{"id":1655,"date":"2026-10-28T13:00:00","date_gmt":"2026-10-28T04:00:00","guid":{"rendered":"https:\/\/quantumsea.net\/?p=1655"},"modified":"2026-10-25T13:22:50","modified_gmt":"2026-10-25T04:22:50","slug":"qs-bb84-intercept-resend-20261025","status":"publish","type":"post","link":"https:\/\/quantumsea.net\/?p=1655","title":{"rendered":"BB84\u3001\u6e2c\u3063\u3066\u9001\u308a\u76f4\u3059\u76d7\u8074\u3067\u8aa4\u308a\u304c25%\u306b\u306a\u308b\u6761\u4ef6"},"content":{"rendered":"<p>\u9001\u308a\u624b\u3068\u53d7\u3051\u624b\u304c\u540c\u3058\u3084\u308a\u65b9\u3067\u6e2c\u308c\u3070\u3001\u540c\u30580\u30681\u304c\u305d\u308d\u3046\u306f\u305a\u306e\u901a\u4fe1\u304c\u3042\u308a\u307e\u3059\u3002\u3068\u3053\u308d\u304c\u3001\u9014\u4e2d\u306e\u8ab0\u304b\u304c\u4fe1\u53f7\u3092\u6e2c\u308a\u3001\u305d\u306e\u7d50\u679c\u3092\u4f7f\u3063\u3066\u9001\u308a\u76f4\u3059\u3068\u3001\u5024\u304c\u98df\u3044\u9055\u3044\u59cb\u3081\u307e\u3059\u3002\u91cf\u5b50\u9375\u914d\u9001\u306eBB84\u306f\u3001\u3053\u3046\u3057\u305f\u6e2c\u5b9a\u306e\u5f71\u97ff\u3092\u624b\u304c\u304b\u308a\u306b\u3001\u79d8\u5bc6\u306e\u9375\u3092\u5171\u6709\u3059\u308b\u4ed5\u7d44\u307f\u3067\u3059\u3002<\/p>\n<p>\u3088\u304f\u767b\u5834\u3059\u308b\u300c\u76d7\u8074\u3059\u308b\u3068\u8aa4\u308a\u738725%\u300d\u3068\u3044\u3046\u6570\u5b57\u306b\u306f\u3001\u6761\u4ef6\u304c\u3042\u308a\u307e\u3059\u3002\u3053\u3053\u3067\u306f\u7406\u60f3\u7684\u306a1\u91cf\u5b50\u30d3\u30c3\u30c8\u3092\u4f7f\u3044\u3001\u76d7\u8074\u8005\u304c<strong>\u3059\u3079\u3066\u306e\u4fe1\u53f7\u3092\u4e8c\u3064\u306e\u57fa\u5e95\u304b\u3089\u30e9\u30f3\u30c0\u30e0\u306b\u9078\u3093\u3067\u6e2c\u5b9a\u3057\u3001\u6e2c\u3063\u305f\u72b6\u614b\u3092\u9001\u308a\u76f4\u3059<\/strong>\u5834\u5408\u3092\u8a08\u7b97\u3057\u307e\u3059\u3002\u3053\u306e\u65b9\u6cd5\u3092\u3001\u508d\u53d7\u3057\u3066\u518d\u9001\u3059\u308b\u3053\u3068\u304b\u3089intercept-resend\u3068\u547c\u3073\u307e\u3059\u3002\u901a\u4fe1\u306e\u96d1\u97f3\u3084\u640d\u5931\u306f\u306a\u3044\u3082\u306e\u3068\u3057\u307e\u3059\u3002<\/p>\n<section class=\"influvetor-quick-summary\" aria-label=\"\u7c21\u5358\u306b\u307e\u3068\u3081\u308b\u3068\uff1f\">\n<p><strong>\u7c21\u5358\u306b\u307e\u3068\u3081\u308b\u3068\uff1f<\/strong><\/p>\n<ul>\n<li>BB84\u3067\u306f\u3001\u4e8c\u901a\u308a\u306e\u6e2c\u308a\u65b9\u3067\u3042\u308b\u57fa\u5e95\u3092\u4f7f\u3044\u307e\u3059\u3002\u9001\u53d7\u4fe1\u8005\u304c\u540c\u3058\u57fa\u5e95\u3092\u9078\u3093\u3060\u30c7\u30fc\u30bf\u3060\u3051\u3092\u6b8b\u3059\u300c\u3075\u308b\u3044\u5206\u3051\u300d\u304c\u3001\u8aa4\u308a\u7387\u306e\u5206\u6bcd\u3092\u6c7a\u3081\u307e\u3059\u3002<\/li>\n<li>\u5168\u4fe1\u53f7\u306b\u5bfe\u3059\u308b\u7406\u60f3\u7684\u306aintercept-resend\u3067\u306f\u3001\u76d7\u8074\u8005\u306e\u57fa\u5e95\u304c\u5916\u308c\u308b\u78ba\u73871\/2\u3068\u3001\u305d\u3053\u304b\u3089\u53d7\u4fe1\u5024\u304c\u5909\u308f\u308b\u78ba\u73871\/2\u304c\u639b\u3051\u5408\u308f\u3055\u308c\u3001\u6b8b\u3057\u305f\u30c7\u30fc\u30bf\u306e\u8aa4\u308a\u7387\u306f25%\u306b\u306a\u308a\u307e\u3059\u3002<\/li>\n<li>25%\u306f\u3053\u306e\u653b\u6483\u30e2\u30c7\u30eb\u3067\u306e\u78ba\u7387\u3067\u3059\u3002\u5c0f\u3055\u306a\u6a19\u672c\u3067\u306f\u98df\u3044\u9055\u3044\u3092\u898b\u9003\u3059\u5834\u5408\u304c\u3042\u308a\u300125%\u672a\u6e80\u306a\u3089\u5b89\u5168\u3068\u3044\u3046\u57fa\u6e96\u306b\u3082\u306a\u308a\u307e\u305b\u3093\u3002<\/li>\n<\/ul>\n<\/section>\n<h2>\u540c\u30580\u3092\u3001\u4e8c\u901a\u308a\u306e\u57fa\u5e95\u306b\u8f09\u305b\u308b<\/h2>\n<p>\u57fa\u5e95\u306f\u3001\u3069\u306e\u4e00\u7d44\u306e\u72b6\u614b\u30920\u30681\u3068\u3057\u3066\u533a\u5225\u3059\u308b\u304b\u3092\u6c7a\u3081\u308b\u3082\u306e\u3067\u3059\u3002\u3053\u3053\u3067\u306fZ\u57fa\u5e95\u306e|0\u3009\u3001|1\u3009\u3068\u3001X\u57fa\u5e95\u306e|+\u3009\u3001|\u2212\u3009\u3092\u4f7f\u3044\u307e\u3059\u3002\u5f8c\u8005\u306f\u3001|+\u3009\uff1d(|0\u3009\uff0b|1\u3009)\/\u221a2\u3001|\u2212\u3009\uff1d(|0\u3009\u2212|1\u3009)\/\u221a2\u3068\u3044\u3046\u91cd\u306d\u5408\u308f\u305b\u3067\u3059\u3002\u3069\u3061\u3089\u306e\u57fa\u5e95\u3067\u3082\u6700\u521d\u306e\u72b6\u614b\u3092\u30d3\u30c3\u30c80\u3001\u4e8c\u756a\u76ee\u3092\u30d3\u30c3\u30c81\u306b\u5bfe\u5fdc\u3055\u305b\u307e\u3059\u3002<\/p>\n<p>\u9001\u308a\u624b\u30a2\u30ea\u30b9\u306f\u3001\u30d3\u30c3\u30c8\u3068\u57fa\u5e95\u3092\u305d\u308c\u305e\u308c\u540c\u3058\u78ba\u7387\u3067\u9078\u3073\u307e\u3059\u3002\u53d7\u3051\u624b\u30dc\u30d6\u3082\u3001\u30a2\u30ea\u30b9\u306e\u57fa\u5e95\u3092\u77e5\u3089\u306a\u3044\u307e\u307eZ\u304bX\u3092\u9078\u3093\u3067\u6e2c\u308a\u307e\u3059\u3002\u540c\u3058\u57fa\u5e95\u306a\u3089\u5143\u306e\u30d3\u30c3\u30c8\u3092\u78ba\u5b9f\u306b\u5f97\u3089\u308c\u307e\u3059\u3002\u9055\u3046\u57fa\u5e95\u306a\u3089\u30010\u30681\u304c\u534a\u3005\u3067\u3059\u3002\u539f\u8ad6\u6587\u306f\u3053\u308c\u3092\u5358\u4e00\u5149\u5b50\u306e\u504f\u5149\u3067\u793a\u3057\u3066\u3044\u307e\u3059\u3002[1]<\/p>\n<p>\u4f8b\u3048\u3070\u30a2\u30ea\u30b9\u304cZ\u57fa\u5e95\u306e0\u3001\u3064\u307e\u308a|0\u3009\u3092\u9001\u3063\u305f\u3068\u3057\u307e\u3057\u3087\u3046\u3002\u30dc\u30d6\u304cZ\u3067\u6e2c\u308c\u30700\u3067\u3059\u3002\u3057\u304b\u3057X\u3067\u6e2c\u308b\u3068\u3001|+\u3009\u5074\u3068|\u2212\u3009\u5074\u306b\u7b49\u3057\u3044\u5927\u304d\u3055\u306e\u6210\u5206\u304c\u3042\u308b\u305f\u3081\u3001\u7d50\u679c\u306f\u534a\u3005\u306b\u306a\u308a\u307e\u3059\u3002\u30dc\u30d6\u304c\u4e01\u5be7\u306b\u6e2c\u308a\u3055\u3048\u3059\u308c\u3070\u5143\u306e0\u3092\u8aad\u3081\u308b\u3001\u3068\u3044\u3046\u7a2e\u985e\u306e\u9055\u3044\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u3002<\/p>\n<h2>25%\u3092\u6570\u3048\u308b\u306e\u306f\u3001\u57fa\u5e95\u304c\u305d\u308d\u3063\u305f\u5f8c<\/h2>\n<p>\u53d7\u4fe1\u304c\u7d42\u308f\u3063\u3066\u304b\u3089\u3001\u30a2\u30ea\u30b9\u3068\u30dc\u30d6\u306f\u4f7f\u3063\u305f\u57fa\u5e95\u3092\u516c\u958b\u3057\u3066\u7167\u5408\u3057\u3001\u540c\u3058\u57fa\u5e95\u3060\u3063\u305f\u4f4d\u7f6e\u3060\u3051\u3092\u6b8b\u3057\u307e\u3059\u3002\u3053\u308c\u304c<strong>\u3075\u308b\u3044\u5206\u3051\uff08sifting\uff09<\/strong>\u3067\u3059\u3002\u4e8c\u4eba\u304c\u72ec\u7acb\u306bZ\u30fbX\u3092\u534a\u3005\u3067\u9078\u3076\u4eca\u56de\u306e\u6761\u4ef6\u3067\u306f\u3001\u6b8b\u308b\u5272\u5408\u306e\u671f\u5f85\u5024\u306f\u5168\u4f53\u306e1\/2\u3067\u3059\u3002\u3053\u306e\u6bb5\u968e\u3067\u3001\u6b8b\u3059\u30d3\u30c3\u30c8\u306e\u5024\u3092\u3059\u3079\u3066\u516c\u958b\u3059\u308b\u308f\u3051\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u3002[1]<\/p>\n<p>\u4ee5\u5f8c\u306e\u8aa4\u308a\u7387\u3001QBER\uff08quantum bit error rate\uff09\u306f\u3001\u3075\u308b\u3044\u5206\u3051\u5f8c\u306e\u30c7\u30fc\u30bf\u306b\u3064\u3044\u3066\u3001\u30a2\u30ea\u30b9\u3068\u30dc\u30d6\u306e\u5024\u304c\u7570\u306a\u308b\u5272\u5408\u3092\u6307\u3057\u307e\u3059\u3002\u57fa\u5e95\u304c\u9055\u3063\u3066\u6368\u3066\u305f\u30c7\u30fc\u30bf\u306f\u3001\u5206\u6bcd\u306b\u3082\u98df\u3044\u9055\u3044\u306e\u6570\u306b\u3082\u5165\u308a\u307e\u305b\u3093\u3002<\/p>\n<p>\u3053\u306e\u5206\u6bcd\u306e\u533a\u5225\u306f\u6570\u5b57\u3092\u8aad\u3080\u3046\u3048\u3067\u5927\u5207\u3067\u3059\u3002\u4f8b\u3048\u30701,000\u500b\u3092\u9001\u3063\u305f\u7406\u60f3\u7684\u306a\u8a08\u7b97\u306a\u3089\u3001\u5e73\u5747\u3067500\u500b\u304c\u6b8b\u308a\u3001\u305d\u306e\u4e2d\u306e125\u500b\u304c\u98df\u3044\u9055\u3046\u306825%\u3067\u3059\u3002125\u500b\u3092\u9001\u4fe1\u7dcf\u65701,000\u500b\u3067\u5272\u3063\u305f12.5%\u3068\u306f\u3001\u6570\u3048\u3066\u3044\u308b\u5bfe\u8c61\u304c\u7570\u306a\u308a\u307e\u3059\u3002500\u500b\u3084125\u500b\u306f\u671f\u5f85\u5024\u3067\u3001\u6bce\u56de\u305d\u306e\u500b\u6570\u306b\u306a\u308b\u3068\u3044\u3046\u4e88\u6e2c\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u3002<\/p>\n<h2>\u76d7\u8074\u8005\u306e\u57fa\u5e95\u304c\u5916\u308c\u308b\u3068\u3001\u534a\u5206\u306e\u78ba\u7387\u3067\u98df\u3044\u9055\u3046<\/h2>\n<p>\u76d7\u8074\u8005\u30a4\u30d6\u306f\u3001\u30a2\u30ea\u30b9\u306e\u57fa\u5e95\u304c\u767a\u8868\u3055\u308c\u308b\u524d\u306bZ\u304bX\u3092\u534a\u3005\u3067\u9078\u3093\u3067\u6e2c\u5b9a\u3057\u3001\u5f97\u305f\u72b6\u614b\u3092\u30dc\u30d6\u3078\u9001\u308a\u76f4\u3057\u307e\u3059\u3002\u3075\u308b\u3044\u5206\u3051\u5f8c\u3060\u3051\u306b\u6ce8\u76ee\u3059\u308b\u3068\u3001\u30dc\u30d6\u306e\u57fa\u5e95\u306f\u30a2\u30ea\u30b9\u3068\u540c\u3058\u3067\u3059\u3002\u305d\u3053\u3067\u3001\u30a4\u30d6\u306e\u57fa\u5e95\u304c\u30a2\u30ea\u30b9\u3068\u540c\u3058\u5834\u5408\u3068\u3001\u9055\u3046\u5834\u5408\u306b\u5206\u3051\u3089\u308c\u307e\u3059\u3002<\/p>\n<p><strong>\u540c\u3058\u57fa\u5e95\u3092\u9078\u3076\u78ba\u7387\u306f1\/2<\/strong>\u3067\u3059\u3002\u3053\u306e\u5834\u5408\u3001\u30a4\u30d6\u306f\u5143\u306e\u30d3\u30c3\u30c8\u3092\u6b63\u3057\u304f\u8aad\u307f\u3001\u305d\u306e\u72b6\u614b\u3092\u9001\u308a\u307e\u3059\u3002\u30dc\u30d6\u3082\u540c\u3058\u57fa\u5e95\u306a\u306e\u3067\u5143\u306e\u30d3\u30c3\u30c8\u304c\u5f97\u3089\u308c\u3001\u4eca\u56de\u306e\u7406\u60f3\u6761\u4ef6\u3067\u306f\u98df\u3044\u9055\u3044\u307e\u305b\u3093\u3002<\/p>\n<p><strong>\u9055\u3046\u57fa\u5e95\u3092\u9078\u3076\u78ba\u7387\u30821\/2<\/strong>\u3067\u3059\u3002\u5148\u307b\u3069\u306e|0\u3009\u3092\u3001\u30a4\u30d6\u304cX\u3067\u6e2c\u308b\u4f8b\u3092\u8003\u3048\u307e\u3059\u3002\u30a4\u30d6\u306e\u7d50\u679c\u306f|+\u3009\u304b|\u2212\u3009\u306b\u306a\u308a\u3001\u305d\u306e\u3069\u3061\u3089\u3092\u30dc\u30d6\u3078\u9001\u3063\u3066\u3082\u3001Z\u3067\u6e2c\u308b\u30dc\u30d6\u306e\u7d50\u679c\u306f0\u30681\u304c\u534a\u3005\u3067\u3059\u3002\u5143\u306f0\u3060\u3063\u305f\u306e\u3067\u3001\u534a\u5206\u304c\u98df\u3044\u9055\u3044\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<p>\u3057\u305f\u304c\u3063\u3066\u3001\u3075\u308b\u3044\u5206\u3051\u5f8c\u306e\u8aa4\u308a\u78ba\u7387\u306f<strong>(1\/2)\u00d70\uff0b(1\/2)\u00d7(1\/2)\uff1d1\/4<\/strong>\u3067\u3059\u3002\u540c\u3058\u8b70\u8ad6\u306f\u3001\u30a2\u30ea\u30b9\u304c|1\u3009\u3001|+\u3009\u3001|\u2212\u3009\u3092\u9001\u308b\u5834\u5408\u306b\u3082\u6210\u308a\u7acb\u3061\u307e\u3059\u3002\u672c\u7a3f\u3067\u306f\u56db\u72b6\u614b\u305d\u308c\u305e\u308c\u306b\u3064\u3044\u3066\u5c04\u5f71\u6e2c\u5b9a\u306e\u78ba\u7387\u3092\u5217\u6319\u3057\u3001\u3069\u306e\u5165\u529b\u3067\u30821\/4\u306b\u306a\u308b\u3053\u3068\u3092\u72ec\u81ea\u8a08\u7b97\u3067\u78ba\u304b\u3081\u307e\u3057\u305f\u3002\u5b9f\u6a5f\u306e\u6e2c\u5b9a\u5024\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u3002<\/p>\n<figure style=\"margin:24px auto;width:100%;max-width:720px;\"><img decoding=\"async\" src=\"https:\/\/quantumsea.net\/wp-content\/uploads\/2026\/10\/qs-bb84-intercept-resend-20261025-figure-01a754805df7.png\" style=\"display:block;width:100%;max-width:100%;height:auto;\" alt=\"\u9001\u53d7\u4fe1\u8005\u306e\u57fa\u5e95\u304c\u4e00\u81f4\u3057\u305f\u30c7\u30fc\u30bf\u3060\u3051\u3092\u898b\u308b\u3002\u76d7\u8074\u8005\u306e\u57fa\u5e95\u304c\u4e00\u81f4\u3059\u308b\u534a\u5206\u3067\u306f\u8aa4\u308a0\u3001\u9055\u3046\u534a\u5206\u3067\u306f\u8aa4\u308a\u304c\u534a\u5206\u3002\u5168\u4f53\u306e\u8aa4\u308a\u78ba\u7387\u306f4\u5206\u306e1\u306b\u306a\u308b\u3002\"><figcaption>\u5168\u4fe1\u53f7\u3092\u508d\u53d7\u3057\u3066\u6e2c\u5b9a\u30fb\u518d\u9001\u3059\u308b\u7406\u60f3\u30e2\u30c7\u30eb\u306e\u72ec\u81ea\u8a08\u7b97\u3002\u4e0b\u306e\u68d2\u306f\u3001\u3075\u308b\u3044\u5206\u3051\u5f8c\u306e\u30c7\u30fc\u30bf\u306b\u5bfe\u3059\u308b\u78ba\u7387\u306e\u5185\u8a33\u3067\u3059\u3002\u76d7\u8074\u8005\u306e\u57fa\u5e95\u304c\u9055\u3063\u3066\u3082\u3001\u53d7\u4fe1\u5024\u304c\u5076\u7136\u4e00\u81f4\u3059\u308b\u5834\u5408\u304c\u3042\u308a\u307e\u3059\u3002<\/figcaption><\/figure>\n<p>\u300c\u6e2c\u3089\u308c\u305f\u4fe1\u53f7\u304c\u5fc5\u305a\u58ca\u308c\u308b\u300d\u308f\u3051\u3067\u306f\u306a\u3044\u3053\u3068\u3082\u3001\u3053\u306e\u5f0f\u304b\u3089\u5206\u304b\u308a\u307e\u3059\u3002\u30a4\u30d6\u306e\u57fa\u5e95\u304c\u5408\u3048\u3070\u98df\u3044\u9055\u3044\u307e\u305b\u3093\u3057\u3001\u5916\u308c\u3066\u3082\u30dc\u30d6\u306e\u5024\u304c\u5076\u7136\u5408\u3046\u5834\u5408\u304c\u3042\u308a\u307e\u3059\u3002\u6e2c\u5b9a\u306e\u5f71\u97ff\u306f\u3001\u4e00\u3064\u3072\u3068\u3064\u306e\u78ba\u5b9a\u7684\u306a\u8b66\u5831\u3067\u306f\u306a\u304f\u3001\u591a\u6570\u306e\u7d50\u679c\u306b\u73fe\u308c\u308b\u7d71\u8a08\u7684\u306a\u9055\u3044\u3067\u3059\u3002<\/p>\n<h2>\u691c\u67fb\u3057\u305f20\u30d3\u30c3\u30c8\u304c\u3001\u5168\u90e8\u4e00\u81f4\u3059\u308b\u3053\u3068\u3082\u3042\u308b<\/h2>\n<p>\u4e8c\u4eba\u306f\u6b8b\u3057\u305f\u30c7\u30fc\u30bf\u306e\u4e00\u90e8\u3092\u30e9\u30f3\u30c0\u30e0\u306b\u9078\u3073\u3001\u305d\u306e\u30d3\u30c3\u30c8\u5024\u3092\u516c\u958b\u3057\u3066\u6bd4\u8f03\u3057\u307e\u3059\u3002\u691c\u67fb\u306b\u4f7f\u3063\u3066\u516c\u958b\u3057\u305f\u30d3\u30c3\u30c8\u306f\u3001\u79d8\u5bc6\u306e\u9375\u304b\u3089\u9664\u304d\u307e\u3059\u3002[1\u20132] \u3053\u3053\u3067\u3082\u3001\u4eca\u56de\u306e\u653b\u6483\u304c\u6bce\u56de\u72ec\u7acb\u306b\u884c\u308f\u308c\u3001\u9078\u3093\u3060\u5404\u691c\u67fb\u30d3\u30c3\u30c8\u306e\u8aa4\u308a\u78ba\u7387\u304c1\/4\u3068\u3044\u3046\u6a21\u578b\u306b\u9650\u3063\u3066\u8003\u3048\u307e\u3059\u3002<\/p>\n<p>1\u30d3\u30c3\u30c8\u304c\u4e00\u81f4\u3059\u308b\u78ba\u7387\u306f3\/4\u306a\u306e\u3067\u3001m\u30d3\u30c3\u30c8\u3059\u3079\u3066\u304c\u4e00\u81f4\u3059\u308b\u78ba\u7387\u306f<strong>(3\/4)<sup>m<\/sup><\/strong>\u3067\u3059\u3002\u72ec\u81ea\u8a08\u7b97\u3067\u306f\u300110\u30d3\u30c3\u30c8\u306a\u3089\u7d045.63%\u300120\u30d3\u30c3\u30c8\u306a\u3089\u7d040.317%\u300140\u30d3\u30c3\u30c8\u306a\u3089\u7d040.00101%\u306b\u306a\u308a\u307e\u3059\u3002\u5168\u4fe1\u53f7\u304c\u653b\u6483\u3055\u308c\u3066\u3044\u3066\u3082\u3001\u5c11\u306a\u3044\u691c\u67fb\u3067\u306f\u4e00\u3064\u3082\u98df\u3044\u9055\u3044\u3092\u898b\u3064\u3051\u306a\u3044\u5834\u5408\u304c\u6b8b\u308a\u307e\u3059\u3002<\/p>\n<p>\u3053\u306e\u6570\u5b57\u306f\u3001\u300c\u5168\u4fe1\u53f7\u306b\u3053\u306e\u653b\u6483\u304c\u3042\u3063\u305f\u3068\u304d\u306b\u3001\u691c\u67fb\u304c\u5168\u90e8\u4e00\u81f4\u3059\u308b\u78ba\u7387\u300d\u3067\u3059\u3002\u5168\u90e8\u4e00\u81f4\u3057\u305f\u3068\u3044\u3046\u7d50\u679c\u304b\u3089\u3001\u305d\u306e\u307e\u307e\u300c\u76d7\u8074\u3055\u308c\u3066\u3044\u308b\u78ba\u7387\u306f0.317%\u300d\u3068\u9006\u5411\u304d\u306b\u8aad\u3080\u3053\u3068\u306f\u3067\u304d\u307e\u305b\u3093\u3002\u307e\u305f\u3001\u3053\u306e\u5f0f\u3060\u3051\u3067\u73fe\u5b9f\u306e\u9375\u306e\u5b89\u5168\u6027\u3084\u5fc5\u8981\u306a\u691c\u67fb\u6570\u3092\u6c7a\u3081\u308b\u3053\u3068\u3082\u3067\u304d\u307e\u305b\u3093\u3002\u653b\u6483\u306e\u7a2e\u985e\u3068\u8a66\u884c\u9593\u306e\u72ec\u7acb\u6027\u3092\u9650\u5b9a\u3057\u305f\u8a08\u7b97\u3060\u304b\u3089\u3067\u3059\u3002<\/p>\n<h2>\u653b\u6483\u3059\u308b\u5272\u5408\u3092\u6e1b\u3089\u305b\u3070\u300125%\u3088\u308a\u5c0f\u3055\u304f\u306a\u308b<\/h2>\n<p>\u3082\u3046\u4e00\u3064\u3001\u540c\u3058\u6a21\u578b\u306e\u4e2d\u3067\u6761\u4ef6\u3092\u5909\u3048\u3066\u307f\u307e\u3059\u3002\u30a4\u30d6\u304c\u5404\u4fe1\u53f7\u3092\u72ec\u7acb\u306b\u78ba\u7387f\u3067\u653b\u6483\u3057\u3001\u305d\u308c\u4ee5\u5916\u306f\u305d\u306e\u307e\u307e\u901a\u3059\u3068\u3057\u307e\u3059\u3002\u307b\u304b\u306b\u8aa4\u308a\u304c\u306a\u3044\u306a\u3089\u3001\u3075\u308b\u3044\u5206\u3051\u5f8c\u306e\u8aa4\u308a\u7387\u306f<strong>f\/4<\/strong>\u3067\u3059\u3002<\/p>\n<p>\u4f8b\u3048\u3070f\uff1d0.2\u3001\u3064\u307e\u308a\u5e73\u5747\u306720%\u306e\u4fe1\u53f7\u3092\u653b\u6483\u3059\u308b\u3068\u3001\u8aa4\u308a\u7387\u306f5%\u3067\u3059\u3002\u6b8b\u3057\u305f\u30c7\u30fc\u30bf\u306b\u3082\u653b\u6483\u3092\u53d7\u3051\u305f\u3082\u306e\u306f\u6df7\u3056\u3063\u3066\u3044\u307e\u3059\u304c\u300125%\u306b\u306f\u9054\u3057\u307e\u305b\u3093\u3002\u3053\u306e\u5c0f\u3055\u306a\u4f8b\u3060\u3051\u3067\u3082\u3001\u300c25%\u3092\u4e0b\u56de\u3063\u305f\u304b\u3089\u76d7\u8074\u306f\u306a\u3044\u300d\u3068\u5224\u5b9a\u3067\u304d\u306a\u3044\u3053\u3068\u304c\u5206\u304b\u308a\u307e\u3059\u3002<\/p>\n<p>\u9006\u306b\u3001\u89b3\u6e2c\u3057\u305f\u98df\u3044\u9055\u3044\u3092\u3059\u3079\u3066\u76d7\u8074\u306e\u8a3c\u62e0\u3068\u3059\u308b\u3053\u3068\u3082\u3067\u304d\u307e\u305b\u3093\u3002\u88c5\u7f6e\u306e\u6e96\u5099\u3084\u6e2c\u5b9a\u3001\u4f1d\u9001\u3067\u751f\u3058\u308b\u8aa4\u308a\u3082\u3042\u308a\u307e\u3059\u3002\u5b9f\u969b\u306e\u8a55\u4fa1\u306b\u306f\u3001\u3069\u306e\u88c5\u7f6e\u30fb\u4fe1\u53f7\u6e90\u3092\u4eee\u5b9a\u3057\u305f\u304b\u3001\u57fa\u5e95\u3054\u3068\u306b\u4f55\u500b\u691c\u67fb\u3057\u305f\u304b\u3001\u6a19\u672c\u306e\u3070\u3089\u3064\u304d\u3092\u3069\u3046\u898b\u8fbc\u3093\u3060\u304b\u304c\u5fc5\u8981\u3067\u3059\u3002<\/p>\n<h2>\u9375\u3092\u4f5c\u308b\u306b\u306f\u3001\u691c\u67fb\u306e\u5148\u304c\u3042\u308b<\/h2>\n<p>BB84\u306f\u3001\u79d8\u5bc6\u306e\u30e1\u30c3\u30bb\u30fc\u30b8\u672c\u6587\u3092\u305d\u306e\u307e\u307e\u91cf\u5b50\u72b6\u614b\u3067\u9001\u308b\u65b9\u5f0f\u3067\u306f\u306a\u304f\u3001\u5f8c\u3067\u4f7f\u3046\u9375\u3092\u5171\u6709\u3059\u308b\u305f\u3081\u306e\u65b9\u5f0f\u3067\u3059\u3002\u57fa\u5e95\u7167\u5408\u3084\u691c\u67fb\u306b\u4f7f\u3046\u53e4\u5178\u901a\u4fe1\u3067\u306f\u3001\u76f8\u624b\u304c\u8ab0\u3067\u3001\u5185\u5bb9\u304c\u6539\u3056\u3093\u3055\u308c\u3066\u3044\u306a\u3044\u304b\u3092\u8a8d\u8a3c\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002[1] \u901a\u4fe1\u8def\u3092\u91cf\u5b50\u5316\u3057\u305f\u3060\u3051\u3067\u3001\u3053\u306e\u78ba\u8a8d\u3092\u7701\u3051\u308b\u308f\u3051\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u3002<\/p>\n<p>\u3055\u3089\u306b\u3001\u691c\u67fb\u3092\u901a\u3063\u305f\u30d3\u30c3\u30c8\u5217\u3092\u305d\u306e\u307e\u307e\u5b8c\u6210\u3057\u305f\u9375\u3068\u3059\u308b\u306e\u3067\u306f\u306a\u304f\u3001\u4e8c\u4eba\u306e\u4e0d\u4e00\u81f4\u3092\u76f4\u3059\u8aa4\u308a\u8a02\u6b63\u3084\u3001\u7b2c\u4e09\u8005\u306b\u6b8b\u308a\u5f97\u308b\u60c5\u5831\u3092\u6291\u3048\u308b\u305f\u3081\u306b\u9375\u3092\u77ed\u304f\u3059\u308b\u51e6\u7406\u3092\u3001\u5b89\u5168\u6027\u306e\u8a55\u4fa1\u3068\u7d50\u3073\u307e\u3059\u3002Shor\u3068Preskill\u306e\u8ad6\u6587\u306f\u3001\u8aa4\u308a\u8a02\u6b63\u7b26\u53f7\u3068\u3082\u3064\u308c\u7cbe\u88fd\u3092\u901a\u3057\u3066BB84\u306e\u5b89\u5168\u6027\u3092\u8a3c\u660e\u3057\u3066\u3044\u307e\u3059\u304c\u3001\u305d\u306e\u8a3c\u660e\u306b\u306f\u4fe1\u53f7\u6e90\u306a\u3069\u306e\u4eee\u5b9a\u304c\u3042\u308a\u307e\u3059\u3002[2]<\/p>\n<p>25%\u306e\u8a08\u7b97\u304b\u3089\u8aad\u307f\u53d6\u308c\u308b\u306e\u306f\u3001\u57fa\u5e95\u3092\u77e5\u3089\u305a\u306b\u6e2c\u3063\u3066\u9001\u308a\u76f4\u3059\u884c\u70ba\u304c\u3001\u3075\u308b\u3044\u5206\u3051\u5f8c\u306e\u4e00\u81f4\u3092\u3069\u3046\u5909\u3048\u308b\u304b\u3067\u3059\u3002QBER\u306e\u6570\u5b57\u3092\u898b\u305f\u3089\u3001\u307e\u305a\u5206\u6bcd\u3068\u653b\u6483\u30fb\u88c5\u7f6e\u306e\u6761\u4ef6\u3092\u78ba\u304b\u3081\u307e\u3059\u3002\u305d\u306e\u3046\u3048\u3067\u3001\u691c\u67fb\u6a19\u672c\u306e\u7d50\u679c\u3068\u3001\u6700\u7d42\u7684\u306a\u9375\u306b\u3064\u3044\u3066\u306e\u5b89\u5168\u6027\u306e\u4e3b\u5f35\u3092\u5206\u3051\u308b\u3068\u3001BB84\u306e\u4ed5\u7d44\u307f\u3068\u5b9f\u7528\u4e0a\u306e\u8a55\u4fa1\u304c\u3064\u306a\u304c\u308a\u307e\u3059\u3002<\/p>\n<h2>\u51fa\u5178<\/h2>\n<ul>\n<li>[1] Charles H. Bennett, Gilles Brassard, <a href=\"https:\/\/arxiv.org\/abs\/2003.06557v1\">Quantum cryptography: Public key distribution and coin tossing<\/a>\u30021984\u5e74\u4f1a\u8b70\u9332175\u2013179\u30da\u30fc\u30b8\u306e\u30b9\u30ad\u30e3\u30f3\u30922020\u5e74\u306b\u767b\u9332\u3057\u305fv1\u3002II\u2013III\u7bc0\u3001\u7279\u306b177\u30da\u30fc\u30b8\u306e\u57fa\u5e95\u7167\u5408\u30fb\u691c\u67fb\u30fb\u6e2c\u5b9a\u518d\u9001\u306e\u4f8b\u3068\u53e4\u5178\u901a\u4fe1\u306e\u8a8d\u8a3c\u3092\u53c2\u7167\u3002\u672c\u7a3f\u306fZ\/X\u306e\u72b6\u614b\u30d9\u30af\u30c8\u30eb\u3067\u3001\u76d7\u8074\u8005\u3082\u57fa\u5e95\u3092\u534a\u3005\u306b\u9078\u3076\u6a21\u578b\u3092\u72ec\u81ea\u8a08\u7b97\u3057\u3066\u3044\u307e\u3059\u3002<\/li>\n<li>[2] Peter W. Shor, John Preskill, <a href=\"https:\/\/arxiv.org\/abs\/quant-ph\/0003004v2\">Simple Proof of Security of the BB84 Quantum Key Distribution Protocol<\/a>\u30022000\u5e745\u670812\u65e5v2\u3001\u7279\u306b4\u30da\u30fc\u30b8\u306eProtocol 3\u3068\u4fe1\u53f7\u6e90\u306e\u4eee\u5b9a\u3002\u73fe\u4ee3\u306e\u3042\u3089\u3086\u308b\u88c5\u7f6e\u3092\u3053\u306e\u8ad6\u6587\u3060\u3051\u3067\u8a55\u4fa1\u3067\u304d\u308b\u3068\u3044\u3046\u610f\u5473\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u3002<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>\u9001\u308a\u624b\u3068\u53d7\u3051\u624b\u304c\u540c\u3058\u3084\u308a\u65b9\u3067\u6e2c\u308c\u3070\u3001\u540c\u30580\u30681\u304c\u305d\u308d\u3046\u306f\u305a\u306e\u901a\u4fe1\u304c\u3042\u308a\u307e\u3059\u3002\u3068\u3053\u308d\u304c\u3001\u9014\u4e2d\u306e\u8ab0\u304b\u304c\u4fe1\u53f7\u3092\u6e2c\u308a\u3001\u305d\u306e\u7d50\u679c\u3092\u4f7f\u3063\u3066\u9001\u308a\u76f4\u3059\u3068\u3001\u5024\u304c\u98df\u3044\u9055\u3044\u59cb\u3081\u307e\u3059\u3002\u91cf\u5b50\u9375\u914d\u9001\u306eBB84\u306f\u3001\u3053\u3046\u3057\u305f\u6e2c\u5b9a\u306e\u5f71\u97ff\u3092\u624b\u304c\u304b\u308a\u306b\u3001\u79d8\u5bc6 [&hellip;]<\/p>\n","protected":false},"author":3,"featured_media":1653,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":true,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_feature_clip_id":0,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":false,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2},"jetpack_post_was_ever_published":false},"categories":[29],"tags":[336],"class_list":["post-1655","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-communications-networking","tag-bb84"],"jetpack_publicize_connections":[],"jetpack_sharing_enabled":true,"jetpack_featured_media_url":"https:\/\/quantumsea.net\/wp-content\/uploads\/2026\/10\/qs-bb84-intercept-resend-20261025-featured-bf56684be53c.png","_links":{"self":[{"href":"https:\/\/quantumsea.net\/index.php?rest_route=\/wp\/v2\/posts\/1655","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/quantumsea.net\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/quantumsea.net\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/quantumsea.net\/index.php?rest_route=\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/quantumsea.net\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1655"}],"version-history":[{"count":1,"href":"https:\/\/quantumsea.net\/index.php?rest_route=\/wp\/v2\/posts\/1655\/revisions"}],"predecessor-version":[{"id":1656,"href":"https:\/\/quantumsea.net\/index.php?rest_route=\/wp\/v2\/posts\/1655\/revisions\/1656"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/quantumsea.net\/index.php?rest_route=\/wp\/v2\/media\/1653"}],"wp:attachment":[{"href":"https:\/\/quantumsea.net\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1655"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/quantumsea.net\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1655"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/quantumsea.net\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1655"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}