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Add run-length-encoded option to reference sample method #768

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Strilanc opened this issue May 9, 2024 · 0 comments
Open

Add run-length-encoded option to reference sample method #768

Strilanc opened this issue May 9, 2024 · 0 comments

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@Strilanc
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Strilanc commented May 9, 2024

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@Strilanc Strilanc mentioned this issue May 18, 2024
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Strilanc added a commit that referenced this issue May 18, 2024
@Strilanc
Add stim::ReferenceSampleTree to support loop folded reference samp…
cc18bfd 
…ling

Part of #768
Strilanc added a commit that referenced this issue May 21, 2024
@Strilanc
Add stim::ReferenceSampleTree to support loop folded reference samp…
9c97029 
…ling (#772)

Get a compressed tree representation of the reference sample by using
`stim::ReferenceSampleTree::from_circuit_reference_sample(circuit)`.

The reason for a tree, instead of raw run length encoding, is to support
nested loops (e.g. physical surface code rounds repeating within
repeated logical operations).

Example test:

```
    CircuitGenParameters params(10000, 3, "rotated_memory_x");
    auto circuit = generate_surface_code_circuit(params).circuit;
    circuit.blocks[0].append_from_text("X 10 11 12 13");
    auto ref = ReferenceSampleTree::from_circuit_reference_sample(circuit);
    ASSERT_EQ(ref.str(), "1*(''+2*('00000000')+4999*('0110000000110000')+1*('000000000'))");
```

Example benchmark (25 milliseconds to do a distance 31 surface code with
a billion rounds):

```
    CircuitGenParameters params(1000000000, 31, "rotated_memory_x");
    auto circuit = generate_surface_code_circuit(params).circuit;
    simd_bits<MAX_BITWORD_WIDTH> ref(0);
    auto total = 0;
    benchmark_go([&]() {
        auto result = ReferenceSampleTree::from_circuit_reference_sample(circuit);
        total += result.empty();
    })
        .goal_millis(25);
```

Part of #768
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@Strilanc