New answers tagged stim
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Inverted memory X and memory Z logical error rates for unrotated surface code in Stim?
I don't know what's causing that inversion but...
The two extra hadamards for X-type stabilisers mean a higher depth circuit with more chance for an error, causing a higher logical error rate in a ...
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Handling lots of data points in Sinter Graphing
You can use the plot_args_func argument of sinter.plot_error_rate to customize how the lines look. It should return a dictionary ...
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Sinter: save detection counts
No, there's no support for this in sinter.
That said, it's relatively easy for you to just sample the detection counts on your own:
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Accepted
What's hook error in surface code?
A hook error is an error that occurs in the middle of a stabilizer measurement cycle, producing symptoms that would require multiple data errors when not in the middle of the cycle.
For example, one ...
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How to resolve ValueError: The circuit contains non-deterministic observables
Having non-deterministic observables or detectors is one of the most common and difficult errors you will encounter when using Stim. I call it difficult because it's a mistake in your circuit but ...
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Accepted
Are there qiskit or stim examples of how to decode a subsystem code
The main concept you need to know, to encode a subsystem code into Stim, is that Stim circuits have no concept of a "code". But Stim circuits understand producing detection events by xoring ...
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Differences in Simulating Syndrome Measurement Circuits with Prepared States : $|0_L \rangle$ vs $|0\rangle^{\otimes n}$
All qubits starts in the $|0\rangle$ state at the start of the circuit, so operations that noiselessly measure Z observables or stabilizers at the beginning are effectively no-ops.
Operations like <...
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Modelling correlated measurement errors in Stim
Currently, the only way to have a correlated measurement error is to insert CORRELATED_ERROR on the qubits just before measuring. If you are always reset-ing the ...
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Understanding Error Propagation in Stim's Circuits
In circuit 1, qubit 17 is being used to measure the stabilizer Z0*Z1*Z5*Z6. It commutes with all the X stabilizers you measured earlier, and the circuit started ...
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Two-qubit depolarizing error convention in Stim
If you want to use a depolarizing probability $p$ that includes $II$, multiply $p$ by 15/16 before giving it to stim's DEPOLARIZE2 instruction. (By 3/4 for ...
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Accepted
Simulating multiple logical qubits with stim
How would the detector annotations work? I understand how they work for a single logical qubit, but when the circuit has multiple logical qubits, would it be enough to just specify sets of ...
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Using Deterministic Errors in Stim Detector Circuit and decoding with Pymatching: X_ERROR(1) failing in PyMatching
If you're trying to enumerate how errors are corrected, you shouldn't be telling pymatching which errors you are inserting. It will just end up correcting them perfectly (once this probability 1 ...
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