Questions tagged [ibm-q-experience]

Use this tag for questions about IBM's quantum processors which are accessible online. DO NOT use this for questions about general Qiskit issues. As of July 2018, there are five processors on the IBM Q Experience: two 5-qubit processors, one 16-qubit processor and two 20-qubit processors (only available to hubs, partners, and members of the IBM Q network).

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IBM Q experience - error code 520

I have been running a variational circuit optimizing the parameters on the "melbourne" device. The system launches multiple jobs in parallel, and only gets the jobs accepted that my credit allows. The ...
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Find the Q-Experiment tutorial for beginner

Where I can find the previous Quantum-Experiment tutorial for beginners? (the one that was under https://quantumexperience.ng.bluemix.net/qstage/#/account)
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What does the error rate on the IBMQ website mean?

How is the error rate pointed by the arrow defined? How did you get it? thanks!
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47 views

What can be done so far with cloud quantum computing?

As a developer myself, I still do not understand what can be done so far with services like AWS BRAKET or IBM CLOUD QUANTUM COMPUTING. Can someone explain me the practical purpose of it in the present?...
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1answer
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Is there a way to output a circuit from Qiskit to the IBM Q Experience circuit composer?

I can't seem to find anything, but this seems like something that should be possible.
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Ripple Adder using Full Adder [closed]

I have been trying to implement a ripple carry adder using qsikit in IBM Q Experience. I was able to implement full carry adder but I am having trouble with ripple carry adder. I am able to add 100 + ...
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1answer
42 views

Can't access IBMQ (NameError: name 'IBMQ' is not defined)

When I type this: IBMQ.load_account(), I am getting this error. What does this mean, and how can I rectify it? ...
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1answer
38 views

Couldn't connect to IBMQ server

When I access IBM Q backend with qiskit code, an error occurs. from qiskit import IBMQ qt = 'xxxxxxxxx' IBMQ.save_account(qt) IBMQ.load_accounts() The error ...
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1answer
121 views

How to put a quantum computer on the cloud?

What are the infrastructures needed to build a cloud quantum computing service like IBM Q Experience? It seems this is not a trivial task. IQX has been running for more than 3 years and yet it is ...
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45 views

What is the URL of the result?

This answer states that: Once it is submitted, your job will be in queue. You will have to request by GET this job ID to get the answer from the backend. The GET URL is: https://quantumexperience....
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2answers
300 views

Explanation of output produced by the following quantum circuit

I've recently started reading about quantum computing and I apologize in advance if this is (and I think it probably is) a very simple question. I've created the following circuit. I believe I ...
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Bernstein-Vazirani algorithm in IBM Q Experience [closed]

I have composed the gate with IBM Q Experience, but I do not know how to set the answer. Please tell me how to set it?
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0answers
34 views

Vary parameter between shots

Is it possible to tell Qiskit to execute a parameterized gate where the parameter varies between shots? Let's say, for whatever reason, I'd like to speed up the dephasing of a qubit during a run. I ...
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1answer
33 views

qiskit - Creating your own ExperimentResultData object

Could someone guide me on how to create my own qiskit.result.models.ExperimentResultData object? I would simply like to create an object with some self-created dict ...
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1answer
24 views

Data file read/write from within IBM Q-Experience Jupyter notebook

In IBM Q-Experience how can I upload a data file that I intend to read from the python code?
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2answers
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Bell state: simultaneous measurement of two entangled qubits

What will happen if the two qubits in Bell state for a 2-qubit system, $\frac{1}{\sqrt2}(\left|00\right\rangle+\left|11\right\rangle)$ are simultaneously measured at the same instant? Two scenarios: ...
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1answer
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How to get more credits? [duplicate]

How can I have 150 or more credits? I mean I want to have '150/150 credits'.
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IBM Circuit Composer pane is blank

I'm new to IBM Quantum Experience. When I initially create a circuit using the composer, all is well, but when I save the circuit and open it again, the composer window is blank - no gates or wires. I ...
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28 views

Implementing B92 protocol on IBM Qx

I wanted to implement the B92 protocol on IBM Qx. Implementing the protocol would require that a particular qubit should not be measured when using a particular base i.e. there should be no output at ...
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0answers
54 views

Many jobs hanging after creating

I am running a VQE calculation running from a cluster using nohup. However, some of my jobs keep hanging with 'creating' and therefore my VQE is not converging/not working. However, at the same time,...
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Tensored vs ordinary measurement mitigation runtime

My experiments show that the runtime of actually applying the measurement filter matrices to circuit execution results is much slower for tensored mitigation than ordinary mitigation. Tensored ...
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2answers
495 views

Trying to build a circuit for quantum teleportation on IBMQ I get ERROR_RUNNING_JOB error

I am trying to build a circuit for quantum teleportation. On the simulator, everything runs fine and according to expectations, however, I am not able to run the algorithm on the real quantum ...
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0answers
79 views

Problem with measurement error mitigation using VQE

I am attempting to mitigate measurement error while running on one of IBM's real devices and am doing so by passing CompleteMeasFitter into ...
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1answer
39 views

Attribute error in Qiskit

Tried executing plot_histogram(result.get_counts(circuit)) where result has the job result and circuit is the Quantum circuit But an attribute error hits every ...
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1answer
39 views

Existing measurement error mitigation

Does IBM compute a measurement error mitigation calibration matrix that can be accessed from its device properties or somewhere else? Or does the user have to do that every time?
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1answer
54 views

Error on loading account with qiskit: “TypeError: __init__() missing 1 required positional argument: 'url'”

We are using an open account. We can not load the account even when we use the code on new notebook. The error message is: ...
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1answer
112 views

How to parallelly run a quantum circuit on IBMQ?

I am trying to implement the following circuit and my code is The above circuit has size 5 and depth 3. My question is, how can I run the circuit parallelly. I mean, the gate ...
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1answer
79 views

IBM 53 qubit cloud access

IBM announced a 53 qubit chip. Will the advertised chip be available for non-paying users, or only to IBM clients?
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1answer
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Is IBM Q composer using little-endian representation for multi-qubit states?

I am still confused when I am trying to use the IBM Q composer to reproduce some quantum circuits I found in different papers, and I am wondering if it is because there are two ways to represent a ...
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0answers
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Transfer trained machine learning model

I know just the basics of quantum computer i.e. superposition, entanglement, gates and few other kinds of stuff. Now the question is it possible to transfer a trained machine learning model from IBM ...
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1answer
310 views

What is a “barrier” in Qiskit circuits?

I just started studying IBM Qiskit, and cannot find details about the barrier method on the QuantumCircuit class. It is shown in the circuit drawing, but I never heard about it after reading quantum ...
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1answer
63 views

What is ''524 Server Error''?

When running my code, sometimes I find this 524 Server Error: Origin Time-out for url and then my code stop. The error is in ...
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0answers
254 views

Is it possible to run a general implementation Shor's algorithm on a real IBM quantum computer at least for N = 15?

I need to make a general implementation of Shor's algorithm that factors, at least, N = 15. I have been able to perform an implementation that works in simulators, with ProjectQ, but when running it ...
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3answers
99 views

How many classical registers are there on (IBM) quantum computers?

I have a circuit where I only use 3 qubits but need to utilize hundreds of classical registers. My questions are: what is the maximum number of classical bits on the current IBM Qs? What is the ...
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2answers
101 views

How to unpickle a Result object returned by an IBMQ experiment?

I have executed an experiment using IBMQ and receive a Result object. I am writing the ASCII repr of the result with f.write(res)...
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101 views
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51 views

Is it possible to simulate or replicate a cryptographic algorithm using Qiskit?

I would like to know if it is possible to recreate or simulate a cryptographic encryption algorithm like DES or AES using the quantum computing platform Qiskit from IBM?
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Running HHL tutorial on real backend

I tried to follow the HHL tutorial. Since the 8x8 problem is not realistically simulable (I stopped after a few minutes), I tried to make it run on another backend, starting on the easiest example: <...
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1answer
97 views

Backend Warning: The skip Qobj validation does not work for IBMQ provider. Disable it

I am using QAOA to solve the max-cut problem. On my machine, 10 qubits already takes a minute or two to simulate. I'm hoping that the ibmq-qasm-simulator could simulate 32 qubits faster than my laptop ...
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1answer
71 views

Can we simulate quantum many-body systems with IBMQ Experience?

Consider physical systems such as electrons in metals, or Bose-Einstein condensates, or any crystal, which are realised in the real three-dimensional space. If we want to simulate these systems on a ...
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1answer
101 views

IBMQ.load_account from stored ACCOUNT is failing on Qiskit 0.9.0

The following statement is causing an error in Qiskit Version 0.9.0: provider = IBMQ.load_account() Error Message: ...
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1answer
264 views

Why use U2 and U1 gate in IBM quantum computers?

I was wondering why IBM's computer were using U1 and U2 gates as part of there basis gates since as I understood, they are particular cases of the U3 gate. Why not just use U3 gate instead ? Thanks ...
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2answers
89 views

Access results from an experiment without having to run the script again

I have ran an experiment in one of the IBM processors and the work has finished. However, I can not obtain the data as histograms or counts in the qiskit notebook because the experiment was concluded ...
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2answers
113 views

Software for Quantum Computing

From what I read classical computing evolved so quickly because of the funding-applications cycle. Even though the cost to make denser IC's was increasing rapidly, the applications were also getting ...
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1answer
345 views

What is the IBM Q credits?

I find in this link that "A User has a maximum of 15 credits, and these credits are replenished upon the greater of 24 hours or when your execution has run off the queue." But what is credit? Is ...
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Job execution issue while using IBMQ Experience

I am trying to run QSVM algorithm on the IBMQ backend devices using the API_TOKEN. Below is the snippet of the code that I am running. The code fails the validation test and throws an exception after ...
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1answer
160 views

How do I interpret the readout error for a quantum computer?

For example, the ibmqx2 computer has the most recent readout error of $4.40 \cdot 10^{-2}$. Does this mean per 1000 measurements, 44 faulty results exist?
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1answer
81 views

Gate error in IBM-Q simulator vs real backend

Does the simulator of the IBM-Q supercomputer involves a CNOT gate error rate ? What are the main differences reasons in outcome between simulators and real backends in IBM-Q ? Best,
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1answer
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Chose how to map virtual qubits to physical qubits

I'm currently trying to specify an initial_layout for a circuit on a IBM Q device. Looking at the device's topology I would like to use the less noisy qubits in order to have the best performance. ...
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1answer
79 views

How is it possible to perform a c-not on 4 qubits using the same control qubits on IBM Q computers?

I was wondering after seeing ibmq_16_melbourne layout how it is possible to perform this circuit : It seems when looking at ibm q computers that a qubits can at max target 3 qubits because the arrow ...