// Quantum Computing
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I am looking for a tool allowing to easily simulate noisy quantum circuits allowing for post-selection. Clifford only simulator might be enough for my purpose (but I want to know what exists in more g…

Is anyone aware of resources or algorithms that implement a triangle constraint check on three qudits (qutrits in my case)? Specifically, I am looking for a circuit that takes three qudits encoding $j…

I was looking into a definition of Deterministic Chaos and the best that I found was one link of a DOI on Zenodo https://doi.org/10.5281/zenodo.18821986 Does anyone knows another better source that ma…

I am studying the quantum fourier transform and don't quite understand the difference between strong and weak sampling. I am sure that inspecting specific quantum circuits for each sampling technique …

In order to test ideas about entanglement, I wish to generate, in a systematic way, all 2-qubit density matrices without unnecessary over-production. By 'systematic' I mean one iterates over a finite …

Recently, I have been studying entanglement-assisted quantum error correction (EAQEC) . I am interested in learning more about constructing an EAQECC from known codes, such as the Steane code. Fig. 14…

How to visualise MWPM working in surface code for multiple rounds, surface code with data errors and measurement errors should ultimately give a 2+1 D syndrome graph, how MWPM handle that to decode?

I'm trying to implement some of the surgery schemes to perform measurement of joint Pauli operators in qLDPC codes (like CKBB). In the papers, they often mention that after measuring the stabilisers o…

Overview: I am building GNN-based decoders for the Surface Code (d=5) and benchmarking them against MWPM. To ensure the ML model doesn't lose hyperedge information via clique-expansion, I built an ope…

I have been reading Knill's paper on the $C_4/C_6$ architecture and I am getting confused by how the Hadamard can be implemented. It is claimed in the paper that the Hadamard operation is transversal …

Consider a $d$ dimensional qudit. The computational basis states are $|0\rangle, \dots, |d-1\rangle$ . The generalized $X,Z$ operators are defined by $X|j\rangle = |j+1 \bmod{d} \rangle$ and $Z |j \ra…

I have been working already for some years on quantum computing and similar stuff but I must confess that so much technical focus has zoomed too much my understanding and my scope in some kind of the-…

I am trying to understand how AIRouting tool from qiskit is optimal for routing. Therefore I am trying to understand its choice of swap/ie the sequence of action applied. From what I understand in the…

I am reading $\textit{Quantum Computing for Everyone}$ by Chris Bernhardt and I came across the following passage in the section on $\textbf{Superdense coding}$ : Alice and Bob initially have one elec…

The idea is to have something similar to the save_resume_filepath argument in sinter.collect() but for the sinter.Task, i.e.: surface_code_tasks = [ sinter.Task( circuit = stim.Circuit.generated( "sur…

In pymatching, it writes : rather than predicting which exact set of error mechanisms occurred, we typically want to predict the outcome of logical observable measurements, which are the parities of e…

Suppose $\rho$ is an input state , and $\sigma$ is a recovered state obtained after approximately encoding $\rho$ in a quantum error-correcting code and then applying some recovery channel. Here, the …

Is it correct that this circuit teleports the CCZ magic state? If abc is qubits trying to take the CCZ gate as data qubit, is it correct that the CCZ gate is taken in abc in the last result if I follo…

Since the Maxwell field describes electromagnetic waves, and quantum mechanics tells us the vacuum has zero-point energy due to Heisenberg's uncertainty principle — can the Casimir effect be directly …

I'm using Stim's search_undetectable_logical_errors to compute the distance of quantum error correction circuits (specifically D7 and D9 Steane codes with flag qubits). To make the computation tractab…

I am running Sinter to find the logical error rate by running my .stim files. But I keep getting this error. I looked into another question posted in this platform regarding AssertionError , and the s…

I implemented a 5-qubit QFT circuit using Qiskit and performed quantum state tomography using an IBM backend. However, the reported process fidelity is only ~20%, which seems very low. I am trying to …

I’m reading the recent IBM paper arXiv:2506.03094 and it is unclear on how they complete their logical $T$ gate implementation. In surface codes, each $T$ gate typically requires real-time decoding an…

I'm at the first puzzle of Quantum Flytrap , I've tried to block the photons and to let them pass, but I'm never told that I've succeeded (or failed). What's the goal of the game? I'm feeling a bit st…