χR(∣qubit_H⟩⊗10) ≤ 18

H-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

lean   qubit_h_m10_stabRankP_le_eighteen in LeanProofs.QubitHM10StabRank, machine-checked by Lean

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

Lean proof

This bound is backed by a machine-checked theorem: qubit_h_m10_stabRankP_le_eighteen in LeanProofs.QubitHM10StabRank. The recorded lake build confirms it compiles.

Compute

1 run; 0.01 CPU-hours; 0.01 h wall-clock; on Apple silicon laptop, one core; direct construction, no search.

Notes

χ(|H⟩⊗10) ≤ 18 from the cat_{4k+2} gluing of Qassim, Pashayan, and Gosset as restated by Kissinger, van de Wetering, and Vilmart (arXiv:2202.09202, Section 4.2) at k = 2: |cat10⟩ is proportional to (I ⊗ ⟨cat_2| ⊗ I)(|cat6⟩ ⊗ |cat6⟩), so it has at most 3 x 3 = 9 stabilizer terms and |T⟩⊗10 = (|cat10⟩ + |cat_10^→)/√ 2 has 18. Exponent log_2(18)/10 = 0.4170, the best finite-m value on the board for this orbit. QPG's own nine-term |cat10⟩ gives the same rank. Witness built here by research/constructions/kvv_cat.py and verified in exact arithmetic. Now at the lean tier: qubit_h_m10_stabRankP_le_eighteen in LeanProofs.QubitHM10StabRank proves stabRankP 2 |qubitH⟩⊗10 ≤ 18 against IsStabP 2 from this witness, the pointwise identity being decided by the kernel on integer coordinate vectors (see lean_proofs/LeanProofs/Stabilizer/Reflect.lean).

Attribution

Kissinger, van de Wetering, and Vilmart · arXiv:2202.09202 · literature

Submission

JSON
{
  "schema_version": "0.1",
  "orbit": "qubit_H",
  "m": 10,
  "direction": "upper",
  "rank": 18,
  "provenance": {
    "author": "Kissinger, van de Wetering, and Vilmart",
    "reference": "arXiv:2202.09202",
    "method": "literature",
    "date": "2022-02-18",
    "github": [],
    "compute": {
      "cpu_hours": 0.01,
      "wall_clock_hours": 0.01,
      "runs": 1,
      "hardware": "Apple silicon laptop, one core; direct construction, no search"
    }
  },
  "notes": "chi(|H>^10) <= 18 from the cat_{4k+2} gluing of Qassim, Pashayan, and Gosset as restated by Kissinger, van de Wetering, and Vilmart (arXiv:2202.09202, Section 4.2) at k = 2: |cat_10> is proportional to (I (x) <cat_2| (x) I)(|cat_6> (x) |cat_6>), so it has at most 3 x 3 = 9 stabilizer terms and |T>^10 = (|cat_10> + |cat_10^->)/sqrt 2 has 18. Exponent log_2(18)/10 = 0.4170, the best finite-m value on the board for this orbit. QPG's own nine-term |cat_10> gives the same rank. Witness built here by research/constructions/kvv_cat.py and verified in exact arithmetic. Now at the lean tier: qubit_h_m10_stabRankP_le_eighteen in LeanProofs.QubitHM10StabRank proves stabRankP 2 |qubit_H>^10 <= 18 against IsStabP 2 from this witness, the pointwise identity being decided by the kernel on integer coordinate vectors (see lean_proofs/LeanProofs/Stabilizer/Reflect.lean).",
  "lean": {
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    "theorem": "qubit_h_m10_stabRankP_le_eighteen"
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            0,
            0,
            0,
            0
          ],
          [
            0,
            0,
            1,
            1,
            1,
            1,
            1
          ],
          [
            0,
            0,
            0,
            0,
            0,
            0,
            0
          ],
          [
            0,
            0,
            0,
            0,
            0,
            0,
            0
          ],
          [
            0,
            0,
            0,
            0,
            0,
            0,
            0
          ],
          [
            0,
            0,
            0,
            0,
            0,
            0,
            0
          ],
          [
            0,
            0,
            0,
            0,
            0,
            0,
            0
          ]
        ],
        "l": [
          0,
          0,
          0,
          0,
          0,
          0,
          0
        ]
      },
      {
        "k": 3,
        "x0": [
          0,
          0,
          0,
          0,
          0,
          0,
          0,
          0,
          0,
          0
        ],
        "W": [
          [
            1,
            0,
            0,
            0,
            0,
            0,
            0,
            0,
            0,
            0
          ],
          [
            0,
            1,
            1,
            1,
            1,
            0,
            0,
            0,
            0,
            0
          ],
          [
            0,
            0,
            0,
            0,
            0,
            1,
            1,
            1,
            1,
            1
          ]
        ],
        "Q": [
          [
            0,
            1,
            0
          ],
          [
            0,
            0,
            1
          ],
          [
            0,
            0,
            0
          ]
        ],
        "l": [
          0,
          2,
          2
        ]
      }
    ],
    "coeffs": [
      "-sqrt(2)/8",
      "-1/4",
      "1/4",
      "-1/4",
      "-sqrt(2)/4",
      "sqrt(2)/4",
      "1/4",
      "sqrt(2)/4",
      "sqrt(2)/4",
      "-sqrt(2)/8",
      "-1/4",
      "1/4",
      "-1/4",
      "sqrt(2)/4",
      "sqrt(2)/4",
      "1/4",
      "sqrt(2)/4",
      "sqrt(2)/4"
    ]
  }
}