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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1answer
34 views

Qiskit logical to physical qubit mapping

I want to run a simulation using qasm with a realistic noise model from a backend, specifying a coupling_map as well as an ...
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1answer
49 views

Is there any way to obtain the number of qubits of a given backend in Qiskit?

I'm testing out a program in different IBMQ mock backends, and I want the program to use the maximum number of qubits in each case. Is there any function/method to extract the number of qubits of a ...
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1answer
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Is there a way to run “in the background” code sent to the IBM backends?

I use different qiskit backends to run my code. Since the maximum number of shots is $2^{13}$, sometimes I need to send the same code several times with a "different ticket". I am wondering ...
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2answers
224 views

Drawing the circuit in Qiskit - how to set same style as in Composer?

A quantum circuit can be visualized in Qiskit with circuit.draw. A drawing style can be set with parameter output which can have ...
2
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1answer
66 views

Why does running my circuit on Quantum Hardware produce such unexpected resultss?

I am using Jupyter Notebook with Qiskit. I have created a program that can add two 3-bit numbers together. When I simulate this program on a qasm_simulator it works as expected and I can add any two 3-...
2
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1answer
73 views

Why I am gettting this error when I try to open the Quantum Lab in the IBM Quantum experience?

I am using quantum labs in IBM Quantum Experience to my circuits. But from yesterday onwards (May-03-2021) this error message is being shown on my screen. Does anyone have any idea about this issue?
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0answers
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What is the relationship between the (sx) error rate listed in calibration and the angle/amplitude errors calculated using the fitter?

The IBM Quantum services website lists calibration statistics for their devices, including the (sx) error rate per qubit, which is listed as a single number. One can also manually calibrate a device ...
2
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1answer
35 views

Can I use the same qiskit account on two laptops?

I have two laptops with different accounts of Jupyter Notebook. I'm wondering can I use the same qiskit account (with the same token) on both laptops? I'm worried that if I run the token on my new ...
3
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1answer
65 views

Why does applying a Hadamard gate three times to $|0\rangle$ result in a tiny imaginary component in the $|1\rangle$ amplitude?

I'm using qiskit with the online IBM Quantum Lab and when I run the following code ...
0
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1answer
45 views

4Q Grover circuit working in simulator, however producing nonsense in actual quantum computer

I am a noob at quantum computing but I am certain the circuit is correct. I've tried increasing the number of shots, changing the quantum computer. I think it might be a problem with my ccccx gate? I ...
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3answers
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What is the difference between Bloch's sphere and IBM's Q-sphere?

I'm new to Quantum Computing and I've been trying to understand single-qubit operations, quantum phases etc through Bloch's Sphere visualization. However, in IBM's Circuit Simulator, they seem to be ...
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0answers
32 views

Understanding the heavy output problem [closed]

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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1answer
75 views

Cannot Repeat HHL Result [closed]

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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1answer
44 views

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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1answer
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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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1answer
28 views

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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2answers
934 views

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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0answers
40 views

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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0answers
41 views

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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1answer
39 views

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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1answer
59 views

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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1answer
63 views

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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1answer
94 views

Bloch Sphere of Qiskit logo

Trying to plot the Bloch Sphere of the IBM Qiskit logo ...
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2answers
40 views

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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0answers
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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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1answer
43 views

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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1answer
47 views

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 ...
3
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1answer
53 views

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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1answer
60 views

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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2answers
75 views

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 ...
2
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1answer
97 views

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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2answers
475 views

How do I get the names of all currently available IBMQ devices?

How do I get the names of all currently available IBMQ devices?
3
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1answer
77 views

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 ...
3
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2answers
236 views

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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1answer
78 views

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 ...
0
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1answer
82 views

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} = ...
3
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0answers
32 views

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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1answer
75 views

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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0answers
37 views

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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0answers
35 views

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?
2
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2answers
368 views

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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0answers
43 views

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 ...
3
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1answer
78 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 ...
2
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3answers
69 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 ...
3
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1answer
84 views

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
44 views

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 ...
2
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0answers
64 views

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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0answers
40 views

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
52 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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