Questions tagged [openpulse]
It is a language for specifying pulse level control (i.e. control of the continuous-time dynamics) of a general quantum device independent of the specific hardware implementation. [arXiv:1809.03452]
24
questions
0
votes
0
answers
10
views
Specifying the shape of pulse in RoughFrequencyCal
I've been following upon this document for device calibration.
https://qiskit.org/documentation/experiments/tutorials/calibrating_real_device.html
Is there any way to specify the pulse shape for the ...
- 51
1
vote
1
answer
28
views
Meaning of 'O_i' and 'Δ_i' terms in PulseBackend Hamiltonians
For OpenPulse enabled backends, the Hamiltonian can be retrieved via its configuration. The configuration holds a dictionary containing for example the Hamiltonian as a LaTeX string.
Example code:
<...
- 31
0
votes
0
answers
53
views
What does it mean for a Qiskit pulse to have a negative amplitude?
I'm going through tutorials on Qiskit Pulse. From this documentation, I can see that it is possible to give a pulse, such as a Gaussian a few different parameters. One of the parameters that I can ...
0
votes
0
answers
28
views
How to stretch duration of standard gates of an IBM Backend?
I want to stretch the duration of standard gates of an IBM backend to amplify noise (as proposed in one of the earliest implementations of zero noise extrapolation (ZNE) (https://arxiv.org/abs/1805....
- 399
1
vote
1
answer
74
views
Where are the multi-qubit openpulse computers?
As the question says, I'm looking to run some pulse schedules on quantum computers. Right now, I'm really only able to find ibmq_armonk (from IBM) to be an openpulse computer that I am able to use. I'...
- 61
1
vote
1
answer
91
views
What’s the difference between the DriveChannel and the Control Channel?
In my incredibly elementary understanding of superconducting qubits, a qubit is an LC circuit where the inductor has been replaced with a Josephson junction. In this system, microwave pulse operations ...
- 61
3
votes
0
answers
50
views
Why the pulse scheduler produces a different output from the original circuit?
As part of a larger code, I have to convert a quantum circuit into a Pulse scheduler. The problem is that the scheduler output is incompatible with the circuit output. In particular, the difference ...
0
votes
0
answers
20
views
What is an example of numbers that when used for a Gaussian pulse, would result in a rotation about the x axis?
For the playing of a Gaussian pulse, what is an example of numbers that could be plugged in for duration, amp, and sigma that would result in the pulse rotating something about the x axis?
Here is the ...
- 77
1
vote
0
answers
96
views
How do I find the qubit trajectory on the Bloch sphere when implementing an RY rotation on an IBM backend?
Suppose I use Qiskit to prepare the $| + \rangle$ state using a RY rotation,
...
- 45
1
vote
1
answer
147
views
0
votes
1
answer
214
views
Faster pulse generation in Qiskit
I need to be able to generate very quickly pulse schedules to submit them on quantum chips.
For the moment I am generating instances of QuantumCircuit:
...
- 4,612
2
votes
1
answer
145
views
How does the pulse.Shiftphase instruction in Qiskit Pulse work? [closed]
I have some questions regarding the mechanism of Qiskit pulse.ShiftPhase instruction:
Does it work like a Phase Shift $P(\theta)=\begin{bmatrix} 1 & 0 \\0 &...
- 496
1
vote
2
answers
244
views
Qiskit Pulse Notebook
When I downloaded the source code from Qiskit Notebook Accessing Higher Energy States and tried to execute it, the output and graph seem wrong in the step finding the frequency step which leads to the ...
- 159
2
votes
1
answer
117
views
configuration of FakeOpenPulse2Q
Can you help me to configure the FakeOpenPulse2Q() to produce more realistic pulses?
The code below instantiates 2 circuits and generates the waveforms for each.
...
- 51
2
votes
1
answer
127
views
Pulse waveform for 2-qubit circuit
I'm trying to reproduce the Bell-state pulse display as shown in this tutorial.
The code is very short:
...
- 51
3
votes
1
answer
64
views
Measuring second excited state |2> using "calibrations" not Open Pulse
I am tying to measure the second excited state in a system that does not support Open Pulse. Instead I am using calibrations. The method detailed here does not work. I get the error ...
- 41
2
votes
0
answers
96
views
Is qiskit documentation about determining $|0\rangle$ and $|1\rangle$ incorrect?
I'm using pi-pulse pulses on qubit Armonk for determining 0 and 1 by Machine Learning. But when I run the code from https://qiskit.org/textbook/ch-quantum-hardware/calibrating-qubits-pulse.html. I get ...
0
votes
0
answers
140
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 ...
- 162
2
votes
1
answer
97
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 ...
- 21
3
votes
1
answer
344
views
Job fails when using PulseSimulator: Job Status: job incurred error
I'm trying to simulate a basic circuit using the PulseSimulator in Qiskit. The following Qiskit Pulse code works when I run it on the real device, but not when ...
1
vote
1
answer
111
views
Is there a standard way to save pulse schedules akin to a qasm for a circuit?
If I create a QuantumCircuit, I can save all the information necessary to reconstruct the circuit using the qasm method. In addition, these qasm strings can be sent directly to the IBM quantum ...
- 45
2
votes
1
answer
102
views
How to deal with the relative phase from the evaluation of the not interacting qubit?
Every qubit is a realization of some two-level quantum system with $\left| 0 \right\rangle$ and $\left| 1 \right\rangle$ states. These states have their energies $E_0$ and $E_1$ respectively. By ...
- 4,138
2
votes
0
answers
86
views
OpenPulse: Where to get current pulse definitions for standard gates?
Is backend.defaults().cmd_def and backend.defaults().pulse_library kept updated regularly? Is this the correct place to pull the best calibrated pulses for the standard gates? I am working on a ...
- 579
2
votes
1
answer
435
views
OpenPulse: Modifying pulse sequence for basic gates
I'm trying to familiarise myself with OpenPulse but I'm confused about a few things.
Mainly, I would like to be able to take the pulse sequences that comprise standard gates on an IBMQ device and ...
- 337