Questions tagged [qiskit]
Quantum Software Development Kit for writing quantum computing experiments, programs, and applications. If appropriate, also use the [programming] tag.
291
questions
2
votes
0answers
11 views
How to simulate spin-1 systems with qiskit or on the IBMQ platform?
I am wondering how to simulate spin-1 systems with qiskit or on the IBMQ
platform? I want to initialize a qudit (a spin-1 system), and then define the usual operations (such as Sx, Sy, and Sz) on the ...
-1
votes
0answers
37 views
Why this value is extracted?
If I extract each value, probabilities are 0.344,0.015,0.063,0.235,0.031,0.235,0.063,0.015
Why period 3 is associated with the value?
if period is 2, $|0\rangle$ value is 0.5.
if period is 4, $|0\...
2
votes
1answer
627 views
Superdense coding circuit returns wrong result
I'm new to quantum computing, but everything I've read about superdense coding claims that, in the circuit below, Bob should receive a $[01\rangle$ from Alice.
Unfortunately, that's not what I get ...
1
vote
1answer
41 views
Achieve a control gate with 2 hadamard coins
I want to implement two Toffoli gates with 4 qubits:
3 serving as control qubits (the 2 hadamard coins and one other qubit) and
the last one as target qubit and 3 qubits (2 coins 1 target qubits) as ...
1
vote
0answers
63 views
Decomposition of an arbitrary gate using given matrix in Qiskit
If I have a matrix of say
$$
\begin{pmatrix}
1.5 & 0 & 0 & 0 \\
0 & 0 & 0 & 1.6 \\
0 & 0 & 1 & 0 \\
0 & 1 & 0 & 0 \\
\end{pmatrix},
$$
how do I ...
2
votes
1answer
51 views
What is the source of this TranspilerError when running qasm file?
I want to run this qasm file using IBM device.
However, there's always an error:
...
3
votes
1answer
90 views
Generate the state $\frac{-|0\rangle + |1\rangle}{\sqrt{2}}$ with qiskit: problem with Pauli-Z behavior
I want to construct the following state of a qubit using a quantum circuit: $\frac{-|0\rangle + |1\rangle}{\sqrt{2}}$
When I use the following qiskit code in Python:
...
0
votes
1answer
54 views
Installing qiskit with `pip install qiskit` gives `ERROR: Command errored out with exit status 1`
I have created a virtual environment by virtualenv (not conda) and tried to install qiskit by:
...
2
votes
1answer
51 views
Shor algorithm - how to obtain a period from diagram?
I'm studying shor's algorithm. I implemented in Qiskit and apriori I know that a period is 3 in my example.
However, unless I know about period, how to obtain this period only according to seeing ...
2
votes
1answer
374 views
What is a “shot” in quantum computation?
What is a "shot" in relation to quantum computing? I heard it is repeating time, but I don't understand it. Additionally, why is the default number of shots 1,024 in the IBM Q Experience?
One more ...
1
vote
1answer
152 views
How to run the Qiskit Aer simulator without noise?
I know that the Qasm Simulator execute quantum circuits with presence of noise, even if I do not specify the model of noise in options for that backend.
But how can I execute the circuits without ...
0
votes
2answers
23 views
Does anyone know how to get a list of all the Qiskit ML datasets, and if they can also be used for classical machine learning?
I am trying to create a Quantum Classifier and would like to try to test it out using a Qiskit ML dataset. However, I only know of the breast cancer dataset and I would like to try it on another ...
0
votes
0answers
24 views
How to properly make phase estimation with qiskit's modules
I have been making several experiments with qiskits' Quantum Phase Estimation modules, such as with QPE and EigsQPE. For example,...
1
vote
1answer
43 views
How do we discard or delete or resuse a qubit at the end, on Qiskit?
After I have finished computing and operating a specific circuit on a set of (say) 4 qubits, my final interest only is to deal with (say) two of the four qubits. Then, how do I recycle or delete the ...
1
vote
2answers
39 views
Is there a function that gives the ideal probability distribution of a measurement in Qiskit?
I want to compare the theoretical output of a circuit measurement with the actual output from a real quantum computer. I can approximate the ideal output by running the circuit on a simulator. ...
0
votes
2answers
53 views
Swap test to calculate inner product with qiskit for multi-qubit states
Is it possible to perform a controlled swap test with multiple targets with qiskit? I have tried using cswap(ancilla[0],qb1,qb2), where qb1 is an n-qubit register and qb2 is as well
0
votes
1answer
53 views
Prepending initial state to a quantum circuit in Qiskit
I am trying to generate a Quantum Phase Estimation (QPE) circuit in QISKIT the following way.
1 - First, I generate a QPE circuit with the following code:
...
2
votes
1answer
27 views
Are all the IBM QX mapping bidirectional?
The connection between physical qubits of IBM devices are all bidirectional or there are some architectures that there existing some unidirectional connection?
I found that in IBM Quantum experience, ...
2
votes
0answers
32 views
Easiest hash function to implement on Qiskit
Trying to build an Oracle circuit for Grover's algorithm that will try to find a desired input in order to get a certain output of a hash function.
Was wondering if there were any 4 or 8 bit hash ...
1
vote
1answer
29 views
from qiskit.aqua import… ImportError: DLL load failed: The specified module could not be found
Dear team and developers.
I am using qiskit on Python 36, windows 64bits
I have the same identical problem of Import from qiskit-aqua error
But the suggested solution (installing Numpy+mkl, I did ...
1
vote
1answer
36 views
Installing Qiskit Error: Building wheel failed!
I have been trying to install Qiskit in a virtual Python environment via pip through Miniconda command prompt on Windows 10. The issue is with using Microsoft Visual Studio tools such cl, nmake, etc. ...
2
votes
3answers
65 views
How to run a qasm file on IBMQ device?
I can found many qasm examples.
How can I run them on different IBMQ devices?
0
votes
1answer
35 views
How does qiskit finally implement a noise model?
I have been reading qiskit documentation for hours and I still don't get how does it implements noise in the circuit. I have understood that it works with a objects of the class QuantumError which ...
1
vote
1answer
31 views
PennyLane operations - Kerr, Displacement and Squeeze
I am familiar with the quantum gates of qiskit, but I become very confused when looking at the continous variable (CV) operations in the pennylane documentation. I am especially interested in the Karr,...
0
votes
1answer
54 views
How to obtain the noise of a circuit in Qiskit?
I referred to the following Qiskit's document: state_fidelity.
The inputs of state_fidelity are quantum state vectors or density matrices.
For example, $|00\rangle$...
0
votes
1answer
33 views
Return the value of a selected Qubit from Qiskit
I have a quantum circuit and the job has been run on the "statevector" backend, which runs only 1 shot.
Therefore is there a way to return the qubit state (0 or 1) specifically when selected ...
0
votes
0answers
36 views
Calculating the md5 of a text
I cannot see any libraries for Qiskit to calculate md5 hashes, is there one?
How could I go about calculating the md5 hash of text?
1
vote
1answer
78 views
Vey different results between qasm_simulator and quantum computer
I've started playing around with circuits only recently and decided to try out and implement a 4-qubit Grover's search using qiskit.
When I run my python script using the qasm_simulator, I get the ...
0
votes
2answers
90 views
'IBMQFactory' object has no attribute 'load_accounts'
I am following this qiskit workshop from https://colab.research.google.com/github/mtreinish/qiskit-workshop/blob/master/Workshop.ipynb . After adding my API key I had encountered the error ...
1
vote
1answer
50 views
How is quantum error applied to the qubits?
I am trying to check the way qiskit has the noise implemented. I have read how is this theoretically done using quantum channels (see Nielsen and Chuang chapter 8) and I want to verify if qiskit ...
0
votes
2answers
45 views
Right way to use Quantum Phase Estimation using aqua
I have been experimenting with Qiskit lately, but I have found the implementation of algorithms in Aqua extremely confusing. Currently I am trying to implement a very simple circuit that will return ...
1
vote
0answers
56 views
Openfermion to qiskit
Is there a direct way to go from an object generated in openfermion to objects usable in Qiskit. I can't find anything about any plugin.
It's not too hard to translate into pyQuil and then to Qiskit ...
0
votes
1answer
46 views
0
votes
2answers
30 views
UCCSD in qiskit deprecated?
Is this now deprecated or moved? I've been looking for it. It was in
from qiskit.chemistry.aqua_extensions.components.variational_forms import UCCSD
1
vote
0answers
60 views
IBM qiskit vs Microsoft QDK [closed]
I am new to both IBM Qiskit and Microsoft QDK. I wish to understand which framework would be best suited for someone new to this field. I am lookig for the pros and cons of both frameworks.
2
votes
1answer
85 views
How to make a Shor's algorithm for an arbitrary number of qubits with Qiskit on a IBM machine?
So suppose you want to do a Shor algorithm on an arbitrary number of qubits using an arbitrary $a$ (the base number in the periodic function $a^x \mod c$) and $c$ ( the factored number). Making the ...
1
vote
0answers
40 views
Grover's algorithm for 3SAT problem gives erroneous results
I'm writing a code in python with qiskit that implements Grover's algorithm to solve the 3-SAT problem, but when I run it it doesn't give the correct annswer. I've checked the circuit with the ...
1
vote
3answers
152 views
How to realize this quantum error correction circuit on real hardware?
I want to realize this error correction circuit.
To do that, I created a circuit:
However, I cannot execute on real hardware.
How can I create a circuit to realize this correction on real hardware?
4
votes
1answer
70 views
Use Qiskit in other programming languages (C#, JavaScript and Lua)
I am exploring using Qiskit in other programming languages for game development, such as C# (for Unity game engine), JavaScript (Phaser.io) and Lua (LÖVE2D).
Is there a general way to call Qiskit ...
1
vote
1answer
54 views
Is it possible to get the $\alpha$ and $\beta$ (amplitudes) of a qubit in Qiskit?
Is it possible to get the $\alpha$ and $\beta$ (amplitudes) of a qubit in Qiskit, i.e. not only probabilities after measurement but complete quantum state?
2
votes
1answer
66 views
max_cut in qiskit aqua
Happened on some code, which I was hoping would run out of the box. However fails on the import
from qiskit.aqua.translators.ising import max_cut
I've not been ...
3
votes
1answer
47 views
Is qiskit_backend_monitor magic function depricated?
I've upgraded qiskit for the first time in a while and I've discovered that the magic function for displaying backend information doesn't seem to work properly.
Here's what I've tried running:
<...
2
votes
0answers
50 views
Simulation for the [5,1,3] stabilizer code in Qiskit
Sorry that I keep asking questions for the same subject. It is driving me crazy.
I have followed the [5,1,3] stabilizer code circuit designed by Gottesman in page 35 in his paper (also illustrated in ...
4
votes
2answers
90 views
How to implement the CCH gate in quantum computers available in clouds?
How to implement CCH gate in quantum computers available in clouds? If there is not any gate directly available for it, what are the possible ways to represent CCH?
2
votes
3answers
72 views
Pauli I in eoh procedure doesn't become a global phase gate in qiskit evolution_instruction method. Possible consequences
If one has two qubits in arbitrary stats and wishes to apply a controlled version of some global phase gate $P(\varphi) = \begin{pmatrix} e^{i\varphi} & 0 \\ 0 & e^{i\varphi} \end{pmatrix}$ ...
2
votes
2answers
102 views
Qubit measurement is followed by instructions. Error code: 7006 [duplicate]
Trying quantum teleportation in
https://github.com/Qiskit/qiskit-textbook/blob/master/content/ch-algorithms/teleportation.ipynb
Succesful runs in 'qasm_simulator', but when switching to IBMQBackend('...
1
vote
1answer
160 views
How to implement if statement based on measurement results in qiskit?
I tried to implement three qubit bit flip code in qiskit and need to get the result of measurements and then apply recovery quantum operations conditioned on the measurement results. The following is ...
3
votes
1answer
100 views
Qiskit in Julia language?
Is it possible to use Qiskit in Julia language? Or is there any wrapper that can be used to call the package from Julia language?
-3
votes
1answer
60 views
Help me understand this warning while running qiskit command IBMQ.load_account() [closed]
Getting this warning, help me understand this
"C:\Users\XYZ\Anaconda3\lib\site-packages\qiskit\providers\models\backendconfiguration.py:337: UserWarning: dt and <...
0
votes
0answers
49 views
deliver a quantum register to/from a function in qiskit
Can I create a function in qiskit which receive a quantum register as an argument, and/or returns a quantum register?
In the example below, I created a quantum register, and a quantum circuit which ...
