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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5 votes
1 answer
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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 ...
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0 votes
1 answer
537 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} = ...
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3 votes
1 answer
209 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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2 votes
0 answers
137 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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0 votes
0 answers
41 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 votes
2 answers
377 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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1 vote
0 answers
85 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 ...
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3 votes
1 answer
155 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 ...
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2 votes
3 answers
185 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 votes
1 answer
99 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 ...
1 vote
2 answers
93 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 ...
3 votes
0 answers
111 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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0 votes
0 answers
117 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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-1 votes
1 answer
65 views

Handle Qiskit Exception 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 ...
4 votes
1 answer
59 views

Is there a 'retry' logic in job manager?

This is a follow-up question to my earlier post. I'm trying to filter a set of results obtained from job manager, and the following code works when my circuit list doesn't contain too many elements: <...
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4 votes
1 answer
395 views

API error when trying to access IBM Quantum Computer using IBMQ API Token

I'm trying to write a code so that if the token exists then it loads the account or else it asks the user for the API token. Below is the code for reference: ...
5 votes
1 answer
112 views

CERTIFICATE_VERIFY_FAILED after updating Python when trying to access results in IBM QE

I had a question earlier about the Numpy DeprecationWarning flooding issue. I just updated the Python in my regular jupyter notebook and have trouble running the following cell: ...
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2 votes
1 answer
195 views

Numpy DeprecationWarning flooding in IBM Quantum Lab

I'm coding using the Jupyter Notebook in the IBM Quantum Lab. However, I don't know why I see the following repeated message every time when I execute a quantum circuit: This message shows thousands ...
  • 2,238
3 votes
0 answers
64 views

IBM QE - Parameters that differentiate the various backends

I'm doing a university thesis using IBM's quantum backends. In my analysis I am making some considerations on what differentiates one backend from another other than the number of qubits and quantum ...
2 votes
1 answer
83 views

Is it possible to modify pulse schedules in QASM?

Is it possible to modify a pulse schedule of a circuit compiled using QASM? I know this is possible using OpenPulse, but it seems none of the IBM backends support OpenPulse. So is it possible to do ...
6 votes
3 answers
619 views

Why can I not apply a control gate/function to a gate like T, S, S dagger, ... (using IBM Quantum Experience)? Is there another option?

I am trying to use the circuit composer of the IBM QE. I am doing the inverse QFT on 3 qubits and therefore need a control on T and S dagger gates, but it won't let me. Does anyone know why or know a ...
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6 votes
3 answers
113 views

How to create the state $\vert 0 \rangle+i \vert 1 \rangle$ using elementary gates?

I am trying to write $|0\rangle+i|1\rangle$ in terms of elementary gates like H, CNOT, Pauli Y, using the IBM QE circuit composer. I was thinking some kind of combination of H and Y since $Y|0\rangle=...
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1 vote
0 answers
132 views

Measurement of any qubit state in Y-basis [duplicate]

how can I measure any qubit state in Y-basis in qiskit. there is this solution here How to measure in another basis but it gives the qubit's position on bloch sphere in z-axis where as I think it ...
3 votes
1 answer
316 views

Can I access device specifications of IBMQ paying devices?

I need to perform some tests for my thesis in real quantum computers, however, I only have access to IBM's free quantum devices (the maximum number of qubits I can use is 15, in ...
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-2 votes
1 answer
142 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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1 vote
2 answers
164 views

Random measurement of qubits

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2 votes
1 answer
105 views

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 ...
1 vote
1 answer
114 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 ...
6 votes
2 answers
453 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% ...
-2 votes
1 answer
74 views

how to generate a random sequence [duplicate]

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3 votes
1 answer
901 views

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
72 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 ...
4 votes
2 answers
298 views

Qiskit: simulate a circuit using a backend noise model

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  • 295
2 votes
1 answer
184 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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3 votes
1 answer
98 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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6 votes
1 answer
1k 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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2 votes
2 answers
199 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 $|00\rangle$ ...
2 votes
2 answers
141 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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1 vote
1 answer
136 views

IBMQ qiskit SSL error submitting job [duplicate]

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2 votes
1 answer
133 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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1 vote
1 answer
127 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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1 vote
4 answers
460 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 ...
-2 votes
3 answers
104 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? $$|00\rangle:\\ |01\rangle:\\ |10\rangle:\\ |11\rangle: $$
5 votes
1 answer
656 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 ...
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 ...
3 votes
1 answer
230 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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2 votes
1 answer
400 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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1 vote
1 answer
435 views

IBMQ: "Credentials are already in use"

Executing the following: ...
0 votes
1 answer
197 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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-1 votes
1 answer
43 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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