All Questions
Tagged with stim programming
29 questions
0
votes
1
answer
75
views
generating pure errors (destabilizers) by given stabilizer and logical group
Suppose we have a stabilizer code on n physical qubits, with stabilizer group S and assume fixed representatives of the logical operators L. Given this fixed set of generators for S and L, can we ...
- 11
0
votes
1
answer
71
views
Obtaining and Applying XX and ZZ Parity in Stim for Controlled Paulis
I am attempting to perform a CNOT between two surface code qubits in Stim, based on this paper by Daniel Litinski and Felix von Oppen.
The CNOT they perform is shown in the figure below (Figure 3 from ...
- 25
1
vote
1
answer
58
views
having REPEAT with circuit append
In Stim's domain specific language, you can reapetdly add a code clock, as following
REPEAT 10 {
# code block
}
Is there a way to add that with ...
- 11
0
votes
1
answer
101
views
What is TICK layer in stim
I'm trying to simulate a circuit in stim and I get the following error in my stack trace.
...
0
votes
1
answer
79
views
How to use stim to implement a specific circuit
I'm doing a QEC job, and I want to apply an error like $U_{err}(\theta) = \prod_j e^{-i\frac{\theta_j}{2}P_j} = \prod_j (I\cos(\frac{\theta_j}{2}) - iP_j\sin(\frac{\theta_j}{2}))$, where $\theta_j$ is ...
- 1
1
vote
1
answer
89
views
How do I extract information from stim.PauliString?
Suppose I have stim.PauliString("+Z_Z_ZZ__"). I want to extract its data information in Python: either as a string ...
- 41.9k
1
vote
1
answer
64
views
ValueError: non-deterministic detectors while using Stim to simulate Toric code
I am trying to simulate Toric code using Stim. Below is my simple circuit specification in Stim:
...
1
vote
1
answer
71
views
Appending a gate to a Stim circuit in C++
I am trying to use Stim in C++. Until now, most functionality worked as expected. However, I recently tried to construct a Stim circuit in C++ and pass it to Python via ...
2
votes
2
answers
124
views
Why I am continuously getting "failed to decompose hyperedges into edges" in Stim?
I have written a Hypergraph product quantum error correction circuit on Stim. The code is $[\![65,9,4]\!]$. I have put circuit level noise and I am using the sinter ...
-2
votes
1
answer
74
views
Python C++ Debugging Setup for Stim
If I want to build Stim from source so I can use the debugger to step through and better understand the C++ code, is there a recommended setup?
Is there a way to compile/debug only the C++ portion of ...
1
vote
1
answer
103
views
Using stim.TableauSimulator with python multiprocessing
I am trying to run some Monte-Carlo simulations whereby I have to call the TableauSimulator N times and use the measurement results to get an average. Is there any way to parallelise this loop? I am ...
- 11
1
vote
1
answer
164
views
Seeding a stim.TableauSimulator
When creating a sampler from a stim.Circuit (say, for example, using stim.Circuit.compile_sampler), one can provide a ...
- 11
1
vote
1
answer
235
views
Within Stim, how to trace back DEM error instructions to Stim circuit faults
If I have a line in a DEM e.g.
error(0.001) D0
is there an easy way to see which circuit faults in the original circuit contributed to that error mechanism?
- 1,060
5
votes
2
answers
1k
views
How can I visualize a stim circuit?
Is there any function I can call to visualize a stim circuit?
- 535
1
vote
2
answers
172
views
How do I specify the coordinates of dephasing errors in the surface code using Stim
I am trying to find the threshold of a surface code for dephasing error using pymatching and stim. I am unable to apply the Z_ERROR onto the qubits using the given format since a surface code will ...
- 43
1
vote
2
answers
351
views
Is there any reasonably efficient way of performing qudit circuit simulations using Stim?
Is there any reasonably efficient way of performing qudit circuit simulations using Stim? If so, then how much worse would the computational complexity scale?
- 246
5
votes
1
answer
647
views
Incorporating idling errors while using stim
Is there a smart way to incorporate idling errors for a quantum error correction code using the open-source tool stim (preferably using the tableau simulator)? I have perused the code repository, as ...
- 246
3
votes
1
answer
192
views
Efficient Way to Create an LUT in Stim
What is the fastest and most resource-efficient way to create an LUT decoder for a quantum error correction code using Stim (https://quantum-journal.org/papers/q-2021-07-06-497/)?
Specfically, I am ...
- 246
6
votes
2
answers
570
views
Simulating flag qubits and conditional branches using Stim
In a quantum error correcting code using flag qubits, it's common to have flag measurements that tell you it's necessary to do some extra measurements for safety. So, for example, I want to say:
...
- 41.9k
3
votes
1
answer
143
views
Stim: is it possible to add comments when creating a circuit?
I'm trying to create a Stim.Circuit, given a list of qubits and operations on them. Does the API support adding comments to the circuit's string representation? I've tried using ...
- 33
3
votes
1
answer
187
views
Measurement bitstrings to detection event bitstrings in stim
Does Stim have exposed functionality for converting a measurement outcome string into a detection event string?
I.e. I feed stim a string of 0,1's corresponding to measurements in a circuit along with ...
- 1,060
3
votes
1
answer
640
views
What is the meaning of "shots" and "rounds" in Stim?
I'm running simulations using Stim to get logical error rate vs. physical error rates of some quantum error correcting codes (QECC).
I looked into the documentation, but I'm confused about the meaning ...
- 2,252
4
votes
1
answer
680
views
Computing expectation value of a Pauli string on stabilizer states
I need some help on stim, where I'm trying to compute expectation values of Pauli strings. Hopefully I did not overlook on the documentation an implementation of ...
- 45
2
votes
2
answers
912
views
How to perform encoding and syndrome measurement in stim
I can generate the encoding circuit of a stabilizer code and can read it into
stim. For example for the $[[5,1,3]]$ code :
...
- 2,252
2
votes
1
answer
145
views
What is the syntax for general control gate in stim
For a stabilizer code with the stabilizers in canonical form, an encoding circuit has the form
that's a product of hadamard gates and general control gates : $H_i C_i(U_i)$. For example for
the $[[5,1,...
- 2,252
4
votes
1
answer
563
views
How to import a generic stabilizer code in stim
I just started using stim to simulate the performance of quantum error correcting codes. I hope this is the right place to ask questions about the subject. The
example code
with the repetition code ...
- 2,252
4
votes
1
answer
664
views
How do I pick a random Clifford operation in Stim?
I want to sample random n-qubit Clifford operations. How do I do that in Stim?
(Self-answering because this was requested when the feature already existed)
- 41.9k
4
votes
1
answer
390
views
Performing a generic single-qubit Pauli error channel in stim
I have a Pauli channel with disjoint probabilities $P_I$, $P_X$, $P_Y$, $P_Z$ (meaning $P_I + P_X + P_Y + P_Z = 1$) corresponding to Pauli errors I, X, Y, Z. Is there some way apply this Pauli ...
- 41.9k
7
votes
1
answer
617
views
'Best practices' for making Stim run as fast as possible?
I'm currently testing out an error-correction surface code circuit in Stim.
I've tried a 19x19 surface code over 10k rounds of syndrome extraction sampled 256 times, and this takes about 165 seconds. ...
- 1,060