// Quantum Computing
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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…

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…

is it true (H⊗H)CZ(H⊗H) = CNOT?, I have calculated it but did not get the right result. But people said that the result of the operation is the CNOT gate.

I often see the papers saying that a T gate can be implemented by preparing a magic state and using gate teleportation (1-bit teleportation) as shown in the first figure below. On the other hand, I al…

I'm looking for open-source code that implements lattice surgery merging and splitting between two rotated surface code logical qubits in STIM (for d=3 or above). Whilst there are some excellent expla…

I want to know how to solve a 01 Knapsack problem (or any optimization problem) on real Quantum Hardware only. I don't want to use an Application class or any classical simulation technique. If anyone…

I want to solve QUBO with non-zero diagonal elements in matrix Q using QAOA. But I want to solve for a large enough problem size (30+ variables) and hence want to divide my circuit into subcircuits. C…