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Quantum Computing

Questions tagged [simulation]

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For questions about simulating either quantum computers or simulating things on quantum computers.

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I have two circuits (below) : first works fine (no complaints from stim); second comes back with a "non-deterministic detector" error. The difference between the two circuits is that the ...
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2votes
1answer
137views

The role of adding observables is not clear to me. Here are some points of confusion :(1)From the circuit I generate a detector error model using dem from which I generate twomatrices (pcm and lcm) ...
0votes
1answer
110views

I'm trying to understand how the probabilities in a stim DEM are calculated.I tried three simple cases; I understand the first, but can't seem to go beyond that :case 1: I understand the ...
1vote
2answers
169views

When I see performance curves of codes/decoders in papers (logical error rate vs physical error rate) I thought I understood what they represent (making the analogy to the classical version). When (...
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147views

I'm interfacing stim to my (custom) decoder. My decoder expects a parity check matrix and probabilities; similar to a BP-OSD decoder's input. To go from error detect model to these inputs I use a ...
1vote
1answer
76views

I understand what should go into the model given a syndrome measurement circuit with error sources. What I'm trying to understand what else gets added to it. Some papers add one or two "error ...
3votes
2answers
61views

I'm having trouble running QAOA on real IBM backends. I want to solve an optimization problem using QAOA with around 100 or more logical qubits on ibm_kingston, to see how far current devices can be ...
4votes
2answers
156views

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 ...
3votes
1answer
120views

For simplicity, assume the code is a CSS code and we're working with X stabilizers (Hx) and logicals (Lx).To estimate the logical error rate of this code, here are the steps I see taken by open ...
4votes
1answer
149views

My questions arised basically from playing around with the STIM "getting_started" notebook, regarding the part on the rotated surface code.There 3d syndrome extraction rounds are performed ...
0votes
0answers
84views

My goal is using Stim to simulate a fault-tolerant logical circuit, which have multiple rounds of logical operation -> syndrome extraction -> decoder. During my trials, I find that Stim cannot ...
4votes
1answer
266views

I'm trying to run quantum circuit simulations with Qiskit Aer using GPU acceleration (specifically an NVIDIA A100) in Google Colab Pro.Here's a simplified example I'm running:...
0votes
1answer
68views

I have been recently reading the classic paper https://journals.aps.org/pra/abstract/10.1103/PhysRevA.73.022334The paper claims a time complexity of $O(N \log{N} M)$ where $N$ is the number of qubits ...
2votes
1answer
103views

I'm reading through a stim overview paper and found a description of how a (single qubit) measurement is carried through a tableaux : Gidney paper,(page 9). I couldn't find another reference for this ...
0votes
1answer
134views

I have a syndrome extraction circuit that uses $N$ CNOT's altogether. The CNOT connection is the standard way of having data qubits as control and ancilla qubits as targets. These can inprinciple be ...

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