Questions tagged [programming]
For any questions whose answer is expected to require code or programming notions. For questions about a specific framework (e.g. qiskit or cirq) please also include a more specific tag. If your question is about installation or any specific framework error, consider posting it in https://stackoverflow.com/ instead.
1,524
questions
0
votes
0
answers
11
views
Implementing a Quantum Recurrent Neural Network
I want to implement a Quantum Recurrent Neural Network and use it for time series forecasting.
As a starting point, I chose to implement it using the architecture given in this paper: https://arxiv....
- 1
0
votes
0
answers
5
views
QISKIT Metal Saves Error Generating Python Code
Background
I'm testing out the ability of the Metal GUI to save a simple circuit but it keeps generating code that gives rise to various errors. In the below code for example generates an error show ...
- 175
1
vote
1
answer
19
views
Is qiskit.pulse.SamplePulse deprecated?
I'm currently following along the book "Learn Quantum Computing with Python and IBM Quantum Experience" by Rodert Loredo and I am at chapter 8 - Generating pulse schedules on hardware. The ...
1
vote
0
answers
31
views
Are there libraries based on qiskit that can trace over unentangled qubits?
Suppose I have a QuantumCircuit object qc, which contains some unentangled qubits, and a Hamiltonian whose expectation value I ...
2
votes
0
answers
35
views
Create a superposition among the basis states of G for the hidden subgroup problem, implementing $\frac{1}{\sqrt{|G|}}\sum_{g\in G} | g,0\rangle$
I’ve been studying Simon’s problem and developing simulation models using Mathematica to extend the problem to other abelian groups and hidden subgroups of order $\geq 2$. I can now obtain the $h^\...
- 131
1
vote
1
answer
36
views
Simulator able to run SwitchCase in qiskit?
I am trying to run my circuit which is the following on a simulator. However, when I want to execute this on almost all the simulators the following error pops up:
"The control-flow construct '...
- 77
1
vote
0
answers
43
views
Is there a publicly available compiler for OpenQasm3?
Today (Nov 2023) using OpenQasm3 in the IBM ecosystem can only be done by exporting OpenQasm3 programs to python QuantumCircuit object via qiskit.qasm3.load and qiskit.qasm3.loads or by exporting ...
- 292
2
votes
1
answer
101
views
If_test() - Dynamic Circuits in qiskit
I am trying to run a dynamic circuit by having mid-measurement in my code as follows:
...
- 77
1
vote
0
answers
66
views
How to explain the output as $|-\rangle$
I am a complete newbie to quantum computing and qiskit. I am trying to implement $H$ gate in Measurement-Based QC architecture based on a paper "Qiskit As a Simulation Platform for
Measurement-...
- 11
2
votes
1
answer
80
views
How to measure in $\sigma_x$ basis in Qiskit? [duplicate]
As we know, Qiskit can give us the results of our measurements in computational or, better to say, $\sigma_z$ basis. However, I am courageous about measuring the qubit in, for instance, $\sigma_x$ ...
- 77
1
vote
1
answer
52
views
Phase shift on qiskit quantum teleportation simulation
I wonder in Qiskit why the phase shift occurred in my simulation and how I can turn it off.
I posted another question regarding the same simulation here, and while I tried to solve this on my own, I ...
2
votes
1
answer
56
views
Consecutive phased X rotation gates simplification
I have two consecutive phased X rotation (see cirq PhasedXPowGate gate definition), how to find both t' and p' angles (according to previoux cirq definition) so that two consecutive PhasedXPowGate are ...
- 429
1
vote
0
answers
121
views
Is there a way to implement a noisy CNOT gate using CUGate in Qiskit
Wondering if there's a way to implement the noisy version of CNOT (or CX) gate via CUGate using qiskit library for a given fidelity p?
- 69
0
votes
2
answers
36
views
Converting a dictionary to a statevector in Qiskit
Suppose we have a dictionary of computational basis states and their amplitudes:
{'01':0.5, '10':0.5, '11':0.5, '00':0.5}
How do I convert this (or any arbitrary ...
- 325
1
vote
0
answers
40
views
Quantum Lookup Table circuit
I am trying to use the paper "A Realizable GAS-based Quantum Algorithm for Traveling Salesman Problem (2022)". However, it never explains how the index converter works, beyond it being a ...
3
votes
1
answer
66
views
Single-shot error correction for the surface code with measurement errors
I am trying to implement a single-shot error correction for the surface code with data + measurement errors (both with prob. p), using the (build-in) BP+OSD decoder. I am mostly following these papers:...
1
vote
0
answers
55
views
How to discard one of the states in a product state in qiskit?
Suppose I have a state in qiskit which is a product of states, for example:
$| \psi \rangle = \left(\frac{ \sqrt{2} | 000 \rangle + |111 \rangle} {\sqrt 3}\right) \...
- 325
1
vote
0
answers
34
views
How to use parameters in QuTiP?
I am working with QuTiP to do some calculations based on my proposed Hamiltonian. The Hamiltonian of my system has some coupling constants that show the strength of coupling between matter and light(...
- 77
1
vote
1
answer
60
views
Set the initial state of the QuantumCircuit using the Statevector object
Suppose we have a 4-qubit quantum state state which is a Statevector object:
...
- 325
0
votes
0
answers
56
views
Is it possible to simulate a quantum algorithm on a classical computer? [duplicate]
I am designing a quantum algorithm that I would like to simulate and test, but I need to be able to simulate it on a classical computer.
- 19
1
vote
0
answers
35
views
How can I pass multiple embeddings in my function?
I have a problem with my code. I would like to try multiple embeddings in my kernel (I'm using the adjoint method). My idea is to pass them to the function and use them depending on what I pass. ...
- 93
1
vote
1
answer
69
views
How to collapse the subcircuits in a QuantumCircuit?
Suppose I have a QuantumCircuit object named FC, which explicitly contains the identity gate, and convert it into a gate using <...
- 325
1
vote
0
answers
42
views
How to create a 3-D state (array) of qubits in qiskit or cirq etc?
I want a 3-D cube-like array for state of qubits, on which I want further to implement different sets of rotations, etc, for cryptographic means. You can create a 2D grid qubit in cirq with ...
0
votes
0
answers
38
views
Error: module 'rustworkx' has no attribute 'visit' when trying to execute a quantum circuit in a real quantum computer from IBM
I am trying to use a real quantum computer from IBM. I have the next code:
...
0
votes
1
answer
25
views
DeprecationWarning: Back-references to from Bit instances to their containing Registers have been deprecated
I have the following code
for instruction, qargs, cargs in qc.data:
qbit: qiskit.circuit.Qubit = qargs[0]
print(qbit.register)
print(qbit.index)
the ...
2
votes
0
answers
34
views
Is there a Qutip equivalent of "expand_operator" for superoperators?
I want to calculate a superoperator for a small noisy subsystem consisting of $k$ qubits, and expand it to $n > k$ qubits, where the remaining $n-k$ qubits are not subject to any noise. ...
- 179
2
votes
0
answers
65
views
SLSQP optimizer(scipy.minimize) doesn't update parameters
I'm trying to find optimal parameters that minimize the cost functions.
In cost function, it calculates the classical-fisher-information at a certain point(phi[0] = np.pi).
Cost-function takes 3-...
- 105
2
votes
0
answers
93
views
Can D-Wave presently solve real-world problems that conventional computers cannot solve?
There are number of threads on this site about the ability of QCs solving real-world problems (see for example What are the practical applications of quantum computing in engineering by the year 2030?,...
- 85
0
votes
1
answer
82
views
Is there any programming project that implements one quantum error correction code or demonstrates it?
A gigantic list of all the error correction codes(Classical Domain, Quantum Domain, Classical-quantum Domain), see https://errorcorrectionzoo.org/all
There are lots of quantum error correction code. ...
- 141
1
vote
1
answer
102
views
Create qnode with density matrix on pennylane
I'm using pennylane.
What I want to do is
Create a qnode with the 2*2 density matrix of a single qubit one. It has the parameter as phi
Given density matrix:
$$\...
- 105
0
votes
1
answer
102
views
Design a full adder to add two 4-bits integer and measuring on 4 quantum states
I am trying to implement a full adder with minimum of 8 qubits to add two 4 bit integers. Integer 1 will be added on q[0-3] while integer 2 will be added on q[4-7]. The output will be measured on q[0-...
- 1
0
votes
1
answer
198
views
Cannot import tensorflow_quantum module in Colab
I was trying to install the tensor flow quantum module using the one given in their official website but it is showing these errors while installing.
...
2
votes
1
answer
112
views
Problems trying to plot the classical Fisher information with Pennylane
I'm working with pennylane. My goal is to plot CFI(Classical Fisher Information)with following quantum state.
With the above equation I set gamma as 0. Then It becomes:
If gamma is not equal to zero,...
- 105
3
votes
1
answer
55
views
Python code for D-Wave Annealer
In the below screenshot, I am aware of resolving the issue by reducing num_reads as the annealing time is exceeding my allowance. Although it works, my question ...
- 231
1
vote
1
answer
96
views
If Statement OpenQasm 2.0
in the documentation for OpenQasm 2.0 it says one can use an if statement like so:
if(c_reg==int) Quantum Operation.
However, I would like to execute the following: ...
- 31
2
votes
1
answer
236
views
New mode of Quantum and - or gate
I’m Aurelio, a computer engeneering student and I would propose a new quantum gate that maybe could be interesting to implement and use. I don’t know if such idea is already known but I have not found ...
1
vote
2
answers
57
views
How do I find out which packages of qiskit are compatible with eachother?
In particular I try to find out which version of qiskit is compatible with which version of qiskit-ibm-runtime. In my setup ...
- 185
1
vote
0
answers
106
views
Drawing circuit in pennylane
I am trying to draw the circuit in pennylane but even after my hours of trying I am completely unsuccessful.
Below is my code. Any little guidance of yours can help me a lot.
...
- 53
1
vote
0
answers
86
views
Qiskit spends a lot of time on method acquire of thread.lock objects
I am trying to run VQE algorithm with Qiskit, using the following code:
...
- 141
1
vote
1
answer
21
views
1
vote
0
answers
37
views
How to add a value of -1/2 on the amplitude of a quantum state?
I have a quantum state which is in
$ \cos(c*f(x) + \pi/4) |0\rangle + \sin(c*f(x) + \pi/4) |1\rangle$
by using bunch of RY gates. Now I want to measure the probability of getting the state at $|1\...
2
votes
1
answer
51
views
What are the theoretical minimum times for quantum and classical logic gates?
I'm interested in better understanding the ultimate limits on how fast quantum and classical logic gates can be performed. Based on principles like the time-energy uncertainty relationship, there ...
- 355
0
votes
1
answer
126
views
Cannot Download TensorFlow Quantum
Hey Quantum Computing community,
I cannot get TensorFlow Quantum to work even though I am using
pip install tensorflow-quantum
I have TensorFlow already on Visual ...
- 29
1
vote
3
answers
206
views
0
votes
1
answer
31
views
Displaying the circuit diagram associated to a circuit in Q#+Python
I am learning the Q# language, and my script is in Python (I am using the online Azure interface).
I created an example quantum circuit on three qubits:
...
- 1,454
2
votes
1
answer
66
views
Does subtraction circuit have a class like full or half Carry adder circuit in qiskit? one subtraction circuit code-example in qiskit?
I need a subtraction circuit to calculate Laplacian in edge processing, but I didn't find any class in qiskit.Do I have to write the code myself?
- 21
1
vote
0
answers
35
views
Converting Qubits to +-1/2 Spin System for Expectation Value Calculation
I have a quantum system that consists of spin states with eigenvalues of +-1/2. However, in quantum computing, qubits are typically represented as states |0⟩ and |1⟩. I want to calculate the ...
- 123
0
votes
1
answer
300
views
ImportError qiskit_ibm_runtime
When I try to import qiskit_ibm_runtime I get the following error:
...
- 123
0
votes
1
answer
94
views
Eigenstates differ between Qutip and Quspin
I am currently trying to adapt a code working well with Qutip to Quspin to optimize it.
I managed to create what I believe are the same systems with both libraries, but I don't get the same ...
- 111
0
votes
0
answers
36
views
Tf.einsum vs matmul for computing density matrix from a set of Cholesky decomposed matrices
I am trying to construct a density matrix of shape 256x256 from a set of T matrices. These T matrices are all Cholesky-decomposed matrices. But I am not sure if the ...
- 53