χR(∣qubit_T⟩⊗10) ≤ 18

BK T-type orbit, qubit.

Participate

Run it yourself, or point a coding agent at it.

git clone https://github.com/unitaryfoundation/stabrank
cd stabrank
# describe your decomposition in bounds/mybound.json
make fit BOUND=bounds/mybound.json ARGS=--write
make verify BOUND=bounds/mybound.json

fit solves for the exact coefficients, or tells you no exact combination of your terms reproduces the target. verify rebuilds the identity in exact arithmetic. If it passes, open a pull request adding the file and the leaderboard picks it up on the next build.

A bound the pipeline cannot check is recorded as cited and never takes a record.

← back to the board

Verification

verified   18 stabilizer terms reproduce |qubit_T>^{ot 10}, checked symbolically

Implied per-copy exponent γ ≤ 0.4170 against a published 0.3962, no improvement.

Compute

1 run; 0.001 CPU-hours; 0.001 h wall-clock; on Apple silicon laptop, one core; direct construction, no search.

Notes

Tensor product of the board's witnesses qubit_T-m4-upper-3.json, qubit_T-m4-upper-3.json, qubit_T-m2-upper-2.json: χ(|qubitT⟩⊗4) ≤ 3 x χ(|qubitT⟩⊗4) ≤ 3 x χ(|qubitT⟩⊗2) ≤ 2 gives χ(|qubitT⟩⊗10) ≤ 18, exponent 0.4170. First witness for this cell; it is the sub-multiplicative value the board already implied and does not move the exponent. Terms are the exact products (x0 and l concatenated, W and Q block diagonal) and coefficients the exact products, built by research/constructions/product_witness.py.

Attribution

this repository · stabrank research/constructions/product_witness.py · structured construction

Submission

JSON
{
  "schema_version": "0.1",
  "orbit": "qubit_T",
  "m": 10,
  "direction": "upper",
  "rank": 18,
  "provenance": {
    "author": "this repository",
    "reference": "stabrank research/constructions/product_witness.py",
    "method": "structured construction",
    "date": "2026-09-22",
    "github": [
      "vprusso"
    ],
    "compute": {
      "cpu_hours": 0.001,
      "wall_clock_hours": 0.001,
      "runs": 1,
      "hardware": "Apple silicon laptop, one core; direct construction, no search"
    }
  },
  "notes": "Tensor product of the board's witnesses qubit_T-m4-upper-3.json, qubit_T-m4-upper-3.json, qubit_T-m2-upper-2.json: chi(|qubit_T>^4) <= 3 x chi(|qubit_T>^4) <= 3 x chi(|qubit_T>^2) <= 2 gives chi(|qubit_T>^10) <= 18, exponent 0.4170. First witness for this cell; it is the sub-multiplicative value the board already implied and does not move the exponent. Terms are the exact products (x0 and l concatenated, W and Q block diagonal) and coefficients the exact products, built by research/constructions/product_witness.py.",
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      }
    ],
    "coeffs": [
      "4*sqrt(6)/27",
      "-2*sqrt(3)/27 + 2/9 + I*(2*sqrt(3)/27 + 2/9)",
      "2*sqrt(3)/27 + 2/9 + I*(-2/9 + 2*sqrt(3)/27)",
      "2*sqrt(6)/27 + 2*sqrt(2)*I/9",
      "2*sqrt(2)/9 - 2*sqrt(6)*I/27",
      "4*sqrt(3)/27 + 4*sqrt(3)*I/27",
      "2*sqrt(3)/27 + 2/9 + I*(-2/9 + 2*sqrt(3)/27)",
      "2*sqrt(6)/27 + 2*sqrt(2)*I/9",
      "2*sqrt(2)/9 - 2*sqrt(6)*I/27",
      "4*sqrt(3)/27 + 4*sqrt(3)*I/27",
      "4*sqrt(3)/27 - 4*sqrt(3)*I/27",
      "2*sqrt(2)/9 + 2*sqrt(6)*I/27",
      "2*sqrt(2)/9 - 2*sqrt(6)*I/27",
      "4*sqrt(3)/27 + 4*sqrt(3)*I/27",
      "4*sqrt(3)/27 - 4*sqrt(3)*I/27",
      "2*sqrt(2)/9 + 2*sqrt(6)*I/27",
      "2*sqrt(6)/27 - 2*sqrt(2)*I/9",
      "2*sqrt(3)/27 + 2/9 + I*(2/9 - 2*sqrt(3)/27)"
    ]
  }
}