All Questions
Tagged with python or programming
1,751 questions
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Operator 'Q' for a 3 ancilla and 1 wire qubits QAE circuit?
I have a simple $A$ operator, H-R4-H, which when applied to $|0\rangle$ gives a 14.6447% probability for $|1\rangle$ that I want to measure using Quantum Amplitude Estimation. How do I go about ...
- 295
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39
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Understanding Amplitude Amplification in the Original HHL Algorithm vs. Modern Implementations
Understanding Amplitude Amplification in the Original HHL Algorithm vs. Modern Implementations
I'm studying the original HHL algorithm from the 2009 paper (arXiv:0811.3171) and trying to implement it ...
- 171
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Is it useful to define a simple hardware-neutral data format for quantum optimization?
I’m new here.
I’ve been experimenting with quantum-inspired optimization and created a very simple, hardware-neutral data format (JSON) to describe optimization inputs and parameters before they are ...
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1
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127
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Drawbacks of writing a compiler in Smalltalk
Sorry for the vague title, what I’m really asking is: when writing a compiler for a quantum DSL, many languages have chosen an imperative or functional host language. Few, if any, have chosen a purely ...
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1
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214
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Converting qubit eigenstate to pyscf eigenstate
I want to convert a PySCF wavefunction in terms of CIstrings to a representation of a qubit state after Jordan-Wigner transformation of the Hamiltonian.
Qiskit-nature keeps the molecular ordering of ...
- 117
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1
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74
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Unable to generate parity check matrices with generator matrices for CSS-T Code
In this paper, the authors provide a method for constructing qLDPC CSS-T codes. They provide example generator matrices for the binary linear codes $C_1$ and $C_2$ such that $Q(C_1, C_2)$ is a CSS-T ...
- 321
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87
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Qiskit Sampler job failed?
Im making a quantum SVM with the quantum kernel using qiskit. Right now, im trying to implement the noise model using the fake provider.
...
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1
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62
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Limits of Hamiltonian Simulation on current IBM devices
I'm trying to simulate the 1D Ising Model with open periodic boundary conditions using the 2nd order Trotter product for 5 spins sites with J = -1.2 and h =-0.7.
$$ H_{Ising} = -J\sum_{i=0}^{spinsites ...
- 102
4
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2
answers
270
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Stim: What is a good workflow for adding non-trivial detectors?
I have been using Stim for a while now. Still, I find it particularly difficult to add non-trivial detectors in Stim (such as the in-place access of the Y-Basis Gidney introduced), and I’m wondering ...
- 334
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1
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115
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Signal processing operator implementation with quantum circuit
In the paper "Grand Unification of Quantum Algorithms", the following operator is introduced in eqn. (27) of said paper:
$$\hat{\Pi }_{\phi } = e^{i\phi (2\hat{\Pi }-\hat{I})}$$
The operator ...
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vote
1
answer
170
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Calculation of error probability in detector error model
I'm working with Stim to analyze error probabilities in quantum error correction circuits, and I'm encountering a confusing aspect regarding the DetectorErrorModel (DEM) output.
Consider Steane code ...
- 89
2
votes
1
answer
160
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Qiskit IBM Runtime: least_busy() raises QiskitBackendNotFoundError even though backends are listed
I’m trying to connect to IBM Quantum backends using Qiskit Runtime Service.
Here’s my code (based on IBM Cloud setup guide):
...
- 21
2
votes
0
answers
59
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Unexpected behavior of Qiskit IntegerComparator
I have two problems with the Qiskit IntegerComparator: I apply a comparison of a quantum register content with a classical integer in Qiskit and look at the ...
- 117
5
votes
1
answer
175
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What resources/ set of resources will fully cover the content tested for IBM Qiskit v2.X Developer Certification?
Under the IBM Qiskit v2.X Developer Certification webpage, there are a few courses and resources listed (e.g. the 5 course series from IBM). However, do they fully cover the content tested in the ...
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2
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2
answers
97
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Converting numpy array representing Choi matrix to Kraus operators in QuTip
I want to convert a Choi matrix into a corresponding set of Kraus operators.
I start out from a numpy array representing the Choi matrix. I convert it to a QuTip Qobj object and then convert it to ...
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