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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2 votes
2 answers
172 views

Is there a way to use a fake backend for ibm_brisbane?

Is there a way to use a fake backend for ibm_brisbane? I tried this but it is giving me the error that the backend is not present: ...
2 votes
1 answer
114 views

What is the probability of measuring in the following circuit?

So given the circuit and $|\psi\rangle = \alpha|0\rangle + \beta|1\rangle$ above I would like to see what the probabilities of each possible measurement are. To do this I tried expanding the circuit ...
1 vote
1 answer
331 views

How to get running time for each circuit executed on IBM's quantum processors in one round?

I want to execute multiple circuits in one round on IBM's backends, especially the 16-qubit one, to save time. For instance, ...
3 votes
1 answer
217 views

How to re-execute failed jobs in qiskit?

When executing a batch of circuits using the IBMQJobManager and attempting to combine all the results of all jobs with combine_results I get the ...
0 votes
1 answer
27 views

Get the error of basis gates programmatically

I want to get the error rates of the basis gates of a backend. Is there a function that can achieve this functionality? For example, I want the error rates of the basis gates rx, cx of ibmq_mumbai ...
1 vote
1 answer
48 views

QiskitBackendNotFoundError: 'No backend matches the criteria'

I am struggling with the QiskitBackendNotFoundError: 'No backend matches the criteria' even though I am able to see the backends available to me. ...
2 votes
2 answers
134 views

How to verify teleportation was successful in this circuit?

In this circuit (link), q0 is Alice's qubit and q1, q2 are entangled qubits given to Alice ...
0 votes
1 answer
38 views

IBM quantum composer possible bug?(state amplitudes of quantum circuit)

I have this quantum circuit: and from the IBM quantum composer I get this state amplitudes: I wanted to flip the target qubit and keep only its pure state however this is not what I am getting.I am ...
1 vote
0 answers
33 views

Interleaved Randomized Benchmarking experiment with custom PassManager

I have a custom PassManager, which calibrates a few gates in the circuit in the transpiler pass. I want to conduct an Interleaved Randomized Benchmarking experiment ...
0 votes
1 answer
42 views

How the shots belonging to the same job are scheduled to run on IBM quantum devices?

How the shots belonging to the same job are scheduled to run on IBM quantum devices? Suppose my job has 1000 shots. Will all shots be executed in series, or is it possible they will be interleaved ...
1 vote
1 answer
899 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: ...
2 votes
1 answer
119 views

How to represent two gates addition on Qiskit composer. we can do tensor product and multiplication but how to do Addition

How to represent two gates addition on Qiskit composer we can do it in python code by using qiskit library but I would like to visually see how addition of two operators look like in composer. I am ...
2 votes
3 answers
2k 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 ...
4 votes
1 answer
75 views

Retrieving job result attributes in Qiskit

I am trying to optimize a Hamiltonian using QAOA in IBM Qiskit. I used the following 'minimize' function to get my result. (I am not including the whole code because it will get unnecessarily long). <...
1 vote
1 answer
79 views

Qiskit's measurement error mitigation from counts data only, in 2023

Months or years ago, in a remote part of the globe, someone accessed an IBM Quantum computer online to perform a real experiment. She saved the resulting measurement outcomes of the algorithm in csv ...
1 vote
1 answer
98 views

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 ...
2 votes
1 answer
834 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?
0 votes
1 answer
141 views

How to add Source and sink qubit in dag Circuit

i want DAGCircuit like this The Following is my Source code ...
3 votes
1 answer
145 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 ...
1 vote
2 answers
293 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

How to represent the gates and the quibit states in the 'Hello Quantum' iOS game in IBM Quantum Learning graphical simulator

The Hello Quantum ios game developed by IBM has the X, Z, H and CZ gates manipulating a 2 qubit array (im not sure if array is the right word?). I want to know how I can represent the qubit states in ...
0 votes
1 answer
112 views

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
221 views

Unable to instantiate provider for research account locally

When I run IBMQ.load_account(). I have the error information: ...
7 votes
1 answer
741 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 ...
3 votes
1 answer
345 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 ...
1 vote
1 answer
27 views

Is qiskit.pulse.SamplePulse deprecated?

I'm currently following along the book "Learn Quantum Computing with Python and IBM Quantum Experience" by Rodert Loredo and I am at chapter 8 - Generating pulse schedules on hardware. The ...
1 vote
2 answers
325 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 ...
2 votes
0 answers
32 views

Quantum Annealing on IBMQ using Qiskit-Pulse

Qiskit-Pulse is the analog level control SDK of IBMQ hardware. Is it possible to implement an adiabatic annealing protocol/algorithm on IBMQ hardware using Qiskit-Pulse? Not asking about QAOA, which I ...
0 votes
1 answer
42 views

Frequency of qubits in qiskit simulators

I am trying to study the effect of dynamical decoupling sequences (Hahn Echo and CPMG) using qiskit's qasm_simulator with an added noise model from ...
2 votes
1 answer
315 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 <...
7 votes
3 answers
2k 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 ...
1 vote
0 answers
43 views

PulseSchedule jobs not getting submitted on Pulse enabled machines on IBM Quantum

There was a recent migration, referring the below document: https://qiskit.org/ecosystem/ibm-provider/tutorials/Migration_Guide_from_qiskit-ibmq-provider.html Before this migration, I was using IBMQ ...
1 vote
0 answers
26 views

ZNE for mitigating errors in probability distribution results

Can ZNE be applied to mitigate errors for getting the probability distribution in the computational basis rather than mitigating errors for calculation of expectation values?
2 votes
1 answer
146 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 ...
1 vote
0 answers
44 views

In qubit phase tracking, does the phase $\delta$ have to be synchronized to the Larmor precession?

In many textbooks (e.g. LaPierre 2021 or Byrd 2022), when dealing with the physical implementation of quantum gates in spin qubits, Larmor precession is usually introduced first as a way to rotate the ...
1 vote
0 answers
29 views

Running Pulse Schedules with different resilience levels

Is there a way to run a Pulse schedule with different resilience levels? I was thinking about passing the resilience level values in the options of Sampler primitive, but when I tried to run, it says ...
-2 votes
3 answers
242 views

How can I get $|00\rangle |01\rangle |10\rangle |11\rangle$ entangled on IBMQ experience?

How can I get this situation entangled on IBMQ experience? $$|00\rangle:\\ |01\rangle:\\ |10\rangle:\\ |11\rangle: $$
0 votes
1 answer
61 views

Phase estimation of the Pauli-Y matrix

I'm trying to use the phase estimation algorithm to extract the eigen value for both eigen vectors of the Pauli-Y matrix using the ibm quantum experiance. So far I have this for the possitive state |+&...
2 votes
1 answer
32 views

Is it possible to do the transpilation with a priori retired devices?

Is it possible to do the transpilation with "any" device in qiskit? I would be interested in doing this with already retired devices.
3 votes
1 answer
165 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 ...
-3 votes
1 answer
128 views

How may I get more "credits" on my IBM Quantum Experience profile? [duplicate]

How can I have 150 or more credits? I mean I want to have '150/150 credits'.
1 vote
0 answers
55 views

An unexpected result of the Implementation of a finding minimum values algorithm using a qRAM

Motivated by the article Quantum algorithm for finding minimum values in a Quantum Random Access Memory, I'm training to implement a simplified version of the proposed algorithm. But the output isn't ...
0 votes
0 answers
41 views

Error: module 'rustworkx' has no attribute 'visit' when trying to execute a quantum circuit in a real quantum computer from IBM

I am trying to use a real quantum computer from IBM. I have the next code: ...
0 votes
1 answer
68 views

Are quantum simulation results more accurate than real IBMQ device results?

Getting two different results from simulation and rel IBMQ device. Which is more accurate?
5 votes
4 answers
3k 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 ...
1 vote
1 answer
64 views

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 ...
0 votes
1 answer
133 views

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 ...
0 votes
2 answers
90 views

Is there a matrix exponential $e^{iA}$ gate in IBM Quantum Experience?

Is there a gate that can perform the matrix exponential operation $$e^{iA}|\Psi\rangle$$ in IBM quantum experience API? What is the name and symbol for this type of gate (or some other gates that can ...
0 votes
0 answers
47 views

Quantum Crosstalk in gate scheduling with different gates

I am working on quantum crosstalk, specifically on CNOT and SWAP gate operations that lead to crosstalk. I have encountered works that decompose CNOT and SWAP with iSWAP and CZ gates. I would like to ...
0 votes
1 answer
205 views

Design a full adder to add two 4-bits integer and measuring on 4 quantum states

I am trying to implement a full adder with minimum of 8 qubits to add two 4 bit integers. Integer 1 will be added on q[0-3] while integer 2 will be added on q[4-7]. The output will be measured on q[0-...

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