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. As of August 2020, there are 20 processors on the IBM Q Experience ranging from 5 to 53-qubits. Note: Some systems are only available to hubs, partners, and members of the IBM Q network.

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How to perform this d-dimension 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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Bernstein-Vazirani Gate IBM Q Noise

When running the attached Bernstein-Vazirani gate, on IBM Q, I receive the expected result of "00110" with 26.563% success. I notice that there is a lot of noise in the results and am ...
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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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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
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Composing teleportation circuit in Qiskit Circuit Composer

I'm trying to create the teleportation circuit in IBM Qiskit Circuit Composer. ...
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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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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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1answer
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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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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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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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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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Can not see my notebooks in Quantum Lab

I am recieving this error when trying to access my Quantum Lab on the IBM-Quantum Experience website: ...
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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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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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1answer
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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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1answer
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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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How can I run a job as offline on real hardware?

Can I run circuits on real hardware as offline? I mean that a job with 100 circuits may take a long time and I want to shot down my laptop in running time. In the meantime, can the real hardware run ...
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How can i run a quantum circuit with parameterized gates many times on quantum experience?

I want to run a quantum circuit many times on real hardware so that this circuit has some of the parameters that I must change them each time (some of the angles of gates must change each time). how ...
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0answers
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qasm_simulator generating identical results repeatedly

I wish to run a very simple circuit on the qasm_simulator backend. My circuit is ...
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2answers
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How to realize Su-Schrieffer-Heeger model in Qiskit

This is a very specific question, which I try to implement a simple dimerized tight-binding Hamiltonian on qiskit. The model is one dimensional, and defined as $$ H = \sum_{\langle i,j\rangle} t_{ij} ...
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1answer
38 views

Noise model for 3 Qubit $|GHZ \rangle$ state measurement circuit

I found this example code in Qiskit documentation. Does this code signify that it is simulating noise as per the IBM Valencia quantum chip. If yes, what kinds of noise does it simulate? I executed the ...
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1answer
31 views

ClassicalRegister gives out just one line instead of two

Why do we have just one line here in c0 and not 2?
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2answers
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How to run VQE experiments on IBMQ Backends?

The VQE.run method only takes a quantum_instance of type QuantumInstance or BaseBackend and ...
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1answer
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Why is circuit inverse not working for EfficientSU2?

For some reason I get the following error when attempting to find the inverse of the EfficientSU2 VQE variational form: TypeError: 'NoneType' object is not ...
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Report measurement components for a given Hamiltonian measurement

I was wondering if there is a possibility to report measurement components when reporting the final expectation values of a qubit operator. For example, if we look at a simple Hydrogen molecule ...
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1answer
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IF statement in OpenQASM on IBM Quantum Experience

This is a simple circuit introduced in Moran's book "Mastering Quantum Computing with IBM QX" to demonstrate how if works in OpenQASM: ...
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1answer
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IBM Melbourne quantum computer performance and errors

What is the reason for high variation in measurement probability results of a simple 3/4 qubit measurement circuit on IBM Melbourne machine in comparison with the same circuit being run on IBM Vigo/...
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1answer
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Qiskit: Error when importing libraries for ADMM optimizer

I would like to try and ADMM optimizer as shown in Qiskit Tutorial in Quantum Lab. Firstly, I imported necessary libraries (copy/paste from the Tutorial): ...
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1answer
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How to perform a time evolution of a quantum state with Qiskit Aqua?

How can we perform a time evolution of a quantum state for a given Hamiltonian with qiskit Aqua operator flow? I'm interested in it due to its higher efficiency.
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Can I get the job variable from the job_id?

Suppose I run the following code: job = execute(qc, backend = backend, shots = 1024, optimization_level = 0) Then the job takes a long time to run. We know that ...
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1answer
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Why does job appear to be stuck in queue on IBMQ backend?

I have submitted a batch of circuits to ibmq_vigo using the IBMQJobManager and the batch is correctly split properly into ...
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2answers
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How to get the CNOT error rate between 2 qubits on a given IBMQ Backend?

How can the CNOT gate error between 2 qubits as shown on visual qubit coupling map on the IBMQ Dashboard be retrieved in Qiskit using the BackendProperties....
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1answer
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Unable to instantiate provider for research account locally

When I run IBMQ.load_account(). I have the error information: ...
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1answer
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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 ...
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2answers
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Generate a random bit sequence of 512 bits [duplicate]

How can I generate a random bit sequence of 512 bits on IBM Q experience using 3 or 5 qubits? Putting a hadammard gate and measuring would only give me smaller bit sequence due to limitation in number ...
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1answer
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Why does job execution time vary significantly across different IBMQ Backends?

I have run a batch of a few thousand random 2-qubit QuantumCircuits on multiple different IBMQ Backends, and the execution times seem to significantly vary across ...
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1answer
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How to optimize my HHL algorithm on qiskit?

I am following this HHL tutorial to solve the $Ax=b$ problem and have been using the general (inefficient) approach with the BasicAer simulator that they describe in section 4a. I would now like to ...
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What is the best way to use loop statements on a quantum computer?

I am interested in solving a time dependent linear partial differential equation of the form $Ax=b$ which, in classical computing, would amount to looping over solutions of $Ax=b$ where $b$ is updated ...
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1answer
47 views

How can I use the quantum volume to design the scale of my experiment?

I am designing an experiment which involves solving a linear system of equations of the form $Ax=b$. To do this, I am using the HHL algorithm on the IBMQ system. My experiment is scalable such that ...
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1answer
44 views

Quadratic optimization in Qiskit: Error when QuadraticProgram with quadratic constraint converted to QUBO

I prepared a quadratic optimization task with binary and integer variables and linear and quadratic constraints. I fed it into QuadraticProgram in Qiskit. After ...
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2answers
67 views

My IBMQ job hangs forever?

I am running a very simple script just to learn how to use IBMQ, but my job will hang indefinitely and I am forced to terminate it. ...
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1answer
47 views

Why running time of qasm simulator is significantly smaller in comparison with quantum machines?

I ran a 3-qubit measurement circuit on QASM simulator as well as on IBM Q Melbourne, Santiago and Vigo machines. The running time on the simulator is in few milliseconds (400-800) while in the case of ...
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2answers
39 views

What is the significance of transpiling time, validating time, in queue time and running time?

What is the significance of different transpiling time, validating time, in queue time, running time for the same circuit run on different quantum systems for same no. of shots in IBM Q experience? ...
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1answer
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What is the significance of varying the number of shots while running a circuit in a quantum machine and qasm simulator?

what is the significance of varying the number of shots while running a circuit in a quantum machine and qasm simulator? Does more number of shots give better/accurate result? I am running a simple 2 ...
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What causes the random variations in the probabilities with respect to the theoretical values, in IBM and QASM simulators?

When I measure 2 and 3 qubits after putting H gate on all of them, there is a variation in probabilities of results in comparison with theoretical values (25% and 12.5%, respectively). This occurs on ...
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2answers
67 views

quantum random number generator implementation in quantum lab

How can I generate and print a 32 bit sequence of 0s and 1s in Qiskit or IBM Q experience quantum lab using quantum random number generator implementation?
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2answers
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How to execute many circuits on an IBMQ backend?

I attempted to execute a list of $3200$ QuantumCircuits in Qiskit, each with the max_shots ...
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1answer
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How can we only use 8192 shots for an experiment with 14 or more qubits?

Let's say you want to do an experiment with 14+ qubits. You apply some arbitrary unitary operator $U \in (\mathbb{C}^2)^{\otimes n} \times (\mathbb{C}^2)^{\otimes n}$ to the state $|\psi\rangle \in (...

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