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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114 views

How to download from IBM Quantum lab folder of data .txt files all at once?

I have a script in the IBM Quantum lab which runs several jobs and stores the result of each job as a .txt file in a results folder. All I want to do is to download the folder of files. I cannot ...
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1answer
67 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 <...
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1answer
28 views

Adding collaborator to project during reservation

If I add a collaborator to an IBM Quantum Education project during a system reservation, do they immediately get priority access to the reserved system? Or do I need to add them before the ...
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93 views

How to build and visualize circuit from matrix?

In paper Efficient quantum algorithm for solving travelling salesman problem: An IBM quantum experience, the authors use gate $U_j$ and its decomposition $$ U_j = \begin{pmatrix} \mathrm{e}^{ia} &...
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1answer
64 views

Trying to connect IBM Quantum to External API

Is it possible to connect a quantum computer to openlibary.org API? How do I find the public IP address to my quantum instance?
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How can I simulate the Avg CNOT Error on IBMQ Backends?

I want to know exactly how to estimate the Avg CNOT Error rate for IBMQ Backends? For instance, I tried to estimate the Avg CNOT Error rate for Belem Backend; I randomly prepared the 00,01,10,11 ...
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60 views

FileNotFoundError: No such file or directory. This error occurs while giving a data path to upload datafile(present on desktop) in IBMQ [closed]

I am trying to implement https://qiskit.org/textbook/ch-machine-learning/machine-learning-qiskit-pytorch.html#3.-Let's-code!- in IBMQ using a dataset present on my desktop. While uploading a dataset ...
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34 views

What is this pulse experiment showing?

The following results in the figure were achieved using Qiskit pulse by doing the following pulse sequence; { $\frac{\pi}{2}$, delay $\tau$, $\pi$, delay $\tau$, $\frac{\pi}{2}$} The figure is the ...
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Recover qubits used in an actual computation

How do I recover from a certain job_id in the IBM backends which qubits where used? I would be interested to know if for instance, in a batch of say 50 jobs, 25 of ...
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1answer
98 views

How to find the expectation value of several circuits using Qiskit aqua operator logic?

I am using the method from this SE answer to calculate the expectation value using qiskit aqua operator logic which works well for a single circuit. Here is a simplified code snippet to demonstrate ...
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1answer
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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 ...
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86 views

IF statement in OpenQASM2.0 on IBM Quantum Experience -- error

I have written the following toy .qasm file, which has some adaptive measurements: ...
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156 views

How do I identify a VQE job run in real hardware?

I am running a VQEUCCFactory for H2 on a real hardware device. ...
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123 views

Guide for Qiskit's Measurement Error Mitigation?

I'm reading about error correction mainly in the Qiskit Measurement error mitigation chapter contains what it seems and easy way to "clean up" the noise obtained in the IBM (or NISQ) devices....
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1answer
169 views

How do I send a quantum circuit to IBM for execution?

I have, let's say, the following quantum circuit: The QASM code of this quantum scheme has the following form: ...
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2answers
287 views

Apply readout error mitigation to mid-circuit measurement

I'm trying to construct a quantum circuit with 3 mid-circuit measurements, here's an example: ...
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1answer
77 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 ...
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2answers
392 views

How can I specify the qubits on quantum computers that I want to use?

Suppose I have the following 2-qubit quantum circuit: ...
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1answer
28 views

"us" units on relaxation times $T_j$ in the IBM backends

A pretty lame question but, the backends relaxation times $T_1,T_2$ are given in us units. What are those? (Frequencies are given in GHz... Is it really $\mu s$ but IBM can't display the $\mu$ in the ...
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1answer
100 views

$T_1/T_2$ thermal relaxation example

The built in noise models in Qiskit have an example of $T_1/2T_2$ relaxation here. I have a couple of doubts; the notebook is not very clear in some of the steps. Why does one need $T_2\leq 2T_1$? ...
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2answers
138 views

Qiskit Pulse Notebook

When I downloaded the source code from Qiskit Notebook Accessing Higher Energy States and tried to execute it, the output and graph seem wrong in the step finding the frequency step which leads to the ...
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1answer
94 views

IBM Quantum API for Java Developers

As far as I know, IBM Quantum provides two types of APIs: one for Qiskit, and the other for third-party uses (API for developers). In this question, there are several arguments about using the API for ...
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2answers
78 views

Data embedding using IBM quantum composer

How do you use the IBM quantum composer to encode some data $(a,b,c,d)$ represented by a vector ket in which $a,b,c,d$ have been normalized to one? $a|00\rangle + b|01\rangle + c|10\rangle + d|11\...
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issues running a 32 qubit grover's algorithm

I have a 32 qubit grover's algoritm however whenever I run it on the simulator that IBM offers it always ouputs a probability of 1 on every single result. Is there a way to run circuits larger then 32 ...
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1answer
65 views

Qiskit Portfolio Optimization : Does the resulting matrix show the stock combination to select?

The IBM Qiskit Portfolio Optimization sample finally provides an array similar to [1,0,1,1] representing the 4 digits as the stocks. So does the ...
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1answer
106 views

IBM quantum computer giving the wrong result?

This is the first time I am using the IBM quantum computer. I tried to run a circuit (see below the first picture) but the results I got don't match the theoretical results shown (see below the second ...
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1answer
51 views

Time result for my algorithm

I've used the function result.time_taken to know the amount of time used to execute a task on the real chip, but I don't understand if the result is in seconds or ...
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2answers
70 views

Who is responsible for implementing quantum error correction?

There are various options for error correction. For example, the Shore code or a whole class of surface codes. But I don't really understand at what level they should be implemented. For example, I ...
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1answer
51 views

How to import circuit libraries into qiskit

Im trying to put the QFT circuit in my qiskit circuit but im having trouble: ...
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58 views

How to simplify a circuit with repeated same parts?

If I have a circuit with 3 qubits and repeated gates as follow: ...
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1answer
119 views

Is RYY gate not available in IBM Quantum Composer?

If so, why? How to create the RYY-gate in the composer?
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1answer
148 views

Qiskit: Transpilation and the CircuitSampler

I am using Qiskit's opflow and its CircuitSampler to evaluate matrix elements / expectation values. Now, going beyond ...
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1answer
104 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
120 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
46 views

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
351 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 ...
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1answer
86 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-...
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1answer
107 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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1answer
43 views

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 ...
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1answer
52 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 ...
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2answers
127 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 ...
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1answer
57 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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4answers
518 views

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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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
98 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
97 views

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
35 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
1k 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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51 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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