the composer, but the "Saving..." beside the file name will stay there for hours. I never saw its ...
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IBM Quantum Experience complains “Circuit needs at least one measure.” But, the circuit does have one!

I want to run this simple test on the IBM quantum computer ibmq_lima, but it complains about the measurement. As you can see, there is one "measure". The weird part is that it works if I ...
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Error 400 on submission request on job that ran before

since today in the morning I am always getting the following error while running a job on IBM Sydney "'Error submitting job: '400 Client Error: Bad Request for url: https://api-qcon.quantum-...
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How do I get the names of all currently available IBMQ devices?

How do I get the names of all currently available IBMQ devices?
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1answer
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Running Qiskit Circuit Composer locally on Jupyer Notebook

I was wondering if I could use Qiskit locally on Jupyter Notebook and thus loaded my IBM-Q account via API token. I could construct circuits execute jobs but when I tried to use circuit composer, it ...
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How to initialize a qubit with a custom state in Qiskit Composer

I'm trying to initialize a qubit with a custom state in IBM's Qiskit Composer. I wrote the code in the Qiskit Lab and obtained the QASM code as shown below ...
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Is there a physical definition of barrier operation in qiskit?

As far as I know, we can use barrier method in qiskit to split circuits into two sets to prevent the optimization. However, is there any physical meaning of the barrier? Like a delay operation or ...
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1answer
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Memory Requirements for Qiskit Aer Simulator

I'm trying to work out how much memory is used for simulations of different sizes using the Aer simulator. Here are my calculations: $$ \text{Number of Qubits} = n $$ $$ \text{Number of Amplitudes} = ...
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On the IBM-Q experience, how do different frequencies for different qubits affect results?

I've been looking at the graphs of various Quantum Processors on IBM-Q experience and for qubits, frequency of different qubits is the first statistic shown. From this in the Qiskit textbook: The ...
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How to create a unitary gate using normalized complex numbers in qiskit?

If I have a normalized $(\alpha,\beta)$ as $(0.24506+0.9633i,0.0046238+0.10943i)$ for a qubit $\left| \psi \right> = (\alpha_1 + i\alpha_2 ) \left|0\right> + (\beta_1 + i\beta_2 )\left|1\right&...
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How to do a POVM measurement of a quantum state in IBM's Quantum Composer?

I'm new to IBM, so I'm still figuring things out. I want to make a POVM measurement of a quantum state for state discrimination purposes. In other words I want a measurement that has three outcomes: A:...
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Process 3 MB of data in IBM

How can I process a 3 MB csv file in IBMQ? The memory shows 433 MB. Is this the maximum file size that I can upload and process in IBMQ?
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Does IBM have a publicly available tutorial on applied quantum computing and how does one use it? Any Reviews of the Tutorial?

I found this link and I am wondering if anyone has used it to learn or develop applications? I would like to know if people find it worth the time. I am reading the material by the way. https://...
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How do we implement QKNN algorithm on our dataset

What could be the steps to implement a distance based classifier (eg Qknn) on our dataset using quantum computing? I read a paper on "Distance based classifier using Iris dataset". I wanted ...
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1answer
68 views

How to make a half adder for x number of qubits with min. cost?

How to make a half adder for N inputs and getting the output on another x+1 output. Where x ...
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3answers
67 views

Is it possible to see the probabilities values of qubit ( alpha and beta) while measuring on IBM Quantum experience?

Is it possible to see what are the values of $\alpha$ (probability of being in state zero) and $\beta$ (probability of being in state one) while running on IBM Quantum simulator (we can call it state ...
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1answer
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How do I Initiate with my own alpha and beta values instead of starting form qubit in state zero in IBM Q?

Let's say I have normalized values of $\alpha$ and $\beta$ as $\alpha =(0.27524094128159016+0.8257228238447705j)$ $\beta =(-0.22019275302527214+0.4403855060505443j)$ How do I initialize my circuit ...
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2answers
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Multiple Providers on IBMQ

I am attempting to run parallel computations on two different backends from within the same Jupyter notebook, though it appears these two jobs are running sequentially. I understand the jobs will be ...
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Transpiler fails after 1000 iterations

I'm transpiling a set of quantum circuits using ibmq_5_yorktown. However, as the number of circuits gets larger, it shows me the following error message: ...
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IBMQ - Total samples exceeds the maximum number of samples for channel [8002]

I'm trying to run some pulse schedules on ibmq_bogota but I'm running into this error: There are 99 "circuits"/pulse schedules in this job. When I try to ...
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1answer
51 views

Handle Qiskit Excpetion while Loading IBMQ Account using Streamlit

I'm trying to build a simple web app for generating random numbers using IBMQ (Qiskit) and Streamlit. However, if there is no IBMQ saved account it should wait for the user to enter the API token and ...
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1answer
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Is there a 'retry' logic in job manager?

This is a follow-up question to my earlier post. I'm trying to filter a set of results obtained from job manager, and the following code works when my circuit list doesn't contain too many elements: <...
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1answer
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API error when trying to access IBM Quantum Computer using IBMQ API Token

I'm trying to write a code so that if the token exists then it loads the account or else it asks the user for the API token. Below is the code for reference: ...
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1answer
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CERTIFICATE_VERIFY_FAILED after updating Python when trying to access results in IBM QE

I had a question earlier about the Numpy DeprecationWarning flooding issue. I just updated the Python in my regular jupyter notebook and have trouble running the following cell: ...
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1answer
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Numpy DeprecationWarning flooding in IBM Quantum Lab

I'm coding using the Jupyter Notebook in the IBM Quantum Lab. However, I don't know why I see the following repeated message every time when I execute a quantum circuit: This message shows thousands ...
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45 views

IBM QE - Parameters that differentiate the various backends

I'm doing a university thesis using IBM's quantum backends. In my analysis I am making some considerations on what differentiates one backend from another other than the number of qubits and quantum ...
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1answer
35 views

Is it possible to modify pulse schedules in QASM?

Is it possible to modify a pulse schedule of a circuit compiled using QASM? I know this is possible using OpenPulse, but it seems none of the IBM backends support OpenPulse. So is it possible to do ...
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3answers
404 views

Why can I not apply a control gate/function to a gate like T, S, S dagger, … (using IBM Quantum Experience)? Is there another option?

I am trying to use the circuit composer of the IBM QE. I am doing the inverse QFT on 3 qubits and therefore need a control on T and S dagger gates, but it won't let me. Does anyone know why or know a ...
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How to create the state $\vert 0 \rangle+i \vert 1 \rangle$ using elementary gates?

I am trying to write $|0\rangle+i|1\rangle$ in terms of elementary gates like H, CNOT, Pauli Y, using the IBM QE circuit composer. I was thinking some kind of combination of H and Y since $Y|0\rangle=...
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Measurement of any qubit state in Y-basis [duplicate]

how can I measure any qubit state in Y-basis in qiskit. there is this solution here How to measure in another basis but it gives the qubit's position on bloch sphere in z-axis where as I think it ...
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1answer
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Can I access device specifications of IBMQ paying devices?

I need to perform some tests for my thesis in real quantum computers, however, I only have access to IBM's free quantum devices (the maximum number of qubits I can use is 15, in ...
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1answer
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How to deal with job submission error in IBM? [closed]

I keep on getting this error no matter how many circuits I run in the backend 'ibmq_athens'. It says 'Max retries exceeded with URL'. Can someone explain why I am getting this error message. The main ...

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