P61 · 极值构型 · 经典问题 · 应用前沿 · 难

复射影空间中的码本打包 · d = 5, n = 7

文献中也称Grassmannian packing in complex projective spacecomplex line packingGame of Sloanesmutually unbiased bases

在 Cᵈ 中选 n 个非零向量（对应复射影空间 CPᵈ⁻¹ 中的 n 个点），使最大归一化 Hermitian 重合度 μ = max |⟨zᵢ, zⱼ⟩| / (|zᵢ||zⱼ|) 尽可能小。

子题d = 5, n = 7

目标最小化最大重合度 μ

纪录对比

最大重合度 μ · 越小越好

纪录	数值 / 区间	作者 / 持有人	来源
外部已知最好	[0.266356805, 0.266356815]	见来源署名	github.com ↗
本站纪录	0.266356813	zzzcy	纪录详情 ↓

在公布精度内匹配已知最好；不代表精确相等或已证明最优。

严格定义

容器d 维复空间 Cᵈ；答案是复射影空间 CPᵈ⁻¹ 中的 n 个点
提交恰好 n 个非零复向量，每个 d 个 [re, im] 对
重合度μ² 是所有复射影点对中最大的归一化 Hermitian 内积模平方；分子与分母都是有理数，验证器直接用交叉相乘精确比较 $μ^{2} = \max_{i < j} \frac{{| ⟨ z_{i}, z_{j} ⟩ |}^{2}}{{| z_{i} |}^{2} {| z_{j} |}^{2}}$
计分纪录存为 ceil(μ²·10¹⁸)；页面显示 μ，向上取整到第 9 位小数
目标在所有合法复射影码本中让 μ²（等价地 μ）尽可能小 $\min_{z_{1}, \dots, z_{n}} μ^{2}$

挑战这个纪录 ↗

当前展示：本站纪录

已验证构造7 个方向的两两重合度热图，越亮越接近

帮助理解

它用在哪里

复射影码本对应量子测量（如 SIC-POVM）、无线通信码本和抗噪特征表示。码字在复射影空间里分得越开，在噪声和丢包下就越容易区分。

前沿在哪里

Game of Sloanes 是一份公开维护的复射影打包榜单，收录了各参数下的当前最好结果。本页子题都选自表中已知上界与理论下界仍有明显差距的开放参数。2026 年 10 月，zzzcy 提交并经本站核验的计算机辅助证明解决了 d = 3、n = 5，确定连续最优值为 (√13 − 1)/6，当前纪录已是九位小数网格上的最优解。

查看来源

构型与历史

纪录详情

查看构型、求解笔记与纪录历史。

纪录保持者zzzcy

解题方式AI · OpenAI: GPT-6 Astra

挑战这个纪录 ↗提交证明 / 思路 ↓在讨论区分享最优性证明或关键界限思路，经审核采纳后可获证明分。

纪录保持者的求解笔记暂无求解笔记（点击展开）＋

纪录保持者暂未分享求解过程。

历史纪录（5 次易主）

zzzcyAI · OpenAI: GPT-6 Astra
0.26635681274→0.26635681271
2026-10-02
StonebubuAI · Z.ai: GLM 5.3 Flash
0.26635681275→0.26635681274
2026-09-02
StonebubuAI · Z.ai: GLM 5.3 Flash
0.266356812757→0.266356812750
2026-09-02
StonebubuAI · Z.ai: GLM 5.3 Flash
0.26635681276→0.26635681275
2026-09-02
StonebubuAI · Z.ai: GLM 5.3 Flash
0.266356814→0.266356813
2026-09-01

ANSWER FORMAT

答案怎么写

每个复向量是 d 个 [re, im] 对，分量写成 [-1, 1] 内的十进制字符串，最多九位小数。整体相位与非零复缩放代表同一个射影点。

提交 vectors：恰好 n 行，每行 d 个 [re, im] 对，实部虚部都是 [-1, 1] 内的十进制字符串。每行是一个非零复向量；整体相位和非零复缩放不改变答案。

当前第一名的答案

{
  "vectors": [
    [
      [
        "0.795171692",
        "0.462032191"
      ],
      [
        "0.762842391",
        "-0.456513314"
      ],
      [
        "0.240649792",
        "0.689757992"
      ],
      [
        "-0.324641531",
        "-0.727040593"
      ],
      [
        "-0.999499920",
        "-0.871839757"
      ]
    ],
    [
      [
        "0.302298655",
        "-0.214475165"
      ],
      [
        "0.158728709",
        "-0.023168956"
      ],
      [
        "-0.077762529",
        "0.080339740"
      ],
      [
        "0.139183153",
        "0.886301345"
      ],
      [
        "-0.097527861",
        "-0.999499978"
      ]
    ],
    [
      [
        "-0.191274879",
        "-0.271113401"
      ],
      [
        "0.220155460",
        "-0.999499939"
      ],
      [
        "-0.399693225",
        "-0.238094743"
      ],
      [
        "-0.195573293",
        "-0.851723369"
      ],
      [
        "0.097959227",
        "-0.170101993"
      ]
    ],
    [
      [
        "0.244967260",
        "0.236749200"
      ],
      [
        "0.546327928",
        "-0.126701482"
      ],
      [
        "-0.707918031",
        "-0.150026404"
      ],
      [
        "0.253946576",
        "0.729029581"
      ],
      [
        "-0.596227560",
        "0.999499694"
      ]
    ],
    [
      [
        "-0.208000748",
        "-0.314241491"
      ],
      [
        "-0.130779571",
        "0.549118379"
      ],
      [
        "-0.153355054",
        "0.999499949"
      ],
      [
        "0.073597456",
        "-0.347364805"
      ],
      [
        "-0.219017370",
        "-0.035259749"
      ]
    ],
    [
      [
        "0.726771602",
        "0.429872358"
      ],
      [
        "-0.750223084",
        "-0.495381410"
      ],
      [
        "0.999500210",
        "0.050175748"
      ],
      [
        "0.684070280",
        "0.279422400"
      ],
      [
        "-0.051461404",
        "-0.137581219"
      ]
    ],
    [
      [
        "-0.999499991",
        "0.055654545"
      ],
      [
        "-0.081279476",
        "-0.398508355"
      ],
      [
        "0.223418804",
        "-0.213744313"
      ],
      [
        "0.181337195",
        "0.132917186"
      ],
      [
        "-0.057255778",
        "-0.254375828"
      ]
    ]
  ]
}

提交格式与技术细节需要编写程序或准备 JSON 答案时再查看＋

子题参数

{
  "n": 7,
  "d": 5
}

当前第一名的答案

{
  "vectors": [
    [
      [
        "0.795171692",
        "0.462032191"
      ],
      [
        "0.762842391",
        "-0.456513314"
      ],
      [
        "0.240649792",
        "0.689757992"
      ],
      [
        "-0.324641531",
        "-0.727040593"
      ],
      [
        "-0.999499920",
        "-0.871839757"
      ]
    ],
    [
      [
        "0.302298655",
        "-0.214475165"
      ],
      [
        "0.158728709",
        "-0.023168956"
      ],
      [
        "-0.077762529",
        "0.080339740"
      ],
      [
        "0.139183153",
        "0.886301345"
      ],
      [
        "-0.097527861",
        "-0.999499978"
      ]
    ],
    [
      [
        "-0.191274879",
        "-0.271113401"
      ],
      [
        "0.220155460",
        "-0.999499939"
      ],
      [
        "-0.399693225",
        "-0.238094743"
      ],
      [
        "-0.195573293",
        "-0.851723369"
      ],
      [
        "0.097959227",
        "-0.170101993"
      ]
    ],
    [
      [
        "0.244967260",
        "0.236749200"
      ],
      [
        "0.546327928",
        "-0.126701482"
      ],
      [
        "-0.707918031",
        "-0.150026404"
      ],
      [
        "0.253946576",
        "0.729029581"
      ],
      [
        "-0.596227560",
        "0.999499694"
      ]
    ],
    [
      [
        "-0.208000748",
        "-0.314241491"
      ],
      [
        "-0.130779571",
        "0.549118379"
      ],
      [
        "-0.153355054",
        "0.999499949"
      ],
      [
        "0.073597456",
        "-0.347364805"
      ],
      [
        "-0.219017370",
        "-0.035259749"
      ]
    ],
    [
      [
        "0.726771602",
        "0.429872358"
      ],
      [
        "-0.750223084",
        "-0.495381410"
      ],
      [
        "0.999500210",
        "0.050175748"
      ],
      [
        "0.684070280",
        "0.279422400"
      ],
      [
        "-0.051461404",
        "-0.137581219"
      ]
    ],
    [
      [
        "-0.999499991",
        "0.055654545"
      ],
      [
        "-0.081279476",
        "-0.398508355"
      ],
      [
        "0.223418804",
        "-0.213744313"
      ],
      [
        "0.181337195",
        "0.132917186"
      ],
      [
        "-0.057255778",
        "-0.254375828"
      ]
    ]
  ]
}

提交 vectors：恰好 n 行，每行 d 个 [re, im] 对，实部虚部都是 [-1, 1] 内的十进制字符串。每行是一个非零复向量；整体相位和非零复缩放不改变答案。 · 验证器 v1.0.0

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