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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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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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1 vote
2 answers
67 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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1 vote
2 answers
178 views

Qiskit: simulate a circuit using a backend noise model

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  • 245
2 votes
1 answer
152 views

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 ...
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  • 12.3k
3 votes
1 answer
88 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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  • 647
6 votes
1 answer
991 views

My IBM quantum account has been disabled [closed]

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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  • 179
2 votes
2 answers
167 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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2 votes
2 answers
137 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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  • 21
1 vote
1 answer
124 views

IBMQ qiskit SSL error submitting job [duplicate]

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  • 11
2 votes
1 answer
96 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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  • 245
1 vote
1 answer
117 views

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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  • 800
1 vote
4 answers
356 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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-2 votes
3 answers
95 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? $$|00\rangle:\\ |01\rangle:\\ |10\rangle:\\ |11\rangle: $$
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5 votes
1 answer
537 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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0 votes
1 answer
58 views

Device Repetition 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 ...
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3 votes
1 answer
203 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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  • 33
1 vote
1 answer
249 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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  • 83
1 vote
1 answer
353 views

IBMQ: "Credentials are already in use"

Executing the following: ...
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0 votes
1 answer
169 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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  • 151
-1 votes
1 answer
41 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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2 votes
3 answers
131 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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1 vote
1 answer
110 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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  • 61
1 vote
0 answers
93 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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  • 33
2 votes
0 answers
76 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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1 vote
1 answer
156 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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  • 11
1 vote
2 answers
117 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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  • 1,511
0 votes
1 answer
101 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 &...
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  • 1,380
3 votes
1 answer
62 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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0 votes
1 answer
183 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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  • 33
1 vote
1 answer
148 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 ...
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  • 11
3 votes
2 answers
496 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 &...
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2 votes
1 answer
233 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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12 votes
1 answer
3k 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 ...
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  • 385
4 votes
1 answer
119 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?
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2 votes
1 answer
144 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 ...
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  • 21
1 vote
1 answer
62 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&...
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2 votes
2 answers
66 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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  • 385
1 vote
1 answer
130 views

Composing teleportation circuit in Qiskit Circuit Composer

I'm trying to create the teleportation circuit in IBM Qiskit Circuit Composer. ...
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  • 385
4 votes
3 answers
2k 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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1 vote
2 answers
52 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 ...
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  • 245
3 votes
1 answer
397 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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  • 33
0 votes
3 answers
193 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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  • 323
1 vote
2 answers
131 views

Unable to run program on different backends

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  • 245
-1 votes
1 answer
73 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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  • 31
1 vote
2 answers
513 views

Can I run Cirq on IBMQ?

Google's quantum computer is not yet available for the public. Is it possible to run Cirq on IBM's quantum computers, instead of Qiskit? And if so, how can I do it? Thank you!
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0 votes
1 answer
76 views

Syndrome showing unexpected results for the [5,1,3] QEC code in qiskit

I have used the encoding procedure mentioned on page 35 of https://arxiv.org/pdf/quant-ph/9705052.pdf for the [5,1,3] code and then built the circuit for measuring the stabilizers (XZZXI, IXZZX, XIXZZ,...
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1 vote
1 answer
141 views

Long running time at job

I try to launch QSVM algorithm (from Qiskit example ) on all real quantum devices (that is IBM Q) and get running time 5-30 seconds on one job. But if I use ...
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  • 33
2 votes
1 answer
274 views

Error when running HHL algorithm in Qiskit

I tried to solve a simple system of two simultaneous linear equations in with HHL algorithm in Qiskit. In particular the system is $Ax=b$, where $$ A = \begin{pmatrix} 1.5 & 0.5 \\ 0.5 & 1.5 \...
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0 votes
2 answers
43 views

Difference in length of RNG implementation using same circuit structure but different sizes

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  • 245
1 vote
1 answer
157 views

An effective way to submit all the jobs for VQE/QAOA at a time to an IBMQ machine?

In Qiskit, I am solving a VRP for 5 nodes and it creates 20 variables for a QUBO. It runs in a 65 qubit machines (any machine below that many fails). Now, in such a typical solvers for optimization (...
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