Questions tagged [ibm-quantum-devices]
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Underlying Hamiltonians and pulse level controls of different commercially available quantum computers
My research area is in quantum state transfer, and I am trying to perform a 'proof of principle' that requires the underlying Hamiltonians of quantum systems and the control I can have on these ...
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Current situation of quantum computing with respect to physical vs logical qubits
As an example I'm going to start with Google and IBM. Google has the Sycamore processor right now with 53 physical qubits. However I haven't found any info on how many logical qubits it can actually ...
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PulseSchedule jobs not getting submitted on Pulse enabled machines on IBM Quantum
There was a recent migration, referring the below document:
https://qiskit.org/ecosystem/ibm-provider/tutorials/Migration_Guide_from_qiskit-ibmq-provider.html
Before this migration, I was using IBMQ ...
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Retrieving job result attributes in Qiskit
I am trying to optimize a Hamiltonian using QAOA in IBM Qiskit.
I used the following 'minimize' function to get my result. (I am not including the whole code because it will get unnecessarily long).
<...
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How to get pulse-level historical calibration data for OpenPulse devices?
I see that there is a way to access historical IBM backend properties such as gate errors and gate lengths (discussed here). Is there any way to also get pulse-level historical calibration data for ...
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Running Pulse Schedules with different resilience levels
Is there a way to run a Pulse schedule with different resilience levels? I was thinking about passing the resilience level values in the options of Sampler primitive, but when I tried to run, it says ...
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How can visualise the old error map of Ibm backend if one save the calibration data of the backend at that time?
I have the calibration data of an Ibm backend and now I want to plot the error map of the device at that specific time.
How can I do this?
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How does error accumulate when entangling two distant qubits with limited connectivity?
My goal is to minimize accumulated error when entangling two qubits that cannot be entangled via a single native two qubit gate operation.
I have a coupling map/graph for the qubits of an IBM quantum ...
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List of IBM devices
A few weeks ago I was on a website that had a list of IBM quantum devices and it showed the topology and frequency of each of the qubits but I can't seem to find that anymore. I was hoping that ...
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New QASM2ParseError for old circuit on IBM composer
A while ago I wrote an example of quantum teleportation circuit in the IBM Composer which ran fine as of three days ago. Yesterday, however, when I try to run the circuit, I get the following error:
...
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IBMQ Open Plan Access: How many circuits can i run per job? How many jobs can i run in general?
I think my question is not difficult at all, but I don't find any Information about the Open Plan of IBMQ. Such as how many circuits I can run per job and so on.
I could not find the EULA too, I ...
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How to predict state vector of a quantum circuit in IBM qiskit
How to Predict the state vector output of the following quantum circuit?
...
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232
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What is a "quantum communication link"?
The IBM roadmap for scaling their quantum computers refer to a quantum communication link to combine together multiple smaller quantum chips. What is the technology that enables connecting together ...
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Unable to open Qiskit Assignments for Qiskit 2023. (Quantum Challenge 2023) [closed]
Unable to open Qiskit Assignments for Qiskit 2023. (Quantum Challenge 2023)
I was very excited to be a part of Qi skit 2023. I went through all the lectures in the crowd cast, but now I am very upset ...
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Why does my quantum circuit run so slow on a real IBM quantum hardware?
I have created a very simple circuit on qiskit to produce a Bell state:
bell = QuantumCircuit(2)
bell.h(0)
bell.cx(0, 1)
bell.measure_all()
And I then run it on a ...
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How to augment a QASM circuit for orbital rotation
Could anyone advise on how to properly augment the hamiltonian circuits in https://github.com/CQCL/ethz-hackathon22/tree/main/benchmarking/circuits for orbital rotation ? https://poe.com/s/...
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Exploiting virtual-$Z_{\theta}$ corrections in QEC
The work done by IBM Researchers to perform virtual-$Z_{\theta}$ gates allowed them to:
achieving zero-time relative phase shifts;
correcting $Z_{\phi}$ errors occurring when applying some gates -- e....
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How can I find the documented T1 time of a retired IBM system?
I need to find the published mean T1 time for the 'ibm_oslo' system that I used in an experiment a while back. Unfortunately, that system has now been retired and there's seemingly no way for me to ...
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Phase estimation of the Pauli-Y matrix
I'm trying to use the phase estimation algorithm to extract the eigen value for both eigen vectors of the Pauli-Y matrix using the ibm quantum experiance.
So far I have this for the possitive state |+&...
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Did the IBMQ Job Download change of ZIP results
today I realized the contents of the Zip File changed when downloading a completed job. Now when I download a job on IBMQ I get a zip file containing a info.json and a result.txt.
And I checked a job ...
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Is it possible to get access to the old noise model from a few months ago for Ibmq backends?
I performed an experiment on a real Ibmq backend, and the results were satisfactory. I now require the simulation of that experiment. The simulation is not sufficiently consistent with the old ...
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How does Qiskit CircuitSampler class calculate expectation values of operators?
I have been using Qiskit CircuitSampler class to calculate the expectation values of operators as described here. Now it turns ...
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Simulating cross talk of quantum hardware
I am working on some experiments on the IBMQ Guadalupe machine. Since access to the real hardware is time consuming and limited, I am trying to simulate the errors that occur on real hardware to the ...
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Does anybody have the crosstalk profile of the guadalupe system?
Does anyone have the crosstalk profile of the IBM Quantum processor Guadalupe? Or knows how I can get it?
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Execute using circuits on IBM hardware using visual studio code
I have wrote some code using Qiskit in Jupyter notebook using Microsoft Visual Studio Code. Is there any way to run directly on an IBM quantum computer through Visual Studio?
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IBMQ job was not run immediately after it was sent during my reservation [closed]
I got a problem when I sent a job during my reservation on ibmq_guadalupe. My job was in queue position 1 for almost 11 hours. Why was the job not run immediately after it was sent?
Is there any ...
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Sycamore 2 versus Osprey
Google recently hit key milestone by reducing errors: https://www.nature.com/articles/d41586-023-00536-w
I would like to know why Google's QPU had way fewer qubits than IBM's Osprey and if IBM also ...
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How do I change the x and y axis on the results histogram for a ibmq_qasm.simulation resulting histogram?
Im following a textbook and when they ran the same circuit with the ibmq_qasm_simulator, their results histogram had computational basis state on the x axis and probability on the y axis, however my ...
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Circuit containing only Hadamard gate returns bad results
I am new to quantum computing. My circuit contains only one qubit, one Hadamard gate and an operation to measure the state of the qubit. So, as I understand, the qubit is in superposition state after ...
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What is the IF_ELSE basis gate of the processor type Falcon r5.11 on the IBM Quantum platform?
I am master student currently working on a project using the IBMQ platform with qiskit. We are using the available quantum hardware with the processor type Falcon r5.11.
We would like to have a ...
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What problems can quantum computers solve right now which classical computers cannot solve? [duplicate]
I know that an error-corrected quantum computer with unlimited amount of qubits can provide a significant speed up compared to classical computers for specific kind of problems, e.g. searching in an ...
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IBM composer deletes my circuit
When I work on the IBM quantum composer and I switch to another circuit, my first circuit is destroyed and replaced by the second one. I thought it was a display bug, but when I restart the composer, ...
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Difference between IBM simulator backends
I'm an Msc student working on a quantum information project (VQEs on 4 qubits).
Our group is looking at different IBM simulators on the IBM platform, and have noticed that performance is different for ...
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I've wrote code on an outdated version of QisKit but what to run it on a quantum computer
like mentioned in the title I've got working code on an outdated version of QisKit which I run on my own IDE. However I am wanting to run this on a real quantum computer and I can't do this as IBM ...
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How to get the group of qubits which are on the same port of measurement?
From IBMQ's quantum computer, we know that logical qubits are mapped to their computers' physical qubits, and then they are measured to get classical bits (0 and 1). For instance, a 27-qubit ...
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problem with parametrized circuits
I used a circuit with one parametrized gate U(theta, phi, lambda), than I fixed the parameters with qc.bind_parameters and it's worked well. But the only step that don't work is the execution in a ...
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How the real IBM quantum computers apply arbitrary Rz(θ) gate rotation? [closed]
I want to ask the following questions:
(1) The basis gate set of IBM quantum computers is { Id, Rz(θ),√X, X, CNOT, reset}. Somebody said that IBM didn’t really apply Rz(θ) gate on the machine. The ...
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'RuntimeJob' object has no attribute 'queue_position'
I was trying to run a QAOA job using the below script:
...
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what quantum computing simulator can achieve drag-and-drop programing fuction without internet like IBM web composer?
I reallt need some kind of simulator can work like this.Quirk is similar but also require internet.can anyone know how to achieve this?It is very important for some eaducational lesson to students.
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Time Complexity (Big O Notation)
What is the time complexity of the two error-mitigation methods that are implemented in qiskit.ignis.
1- pseudo inverse.
2- least squares.
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Extracting results from a job when it is in a json form
I have downloaded a job from the COMPOSER JOBS but I get a folder containing three files.
632867a95ccea778be9446fb-info.json
632867a95ccea778be9446fb-input.json
632867a95ccea778be9446fb-output.json
...
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Retrieving jobs of an expired access device
I had private access to a quantum computer, but the access is expired. So Can I access to my jobs done on it ?
The '''backend.retrieve_job('')''' can't work because I cant load the backend (no access)...
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Reasonable Circuit Depth
So I'm auto-constructing quantum circuits that are being auto-generated from dimacs files along with the addition of the amplification function. It's for a satisfiability problem where the number of ...
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What can I use instead of mct (multi-controlled Toffoli)? (Grover's algorithm)
I implemented the general diffuser (for arbitrary qubits) in Grover's algorithm in terms of an Multi-controlled Toffoli (MCT) gate (it flips target when all controlled gates are 1). However, this gate ...
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how to fix error 'QiskitBackendNotFoundError' [closed]
This is my code:
from qiskit import IBMQ
IBMQ.load_account()
provider = IBMQ.get_provider('ibm-q')
qcomp = provider.get_backend('ibmq_16_melbourne')
...
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How does it work QasmSimulator with the option "density matrix"?
I am making some simulations on IBM Quantum Lab and as backend I tried to use QasmSimulator(method = "density_matrix") in order to simulate noise. I wanted to know how this method works in ...
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Interpreting VQE and QAOA based solutions in portfolio optimization
I am going through portfolio optimization using Qiskit. It really looks interesting. The module has both VQE and QAOA algorithms for optimizing the portfolios.
In the VQE based solution the ...
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Iterative quantum phase estimation - real device
I'm trying to implement the iterative quantum phase estimation on a real (IBM) quantum computer. I'm using the code below. When I run this code on a simulator the results are the expected ones, but ...
