Quantum computing framework for writing programs and applications
Qiskit is an open-source software development kit (SDK) for working with quantum computers at the level of circuits, pulses, and algorithms.
Questions tagged [qiskit]
237 questions
0
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1 answer
Cannot understand control_fixed_ansatz in Qiskit VQLS implementation
I've been studying the VQLS algorithm and came across this Qiskit implementation:
https://learn.qiskit.org/course/ch-applications/the-variational-quantum-linear-solver
I'm having trouble understanding the circuit in the “control_fixed_ansatz”…
GloTura
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- 1
0
votes
1 answer
Multiple parameter hybrid classical-quantum neural network using pytorch and qiskit
I am working with a code for hybrid classical-quantum neural network which can be run on qiskit simulator. I am following the link…
0
votes
1 answer
Quantum: Define superposition as linear combination of orthonormal basis
I'm testing a code for define a superposition state using a percentage of both basis.
All seems to run well, when the linear percentage is real. But it fails when the percentage is complex parameter.
from cmath import sqrt
from typing import List,…
Sourcerer
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0
votes
1 answer
Import error when running Shor's algorithm on Qiskit
from qiskit import Aer
from qiskit.utils import QuantumInstance
from qiskit.algorithms import Shor
N = 15
backend = Aer.get_backend('aer_simulator')
quantum_instance = QuantumInstance(backend, shots=1024)
shor =…
Anita Pandey
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- 1
0
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3 answers
Where has the "units" sub-module in qiskit_nature gone?
I am trying to follow this qiskit "Electronic Structure" tutorial, but at the very first step, setting up the PySCF driver with the following
from qiskit_nature.units import DistanceUnit
from qiskit_nature.second_q.drivers import PySCFDriver
driver…
Tico
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- 3
0
votes
0 answers
How do I rough merge the surface code of distance 2?
from qiskit import QuantumRegister, ClassicalRegister, QuantumCircuit, Aer, execute, IBMQ
from qiskit.visualization import *
n_data = 4
n_ancilla = 3
n_measure = 7
qc = QuantumCircuit(n_data+n_ancilla,n_measure)
list_n = list(range(n_data))
list_a…
0
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0 answers
Python qiskit metal window is not responding
I am just a beginner today installed qiskit metal and tried to run the very first code. But when the window with qiskit metal opened up, I wasn't able to click anything. Every time I tried to click something, it displayed to me, that the window is…
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1 answer
issues encountered in using scikit-quant optimizers in Qiskit VQE workflows (Aer backend)
as I am testing all optimizers advised in qiskit.algorithms.optimizers reference page to evaluate their performance in a VQE qiskit nature workflow on the Aer backend with and without noise model, I decided to call scikit-quant optimizers BOBYQA,…
0
votes
1 answer
Qiskit 'No counts for experiment "0"'
Error 'No counts for experiment "0"' in line answer = job_result.get_counts()
here's my code
shots = 1000
backend_type = 'qasm_simulator'
backend = Aer.get_backend(backend_type)
provider = IBMQ.load_account()
#backend =…
0
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0 answers
Is it easier to rewrite a pyomo model into a Docplex or a Gurobi model?
I've got an optimization problem written in pyomo that I want to translate to Qiskit. The only issue is that Qiskit has the ability to take in Docplex or Gurobi models. My question is this:
Is it easier to rewrite a pyomo model into a Docplex or a…
Ahmad Bennakhi
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- 4
0
votes
1 answer
Combining quantum circuits in Qiskit
In Qiskit the instruction to add two quantum circuits
qc1 + qc2
produces the following error
"unsupported operand type(s) for +: 'QuantumCircuit' and 'QuantumCircuit'"
I'm guessing my library must be missing something but as I'm new to Qiskit and…
user21783727
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- 2
0
votes
1 answer
qiskit-aer-gpu: cudaErrorNoKernelImageForDevice: no kernel image is available for execution on the device
My GPU is:
description: VGA compatible controller
product: GK107 [GeForce GT 740]
vendor: NVIDIA Corporation
physical id: 0
bus info: pci@0000:02:00.0
version: a1
width: 64 bits
clock: 33MHz
capabilities: pm…
aneela
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0
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0 answers
Intuition behind probability amplitudes, probabilities and Bloch sphere
In mathematics, let’s assume the original basis is [1 0] and [0 1].
We can write [1 1] as a linear combination of the original basis.
Where:
We can write [1 -1] as a linear combination of the original basis.
Where:
Further let’s assume [1 1]…
kivk02
- 599
- 1
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- 16
0
votes
1 answer
Issue in Qiskit VQC with Amplitude Encoding for state preparation
I have a problem in my code for quantum neural network.
I tried to encoding 16 classical vectors to 4 qubits.
The function for amplitude encoding in my code as below:
def amplitude_encoding(num_qubits,x):
qc = QuantumCircuit(num_qubits,name…
Junggu Choi
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- 1
0
votes
0 answers
Qiskit Getting Started - No repsonse to job = backend.run(transpile(qc, backend=backend), shots=1024) and then error on retrieve_job
Stepping through the Qiskit Getting Started steps, I run the step:
run job on real hardware
job = backend.run(transpile(qc, backend=backend), shots=1024)
and get nothing back. So, I then run the next step
or retrieve previously-run job
job =…
anacondauser
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