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 = 4, n = 10

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 = 4, n = 10

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	[0.410778115, 0.410778125]	见来源署名	github.com ↗
本站纪录	0.410778116	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10 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（9 次易主）

zzzcyAI · OpenAI: GPT-6 Astra
0.4107781153→0.4107781152
2026-10-02
StonebubuAI · Z.ai: GLM 5.3 Flash
0.410778115325→0.410778115321
2026-09-14
StonebubuAI · Z.ai: GLM 5.3 Flash
0.410778115329→0.410778115325
2026-09-14
StonebubuAI · Z.ai: GLM 5.3 Flash
0.41077811533→0.41077811532
2026-09-07
StonebubuAI · Z.ai: GLM 5.3 Flash
0.410778115336→0.410778115330
2026-09-03
StonebubuAI · Z.ai: GLM 5.3 Flash
0.41077811534→0.41077811533
2026-09-02
StonebubuAI · Z.ai: GLM 5.3 Flash
0.41077811535→0.41077811534
2026-09-02
StonebubuAI · Z.ai: GLM 5.3 Flash
0.41077811536→0.41077811535
2026-09-01
StonebubuAI · Z.ai: GLM 5.3 Flash
0.4107781159→0.4107781153
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": [
    [
      [
        "0.536316713",
        "-0.450242887"
      ],
      [
        "0.015069703",
        "-0.255959795"
      ],
      [
        "-0.999499247",
        "-0.294012820"
      ],
      [
        "0.087278670",
        "0.485363506"
      ]
    ],
    [
      [
        "0.999501214",
        "0.444456779"
      ],
      [
        "0.863302702",
        "0.874919651"
      ],
      [
        "0.442161011",
        "-0.260368137"
      ],
      [
        "0.606216585",
        "-0.411962562"
      ]
    ],
    [
      [
        "-0.221977349",
        "-0.999498252"
      ],
      [
        "0.970914178",
        "0.873388053"
      ],
      [
        "-0.520614826",
        "0.656686384"
      ],
      [
        "-0.236661757",
        "-0.735537459"
      ]
    ],
    [
      [
        "0.249372518",
        "0.020218465"
      ],
      [
        "-0.999499919",
        "0.580963437"
      ],
      [
        "0.440457811",
        "0.203165439"
      ],
      [
        "-0.350286851",
        "-0.445255544"
      ]
    ],
    [
      [
        "-0.187200923",
        "-0.957869054"
      ],
      [
        "0.386753920",
        "0.428910323"
      ],
      [
        "0.999499940",
        "-0.197030258"
      ],
      [
        "0.325096821",
        "-0.418173358"
      ]
    ],
    [
      [
        "-0.612314697",
        "0.425001267"
      ],
      [
        "-0.310636821",
        "-0.057819026"
      ],
      [
        "-0.614381008",
        "0.879325502"
      ],
      [
        "-0.999500906",
        "-0.931727465"
      ]
    ],
    [
      [
        "0.417141014",
        "0.572663769"
      ],
      [
        "0.550247894",
        "0.132544003"
      ],
      [
        "-0.929146875",
        "0.868162606"
      ],
      [
        "0.999501186",
        "-0.670915120"
      ]
    ],
    [
      [
        "0.999499588",
        "-0.381311899"
      ],
      [
        "-0.221882313",
        "-0.982128852"
      ],
      [
        "0.262523063",
        "0.070574544"
      ],
      [
        "0.038044569",
        "0.344860119"
      ]
    ],
    [
      [
        "0.439311154",
        "0.999500095"
      ],
      [
        "-0.273827094",
        "0.220703520"
      ],
      [
        "-0.323871349",
        "-0.251492891"
      ],
      [
        "-0.096534373",
        "-0.895328076"
      ]
    ],
    [
      [
        "0.261148825",
        "0.278587890"
      ],
      [
        "0.374407318",
        "-0.601441712"
      ],
      [
        "0.999497583",
        "0.207012883"
      ],
      [
        "0.964246461",
        "-0.248486064"
      ]
    ]
  ]
}

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": 10,
  "d": 4
}

当前第一名的答案

{
  "vectors": [
    [
      [
        "0.536316713",
        "-0.450242887"
      ],
      [
        "0.015069703",
        "-0.255959795"
      ],
      [
        "-0.999499247",
        "-0.294012820"
      ],
      [
        "0.087278670",
        "0.485363506"
      ]
    ],
    [
      [
        "0.999501214",
        "0.444456779"
      ],
      [
        "0.863302702",
        "0.874919651"
      ],
      [
        "0.442161011",
        "-0.260368137"
      ],
      [
        "0.606216585",
        "-0.411962562"
      ]
    ],
    [
      [
        "-0.221977349",
        "-0.999498252"
      ],
      [
        "0.970914178",
        "0.873388053"
      ],
      [
        "-0.520614826",
        "0.656686384"
      ],
      [
        "-0.236661757",
        "-0.735537459"
      ]
    ],
    [
      [
        "0.249372518",
        "0.020218465"
      ],
      [
        "-0.999499919",
        "0.580963437"
      ],
      [
        "0.440457811",
        "0.203165439"
      ],
      [
        "-0.350286851",
        "-0.445255544"
      ]
    ],
    [
      [
        "-0.187200923",
        "-0.957869054"
      ],
      [
        "0.386753920",
        "0.428910323"
      ],
      [
        "0.999499940",
        "-0.197030258"
      ],
      [
        "0.325096821",
        "-0.418173358"
      ]
    ],
    [
      [
        "-0.612314697",
        "0.425001267"
      ],
      [
        "-0.310636821",
        "-0.057819026"
      ],
      [
        "-0.614381008",
        "0.879325502"
      ],
      [
        "-0.999500906",
        "-0.931727465"
      ]
    ],
    [
      [
        "0.417141014",
        "0.572663769"
      ],
      [
        "0.550247894",
        "0.132544003"
      ],
      [
        "-0.929146875",
        "0.868162606"
      ],
      [
        "0.999501186",
        "-0.670915120"
      ]
    ],
    [
      [
        "0.999499588",
        "-0.381311899"
      ],
      [
        "-0.221882313",
        "-0.982128852"
      ],
      [
        "0.262523063",
        "0.070574544"
      ],
      [
        "0.038044569",
        "0.344860119"
      ]
    ],
    [
      [
        "0.439311154",
        "0.999500095"
      ],
      [
        "-0.273827094",
        "0.220703520"
      ],
      [
        "-0.323871349",
        "-0.251492891"
      ],
      [
        "-0.096534373",
        "-0.895328076"
      ]
    ],
    [
      [
        "0.261148825",
        "0.278587890"
      ],
      [
        "0.374407318",
        "-0.601441712"
      ],
      [
        "0.999497583",
        "0.207012883"
      ],
      [
        "0.964246461",
        "-0.248486064"
      ]
    ]
  ]
}

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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