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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1answer
78 views

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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2answers
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1answer
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What's the point of a measurement operator? [duplicate]

I was experimenting with quantum circuits in IBM Quantum Experience. I know that the Hadamard gate creates superposition in the qubit, so I created the following circuit: However, when I looked at ...
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1answer
83 views

Braket and Q# Simulators

I have implemented Shor's algorithm in Qiskit, and everything works as expected within the IBM Q experience for both the IBM qasm_simulator and real hardware. However, after I've implemented Shors in ...
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3answers
272 views

Simple Hadamard Circuit gives incorrect results?

I am running the simplest Hadamard circuit possible - one qubit, initialised to 0, apply H gate, measure in Z basis. When I run the circuit on the simulator I obtain the expected result (50% in 0, 50% ...
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1answer
55 views

how to generate a random sequence [duplicate]

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1answer
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Qiskit issues with Apple Silicon?

Edit/summary: Everything below this first paragraph is my original question posted several days ago and involves a lot of speculating on a problem I knew less about at the time. The purpose of this ...
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2answers
54 views

I am uploading a CSV file but cannot access it in the notebook [closed]

I uploaded a CSV file using import in Quantum Computing Lab folder. It is uploaded, I can see it. When I write "import filename" in my notebook, it shows an error. I have tried doing the ...
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2answers
80 views
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1answer
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Increase maximum shots on IBM Hardware when running Quantum Variational Algorithms

I am interested to know whether there is a quick and elegant way of increasing the number of shots (more than 8192 shots) on IBM hardware when running variational algorithms like VQE or QAOA. I know ...
3
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1answer
53 views

Kernel stopping when solving water molecule ground state

I'm new to QISKIT Aqua and I'm trying to follow the Ground State tutorial to solve the Water molecule ground state, but when I execute the calculations the kernel stops. I'm using IBM Q Experience ...
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1answer
694 views

My IBM quantum account has been disabled

As shown in the picture above, my IBMQ account is unavailable, and I found that my friend's account is also unavailable, but I have not received any email or message notification. what happened?
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2answers
88 views

Output of Bell State Measurement

I was trying to see the output of Bell State Measurement in IBM Quantum Experience but in the simulation down the circuit in the histogram, it showed me that the possible qubit will be $|00\rangle$ ...
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2answers
108 views

IBM quantum experience: Why are intermediate measurements ignored?

Why am I getting here a measurement outcome of $00$? I measure after the first $X$ gate in a separate output bit c[1] which should result in a $1$ and I measure ...
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1answer
90 views

IBMQ qiskit SSL error submitting job [duplicate]

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1answer
57 views

Is Noise model for quantum prototypes accurate in Qiskit

We know that in Qiskit noise models modeling specific quantum machine prototypes exist and can be inserted into the code. However, are these models fixed in nature or they continuously improve ...
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1answer
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Two questions on circuit composer on IBM Q Experience [closed]

I have two (unrelated) questions when I run circuits on IBM Q Expierence. The first one is encountered, when I run the built-in function VQE (for H2 molecule). It seems two circuits were run, and the ...
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4answers
196 views

How to transpile a circuit using Qiskit as done in IBMQ experience

When I create a circuit using Qiskit and then transpile it using transpiled_circuit = transpile(circuit, ibm_backend, optimization_level=1) then I open my IBMQ ...
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3answers
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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? $$|00\rangle:\\ |01\rangle:\\ |10\rangle:\\ |11\rangle: $$
3
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1answer
229 views

How to run a OpenQASM 3.0 file?

When uploading a QASM-file with ÒPENQASM 3.0; as first line, the code editor on quantum-computing.ibm.com will throw an error. However the qiskit Python library ...
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1answer
49 views

Device Repitition Rate on Melbourne

I've been receiving "Circuit runtime is greater than the device repetition rate [8020]" errors when running a relatively simple circuit on ibmq_16_Melbourne, but have had no issues ...
3
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1answer
118 views

IBMQ: Can I implement a quantum measurement in the middle of a quantum circuit?

I am executing a quantum circuit on an IBM quantum device. The circuit is simple: A single qubit (start from $|0\rangle$), Rx($\pi/2$) Measure (in z) 3 .Rx($-\pi/2$) Measure (in z) The final ...
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1answer
120 views

How to measure a quantum circuit's execution time on a real IBM device?

I am executing a quantum circuit on an IBM quantum device and I need to start a timer as soon as the job in the queue starts running. I have already used: ...
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1answer
148 views

IBMQ: “Credentials are already in use”

Executing the following: ...
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1answer
116 views

Error while trying to execute the Quantum Circuits in IBMQ

I have been trying to execute the quantum circuit in the backend of the IBM 16 qubit Melbourne machine. I end up getting ...
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1answer
40 views

Where are my Results?

I've successfully used IBM Q Experience for quite a while now. But the interface seems to have changed. After I run a simulation on my quantum circuit, I go to Results but I don't see the answer in ...
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3answers
73 views

Measurement of 1 qubit in a two qubit system

I created two qubits in IBM quantum experience and measured the second qubit without applying any gate. The result I got had a computational basis of 00 and 10. How does the measurement of the second ...
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1answer
88 views

Recording the time taken by a VQE to find ground state energy

I want to record the time that a VQE solver takes to find the ground state. At the moment I am using: ...
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0answers
82 views

State bug in IBM Quantum Experience

I run many tests with VQC and QSVM algorithms. In last times I can't get final result because some job hang on state Creating, Validating or Running. It can continue many hours and It doesn't finish. ...
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0answers
65 views

Length / transpilation issues with Grover's algorithm

I would like to discuss the discrepancies between what we see in the simulator versus what we see in the actual running of the code on any IBMQ machine for any qubits at 5 or above. I am doing a final ...
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1answer
43 views

Can Not Login IBM Quantum Experience! [closed]

When I click the “IBMid” for the first time, I can see the login page and input my username and password. However it return to the initial page(https://quantum-computing.ibm.com/login) and after that ...
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2answers
67 views

IBM Q - Individual Run Results

In Qiskit, is there a way to get the individual results from each shot on the IBM quantum device (instead of simply the summary statistics)? The result JSON file provides the count of all the 1024 ...
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1answer
79 views

Quantum Phase estimation with $2\pi$ replaced with $2e$

The QPE on IBM platform finds the eigenvalue of a unitary operator, i.e $$U|\phi\rangle=e^{2\pi i\theta}|\phi\rangle$$ and uses the rotation operators as $$U(\theta)=\begin{bmatrix}0 & 1\\ 1 &...
3
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1answer
51 views

Gate characteristics of different platforms

I would like to know if there is a place in which is summarized the gate characteristics of the different quantum computer existing (IBM,Google, others). For instance, which kind of two qubit gate ...
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1answer
126 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 ...
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1answer
107 views

No histogram appears in my job results

Newbie here - logged in to IBM Q Experience on a MacBook Air with up-to-date OS (macOS Catalina 10.15.7) and Safari browser (14.0). I can build a circuit in Circuit Composer, select a back-end in Run ...
3
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2answers
319 views

Traveling salesman problem in Qiskit: cannot find a solution on simulator

I am trying to solve Traveling Salesman Problem (TSP) in Qiskit based on Qiskit Tutorial. I used TSP for four cities described by this distance matrix: $$ D = \begin{pmatrix} 0 & 207 & 92 &...
2
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1answer
123 views

A problem with IBM Q, NameError: name 'iBMQ' is not defined

I 'm trying to reproduce the code given in the Qiskit summer school here. The code is: ...
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1answer
1k views

What's meant by the depth of a quantum circuit?

I'm using Qiskit to create quantum circuits wherein I've this attribute called depth. The documentation states it is the length of the critical path here. What does ...
4
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1answer
114 views

How to perform this $d$-dimensional unitary operation on IBM Q?

$U_{a,b}=\sum^{d-1}_{x=0}\omega^{bx}|x+a\rangle\langle x|$,$\omega=e^{\frac{2\pi i}{d}}$,$a,b\in\{0,1,2,...,d-1\}$ Can someone please give me the pic of the quantum circuit?
2
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1answer
82 views

Bernstein-Vazirani Gate IBM Q Noise

When running the attached Bernstein-Vazirani gate on IBM Q, with 1024 shots on ibmq_16_melbourne, I receive the expected result of "00110" with 26.563% success. I notice that there is a lot ...
0
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1answer
52 views

No backends assigned to my Account

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&...
2
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2answers
60 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 ...
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1answer
52 views

Composing teleportation circuit in Qiskit Circuit Composer

I'm trying to create the teleportation circuit in IBM Qiskit Circuit Composer. ...
2
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3answers
630 views

How can I obtain transformation matrix of a quantum circuit in the Qiskit?

I need to draw a quantum circuit in Clifford+T library and obtain automatically its transformation matrix. Is there any feature on Qiskit in this case?
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2answers
50 views

Unable to run a QRNG code

I am trying to run the above code on Vigo, Santiago and other backends. However, warning message as shown in the image apppears and no result is displayed even after hours of waiting. However, when I ...
3
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1answer
188 views

How to set overwrite to true with IBMQ?

I'm trying to get setup with https://qiskit.org, but I'm having a problem. I have dug around the internet for a bit and haven't been able to find anything. When I try to run ...
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3answers
122 views

Suppress Warnings

I wish to know how to suppress the following warning obtained on qiskit when I try to add two different types of noise to a qubit ...
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2answers
85 views
0
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1answer
52 views

JSONDecodeError with backend.run

I'm trying to follow tutorial on pulse simulation described in qiskit.org. The generated PulseQobj is well executed with AER simulator, but it throws JSONDecodeError when using real backends (ex. ibmq-...

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