{"id":1369,"date":"2026-10-25T16:00:00","date_gmt":"2026-10-25T07:00:00","guid":{"rendered":"https:\/\/quantumsea.net\/?p=1369"},"modified":"2026-10-23T05:40:29","modified_gmt":"2026-10-22T20:40:29","slug":"qs-conditional-entropy-quantum-memory-20261023","status":"publish","type":"post","link":"https:\/\/quantumsea.net\/?p=1369","title":{"rendered":"\u91cf\u5b50\u6761\u4ef6\u4ed8\u304d\u30a8\u30f3\u30c8\u30ed\u30d4\u30fc\u3001\u6e2c\u5b9a\u3057\u305f\u8a18\u9332\u3068\u91cf\u5b50\u306e\u76f8\u624b\u3092\u533a\u5225\u3059\u308b"},"content":{"rendered":"<p>\u7247\u65b9\u306e\u60c5\u5831\u304c\u5206\u304b\u308b\u3068\u3001\u3082\u3046\u7247\u65b9\u306b\u3064\u3044\u3066\u306e\u4e0d\u78ba\u304b\u3055\u304c\u6e1b\u308b\u3002\u53e4\u5178\u7684\u306a\u60c5\u5831\u3067\u306f\u81ea\u7136\u306a\u8aac\u660e\u3067\u3059\u304c\u3001\u91cf\u5b50\u6761\u4ef6\u4ed8\u304d\u30a8\u30f3\u30c8\u30ed\u30d4\u30fc\u306b\u306f\u8ca0\u306e\u5024\u304c\u73fe\u308c\u307e\u3059\u3002\u3053\u308c\u3092\u300c\u8ca0\u306e\u78ba\u7387\u300d\u3084\u300c\u77e5\u308a\u904e\u304e\u305f\u72b6\u614b\u300d\u3068\u8aad\u3080\u524d\u306b\u3001\u6761\u4ef6\u3068\u3057\u3066\u6301\u3063\u3066\u3044\u308b\u3082\u306e\u304c\u3001\u6e2c\u5b9a\u7d50\u679c\u306e\u8a18\u9332\u306a\u306e\u304b\u3001\u91cf\u5b50\u7cfb\u305d\u306e\u3082\u306e\u306a\u306e\u304b\u3092\u5206\u3051\u3066\u307f\u307e\u3059\u3002<\/p>\n<section class=\"influvetor-quick-summary\">\n<p><strong>\u7c21\u5358\u306b\u307e\u3068\u3081\u308b\u3068\uff1f<\/strong><\/p>\n<ul>\n<li>\u91cf\u5b50\u6761\u4ef6\u4ed8\u304d\u30a8\u30f3\u30c8\u30ed\u30d4\u30fc\u306fS(A|B)=S(AB)\u2212S(B)\u3067\u3059\u3002\u5168\u4f53\u3068\u4e00\u90e8\u5206\u306e\u30a8\u30f3\u30c8\u30ed\u30d4\u30fc\u306e\u5dee\u306a\u306e\u3067\u3001\u91cf\u5b50\u72b6\u614b\u3067\u306f\u8ca0\u306b\u306a\u308a\u5f97\u307e\u3059\u3002<\/li>\n<li>\u30d9\u30eb\u72b6\u614b\u3067\u306f\u5168\u4f53\u304c\u7d14\u7c8b\u3067S(AB)=0\u3001\u7247\u65b9\u306f\u6700\u5927\u6df7\u5408\u3067S(B)=1\u3068\u306a\u308a\u3001\u5dee\u306f\u22121 bit\u3067\u3059\u3002\u78ba\u7387\u3084\u901a\u5e38\u306e\u72b6\u614b\u30a8\u30f3\u30c8\u30ed\u30d4\u30fc\u304c\u8ca0\u306b\u306a\u3063\u305f\u308f\u3051\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u3002<\/li>\n<li>B\u3092\u91cf\u5b50\u7cfb\u3068\u3057\u3066\u4fdd\u3064\u5834\u5408\u3068\u3001B\u3092\u6e2c\u3063\u3066\u53e4\u5178\u7684\u306a\u8a18\u9332\u3078\u5909\u3048\u308b\u5834\u5408\u306f\u5225\u306e\u6761\u4ef6\u3067\u3059\u3002\u540c\u30580\u30fb1\u306e\u76f8\u95a2\u304c\u898b\u3048\u3066\u3082\u3001\u6b8b\u3063\u3066\u3044\u308b\u60c5\u5831\u306f\u7570\u306a\u308a\u307e\u3059\u3002<\/li>\n<\/ul>\n<\/section>\n<h2>\u5168\u4f53\u306e\u4e0d\u78ba\u304b\u3055\u304b\u3089\u3001\u4e00\u90e8\u5206\u3092\u5dee\u3057\u5f15\u304f<\/h2>\n<p>\u6709\u9650\u6b21\u5143\u306e\u91cf\u5b50\u72b6\u614b\u03c1\u306e\u30d5\u30a9\u30f3\u30fb\u30ce\u30a4\u30de\u30f3\u30a8\u30f3\u30c8\u30ed\u30d4\u30fc\u306f\u3001\u56fa\u6709\u5024\u03bb\u3092\u4f7f\u3063\u3066S(\u03c1)=\u2212\u03a3\u03bb log\u2082\u03bb\u3068\u66f8\u3051\u307e\u3059\u30020 log\u20820\u306f0\u3068\u3057\u3066\u6271\u3044\u3001\u3053\u3053\u3067\u306f\u5358\u4f4d\u3092bit\u306b\u305d\u308d\u3048\u307e\u3059\u3002\u7d14\u7c8b\u72b6\u614b\u306a\u30890\u3001\u4e8c\u6b21\u5143\u306e\u6700\u5927\u6df7\u5408\u72b6\u614bI\/2\u306a\u30891\u3067\u3059\u3002I\u306f\u4e8c\u6b21\u5143\u306e\u5358\u4f4d\u884c\u5217\u3067\u3059\u3002<\/p>\n<p>A\u3068B\u3092\u5408\u308f\u305b\u305f\u72b6\u614b\u3092\u03c1<sub>AB<\/sub>\u3068\u3059\u308b\u3068\u3001B\u3060\u3051\u306e\u72b6\u614b\u03c1<sub>B<\/sub>\u306fA\u3092\u90e8\u5206\u30c8\u30ec\u30fc\u30b9\u3057\u3066\u6c42\u3081\u307e\u3059\u3002\u305d\u306e\u4e8c\u3064\u306e\u30a8\u30f3\u30c8\u30ed\u30d4\u30fc\u304b\u3089\u3001<strong>S(A|B)=S(\u03c1<sub>AB<\/sub>)\u2212S(\u03c1<sub>B<\/sub>)<\/strong>\u3092\u5b9a\u7fa9\u3057\u307e\u3059\u3002[1\u3001\u5f0f10.73] \u672c\u7a3f\u306eS\u306f\u3001\u539f\u8cc7\u6599\u304cH\u3068\u8868\u8a18\u3057\u3066\u3044\u308b\u91cf\u5b50\u30a8\u30f3\u30c8\u30ed\u30d4\u30fc\u3068\u540c\u3058\u91cf\u3067\u3059\u3002<\/p>\n<p>\u53e4\u5178\u7684\u306a\u96e2\u6563\u5909\u6570X\u3001Y\u3067\u3082\u3001\u6761\u4ef6\u4ed8\u304d\u30a8\u30f3\u30c8\u30ed\u30d4\u30fc\u3092H(X|Y)=H(XY)\u2212H(Y)\u3068\u66f8\u3051\u307e\u3059\u3002\u3053\u3061\u3089\u306f\u3001Y\u306e\u5024\u3054\u3068\u306bX\u306e\u78ba\u7387\u5206\u5e03\u306e\u30a8\u30f3\u30c8\u30ed\u30d4\u30fc\u3092\u6c42\u3081\u3001\u305d\u306e\u5024\u3092\u78ba\u7387\u3067\u5e73\u5747\u3057\u305f\u3082\u306e\u306a\u306e\u30670\u4ee5\u4e0a\u3067\u3059\u3002Y\u304b\u3089X\u304c\u5b8c\u5168\u306b\u5206\u304b\u308b\u306a\u30890\u306b\u306a\u308a\u307e\u3059\u3002[1\u3001\u5f0f10.72]<\/p>\n<p>\u91cf\u5b50\u306e\u5834\u5408\u306b\u306f\u3001B\u3092\u4fdd\u6709\u3059\u308b\u3053\u3068\u3092\u3001\u3042\u3089\u304b\u3058\u3081\u6c7a\u307e\u3063\u305f\u4e00\u3064\u306e\u53e4\u5178\u7684\u306a\u5024\u3092\u77e5\u308b\u3053\u3068\u3078\u7f6e\u304d\u63db\u3048\u3089\u308c\u307e\u305b\u3093\u3002\u5f0f\u306e\u5f15\u304d\u7b97\u306f\u4f3c\u3066\u3044\u3066\u3082\u3001\u5168\u4f53\u3068\u90e8\u5206\u306e\u95a2\u4fc2\u304c\u53e4\u5178\u7684\u306a\u78ba\u7387\u8868\u3068\u306f\u9055\u3044\u307e\u3059\u3002<\/p>\n<h2>\u7247\u65b9\u304c\u540c\u3058\u3067\u3082\u3001\u5dee\u306f1\u30010\u3001\u22121\u306b\u5909\u308f\u308b<\/h2>\n<p>\u4e8c\u3064\u306e\u91cf\u5b50\u30d3\u30c3\u30c8A\u3001B\u3067\u3001B\u3060\u3051\u306e\u72b6\u614b\u304c\u3069\u308c\u3082I\/2\u306b\u306a\u308b\u4e09\u4f8b\u3092\u6bd4\u3079\u307e\u3059\u3002\u8a08\u7b97\u306e\u57fa\u5e95\u306f00\u300101\u300110\u300111\u306e\u9806\u3068\u3057\u3001\u5de6\u3092A\u3001\u53f3\u3092B\u3068\u6c7a\u3081\u307e\u3059\u3002<\/p>\n<p>\u6700\u521d\u306f\u3001A\u3082B\u3082\u72ec\u7acb\u306b\u6700\u5927\u6df7\u5408\u72b6\u614b\u306b\u3057\u305fI\/2\u2297I\/2\u3067\u3059\u3002\u5168\u4f53\u306e\u56fa\u6709\u5024\u306f\u56db\u3064\u3068\u30821\/4\u306a\u306e\u3067S(AB)=2\u3002B\u3060\u3051\u3067\u306fS(B)=1\u3067\u3059\u304b\u3089\u3001S(A|B)=1\u3067\u3059\u3002B\u3092\u6301\u3063\u3066\u3044\u3066\u3082\u3001\u3053\u306e\u7a4d\u72b6\u614b\u306eA\u306b\u3064\u3044\u3066\u8ffd\u52a0\u306e\u76f8\u95a2\u60c5\u5831\u306f\u5f97\u3089\u308c\u307e\u305b\u3093\u3002<\/p>\n<p>\u4e8c\u3064\u76ee\u306f\u300100\u306811\u3092\u534a\u5206\u305a\u3064\u9078\u3093\u3067\u6e96\u5099\u3057\u305f\u53e4\u5178\u7684\u306a\u76f8\u95a2\u306e\u3042\u308b\u6df7\u5408\u72b6\u614b\u3067\u3059\u3002\u5bc6\u5ea6\u884c\u5217\u306e\u5bfe\u89d2\u6210\u5206\u306f(1\/2,0,0,1\/2)\u3067\u3001\u975e\u5bfe\u89d2\u6210\u5206\u306f0\u3067\u3059\u3002\u5168\u4f53\u306e\u56fa\u6709\u5024\u306f1\/2\u30011\/2\u30010\u30010\u306a\u306e\u3067S(AB)=1\u3001B\u306eS(B)=1\u3092\u5f15\u304f\u30680\u3067\u3059\u3002\u3069\u3061\u3089\u3082Z\u65b9\u5411\u3067\u6e2c\u308c\u3070\u3001B\u306e\u7d50\u679c\u304b\u3089A\u306e\u7d50\u679c\u304c\u5206\u304b\u308a\u307e\u3059\u3002<\/p>\n<p>\u4e09\u3064\u76ee\u306f\u30d9\u30eb\u72b6\u614b|\u03a6+\u27e9=(|00\u27e9+|11\u27e9)\/\u221a2\u3067\u3059\u3002\u5168\u4f53\u306f\u4e00\u3064\u306e\u72b6\u614b\u30d9\u30af\u30c8\u30eb\u3067\u8868\u305b\u308b\u7d14\u7c8b\u72b6\u614b\u306a\u306e\u3067S(AB)=0\u3002\u305d\u308c\u3067\u3082B\u3060\u3051\u3092\u898b\u308b\u3068I\/2\u3067S(B)=1\u3067\u3059\u3002\u3057\u305f\u304c\u3063\u3066S(A|B)=\u22121\u306b\u306a\u308a\u307e\u3059\u3002[1] \u3053\u306e\u8a08\u7b97\u3067\u4f7f\u3063\u305f\u56fa\u6709\u5024\u3084\u78ba\u7387\u306f\u3059\u3079\u30660\u4ee5\u4e0a\u3067\u3042\u308a\u3001\u8ca0\u306b\u306a\u3063\u305f\u306e\u306f\u4e8c\u3064\u306e\u30a8\u30f3\u30c8\u30ed\u30d4\u30fc\u306e\u5dee\u3060\u3051\u3067\u3059\u3002<\/p>\n<figure><img decoding=\"async\" src=\"https:\/\/quantumsea.net\/wp-content\/uploads\/2026\/10\/qs-conditional-entropy-quantum-memory-20261023-figure-d5820a5d59c0.png\" alt=\"B\u306e\u30a8\u30f3\u30c8\u30ed\u30d4\u30fc\u304c\u3069\u308c\u30821 bit\u3068\u306a\u308b\u4e09\u72b6\u614b\u3002\u72ec\u7acb\u306a\u6700\u5927\u6df7\u5408\u3067\u306f\u5168\u4f532\u3001\u6761\u4ef6\u4ed8\u304d1\u3002\u53e4\u5178\u7684\u76f8\u95a2\u3067\u306f\u5168\u4f531\u3001\u6761\u4ef6\u4ed8\u304d0\u3002\u30d9\u30eb\u72b6\u614b\u3067\u306f\u5168\u4f530\u3001\u6761\u4ef6\u4ed8\u304d\u30de\u30a4\u30ca\u30b91\u3002\" style=\"width:100%;max-width:100%;height:auto\"><figcaption>\u65e2\u77e5\u306e\u4e09\u3064\u306e\u5bc6\u5ea6\u884c\u5217\u304b\u3089\u72ec\u81ea\u306b\u8a08\u7b97\u3057\u305f\u5024\u3002B\u306e\u5c40\u6240\u72b6\u614b\u3092\u305d\u308d\u3048\u3001\u5168\u4f53\u306e\u9055\u3044\u3092\u6bd4\u8f03\u3057\u3066\u3044\u308b\u3002\u5b9f\u6a5f\u306e\u63a8\u5b9a\u5024\u3067\u306f\u306a\u3044\u3002<\/figcaption><\/figure>\n<p>\u4e09\u4f8b\u3067\u306fB\u306e\u5bc6\u5ea6\u884c\u5217\u304c\u307e\u3063\u305f\u304f\u540c\u3058\u3067\u3059\u3002B\u3060\u3051\u3092\u4f55\u5ea6\u6e2c\u3063\u3066\u3082\u3001\u305d\u306e\u5c40\u6240\u72b6\u614b\u306e\u9055\u3044\u304b\u3089\u4e09\u8005\u3092\u533a\u5225\u3059\u308b\u3053\u3068\u306f\u3067\u304d\u307e\u305b\u3093\u3002\u6761\u4ef6\u4ed8\u304d\u30a8\u30f3\u30c8\u30ed\u30d4\u30fc\u3092\u8a08\u7b97\u3059\u308b\u306b\u306f\u3001B\u3060\u3051\u3067\u306a\u304f\u5168\u4f53\u03c1<sub>AB<\/sub>\u306e\u60c5\u5831\u304c\u5fc5\u8981\u3067\u3059\u3002\u5358\u306b\u300c\u7247\u65b9\u304c\u30e9\u30f3\u30c0\u30e0\u3060\u304b\u3089\u3082\u3064\u308c\u3066\u3044\u308b\u300d\u3068\u5224\u65ad\u3067\u304d\u306a\u3044\u7406\u7531\u3082\u3001\u3053\u3053\u306b\u8868\u308c\u307e\u3059\u3002<\/p>\n<h2>\u91cf\u5b50\u306e\u76f8\u624b\u3092\u3001\u6e2c\u5b9a\u7d50\u679c\u306e\u8a18\u9332\u3078\u5909\u3048\u305f\u3089<\/h2>\n<p>\u30d9\u30eb\u72b6\u614b\u3068\u53e4\u5178\u7684\u306a\u76f8\u95a2\u72b6\u614b\u306f\u3001Z\u65b9\u5411\u3067A\u3001B\u3092\u6e2c\u3063\u305f\u7d50\u679c\u3060\u3051\u306a\u3089\u3001\u3069\u3061\u3089\u308200\u306811\u304c\u534a\u3005\u3067\u3059\u3002\u3057\u304b\u3057\u3001\u30d9\u30eb\u72b6\u614b\u306e\u5bc6\u5ea6\u884c\u5217\u306b\u306f00\u306811\u3092\u7d50\u3076\u975e\u5bfe\u89d2\u6210\u5206\u304c\u3042\u308a\u3001\u53e4\u5178\u7684\u306a\u6df7\u5408\u3067\u306f\u305d\u308c\u304c\u3042\u308a\u307e\u305b\u3093\u3002\u3053\u306e\u9055\u3044\u3092\u6b8b\u3057\u305f\u307e\u307eB\u3092\u6301\u3064\u3053\u3068\u3068\u3001B\u3092\u6e2c\u5b9a\u3057\u3066\u7d50\u679c\u3060\u3051\u3092\u8a18\u9332\u3059\u308b\u3053\u3068\u306f\u540c\u3058\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u3002<\/p>\n<p>\u30d9\u30eb\u72b6\u614b\u306eB\u3092Z\u65b9\u5411\u3067\u6e2c\u308a\u3001\u305d\u306e\u7d50\u679c\u3092\u53e4\u5178\u7684\u306a\u8a18\u9332Y\u3068\u3057\u3066\u4fdd\u3064\u4f8b\u3092\u8003\u3048\u307e\u3059\u3002A\u3068Y\u306e\u72b6\u614b\u306f\u3001A\u304c0\u3067\u8a18\u9332\u304c0\u306e\u7d44\u3068\u3001A\u304c1\u3067\u8a18\u9332\u304c1\u306e\u7d44\u3092\u534a\u5206\u305a\u3064\u6df7\u305c\u305f\u3082\u306e\u306b\u306a\u308a\u307e\u3059\u3002\u5148\u307b\u3069\u306e\u4e8c\u3064\u76ee\u3068\u540c\u3058\u884c\u5217\u306e\u5f62\u3067\u3059\u3002S(AY)=1\u3001S(Y)=1\u306a\u306e\u3067\u3001<strong>S(A|Y)=0<\/strong>\u3067\u3059\u3002<\/p>\n<p>Y=0\u3060\u3063\u305f\u56de\u3060\u3051\u3092\u898b\u308c\u3070A\u306f|0\u27e9\u3001Y=1\u3060\u3063\u305f\u56de\u3060\u3051\u306a\u3089|1\u27e9\u3067\u3001\u3069\u3061\u3089\u3082\u7d14\u7c8b\u72b6\u614b\u3067\u3059\u3002\u5404\u6761\u4ef6\u3067\u306e\u30a8\u30f3\u30c8\u30ed\u30d4\u30fc\u3092\u5e73\u5747\u3057\u3066\u30820\u306b\u306a\u308a\u307e\u3059\u3002\u5143\u306eS(A|B)=\u22121\u3068\u77db\u76fe\u3059\u308b\u306e\u3067\u306f\u306a\u304f\u3001\u6761\u4ef6\u3068\u3057\u3066\u5229\u7528\u3059\u308b\u7cfb\u3092B\u304b\u3089\u6e2c\u5b9a\u8a18\u9332Y\u3078\u5909\u3048\u305f\u7d50\u679c\u3067\u3059\u3002<\/p>\n<p>\u72ec\u81ea\u8a08\u7b97\u3067\u306f\u3001B\u3092Z\u65b9\u5411\u3067\u6e2c\u3063\u3066\u7d50\u679c\u3092\u4fdd\u5b58\u3059\u308b\u64cd\u4f5c\u3092\u4e8c\u3064\u306e\u884c\u5217\u3067\u8868\u3057\u3001\u305d\u306e\u51fa\u529b\u3092\u8db3\u3057\u5408\u308f\u305b\u307e\u3057\u305f\u3002\u51fa\u529b\u304c\u53e4\u5178\u7684\u76f8\u95a2\u306e\u884c\u5217\u306b\u4e00\u81f4\u3059\u308b\u3053\u3068\u3001A\u3068B\u305d\u308c\u305e\u308c\u306e\u5c40\u6240\u72b6\u614b\u306f\u6e2c\u5b9a\u524d\u5f8c\u3067I\/2\u306e\u307e\u307e\u306a\u306e\u306b\u3001\u5168\u4f53\u306e\u30a8\u30f3\u30c8\u30ed\u30d4\u30fc\u306f0\u304b\u30891\u3078\u5909\u308f\u308b\u3053\u3068\u3092\u78ba\u8a8d\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n<h2>\u540c\u3058\u300c\u6761\u4ef6\u4ed8\u304d\u300d\u3067\u3082\u3001\u6b8b\u3057\u305f\u3082\u306e\u3092\u78ba\u304b\u3081\u308b<\/h2>\n<p>\u7d50\u679c\u3092\u8aad\u3080\u3068\u304d\u306f\u3001B\u304c\u91cf\u5b50\u30e1\u30e2\u30ea\u30fc\u3068\u3057\u3066\u6b8b\u3063\u3066\u3044\u308b\u306e\u304b\u3001\u3059\u3067\u306b\u6e2c\u3063\u3066\u7d50\u679c\u306e\u4e00\u89a7\u3078\u5909\u308f\u3063\u305f\u306e\u304b\u3092\u78ba\u8a8d\u3057\u307e\u3059\u3002\u6e2c\u5b9a\u3059\u308b\u57fa\u5e95\u3084\u3001\u7d50\u679c\u3092\u4fdd\u5b58\u3057\u305f\u304b\u6368\u3066\u305f\u304b\u3082\u6761\u4ef6\u306e\u4e00\u90e8\u3067\u3059\u3002\u6e2c\u5b9a\u8a18\u9332\u3060\u3051\u3092\u4f7f\u3063\u305f\u63a8\u5b9a\u5024\u3068\u3001\u6e2c\u5b9a\u524d\u306e\u91cf\u5b50\u7cfb\u3092\u6761\u4ef6\u306b\u3057\u305f\u91cf\u3092\u3001\u305d\u306e\u307e\u307e\u540c\u4e00\u8996\u3057\u306a\u3044\u3088\u3046\u306b\u3057\u307e\u3059\u3002<\/p>\n<p>\u3053\u3053\u3067\u306e\u8ca0\u306e\u5024\u306f\u3001\u901a\u5e38\u306e\u30d5\u30a9\u30f3\u30fb\u30ce\u30a4\u30de\u30f3\u30a8\u30f3\u30c8\u30ed\u30d4\u30fc\u304c\u8ca0\u3067\u3042\u308b\u3053\u3068\u3092\u610f\u5473\u3057\u307e\u305b\u3093\u3002\u307e\u305f\u3001\u4e00\u56de\u306e\u6e2c\u5b9a\u304b\u3089\u8ca0\u306ebit\u6570\u3092\u8aad\u307f\u53d6\u308b\u3001\u3068\u3044\u3046\u610f\u5473\u3067\u3082\u3042\u308a\u307e\u305b\u3093\u3002\u91cf\u5b50\u6761\u4ef6\u4ed8\u304d\u30a8\u30f3\u30c8\u30ed\u30d4\u30fc\u3092\u901a\u4fe1\u8cc7\u6e90\u306e\u91cf\u3068\u7d50\u3073\u3064\u3051\u308b\u306b\u306f\u3001\u5171\u6709\u72b6\u614b\u3001\u8a31\u3055\u308c\u308b\u64cd\u4f5c\u3001\u591a\u6570\u306e\u30b3\u30d4\u30fc\u306a\u3069\u3092\u6307\u5b9a\u3057\u305f\u901a\u4fe1\u8ab2\u984c\u306e\u5b9a\u5f0f\u5316\u304c\u5fc5\u8981\u3067\u3059\u3002\u672c\u7a3f\u3067\u306f\u3001\u305d\u306e\u6027\u80fd\u4fdd\u8a3c\u306b\u8e0f\u307f\u8fbc\u307e\u305a\u3001\u72b6\u614b\u3068\u6e2c\u5b9a\u8a18\u9332\u3092\u533a\u5225\u3059\u308b\u8a08\u7b97\u4f8b\u306b\u7bc4\u56f2\u3092\u7d5e\u3063\u3066\u3044\u307e\u3059\u3002<\/p>\n<p>\u6570\u5024\u8a08\u7b97\u3067\u306f\u3001\u4e38\u3081\u8aa4\u5dee\u3067\u672c\u67650\u306e\u56fa\u6709\u5024\u304c\u5c0f\u3055\u306a\u8ca0\u6570\u3068\u3057\u3066\u51fa\u308b\u3053\u3068\u3082\u3042\u308a\u307e\u3059\u3002\u305d\u306e\u8aa4\u5dee\u3068\u3001\u30a8\u30f3\u30c8\u30ed\u30d4\u30fc\u306e\u5dee\u3068\u3057\u3066\u5f97\u305f\u22121\u3092\u6df7\u540c\u3057\u3066\u306f\u3044\u3051\u307e\u305b\u3093\u3002\u4eca\u56de\u306e\u8a08\u7b97\u3067\u306f\u72b6\u614b\u306e\u6b63\u534a\u5b9a\u5024\u6027\u3068\u30c8\u30ec\u30fc\u30b91\u3092\u78ba\u8a8d\u3057\u3001\u7d76\u5bfe\u502410\u306e\u221212\u4e57\u4ee5\u4e0b\u306e\u56fa\u6709\u5024\u30920\u3068\u3057\u3066\u30a8\u30f3\u30c8\u30ed\u30d4\u30fc\u3092\u8a55\u4fa1\u3057\u307e\u3057\u305f\u3002\u65e2\u77e5\u306e\u7406\u60f3\u884c\u5217\u306b\u3088\u308b\u7167\u5408\u3067\u3042\u308a\u3001\u5b9f\u9a13\u30c7\u30fc\u30bf\u306e\u8aa4\u5dee\u8a55\u4fa1\u3084\u4e00\u822c\u306e\u3082\u3064\u308c\u5224\u5b9a\u5668\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u3002<\/p>\n<h2>\u51fa\u5178<\/h2>\n<ol>\n<li>John Preskill, <a href=\"https:\/\/www.preskill.caltech.edu\/ph219\/chap10_6A_2025.pdf\">Quantum Information, Chapter 10: Quantum Shannon Theory<\/a>\uff082025\u5e746\u6708\u6539\u8a02\u306e\u8b1b\u7fa9\u8349\u7a3f\uff09\u3002\u00a710.2\u3001\u672c\u658714\u201317\u9801\u3001\u7279\u306b\u672c\u658716\u9801\u306e\u5f0f10.72\u201310.73\u3002\u65e2\u5b58\u8cc7\u6599\u5eab\u306e\u540c\u7248\u3092\u518d\u5229\u7528\u3057\u30012026\u5e7410\u670823\u65e5\u306b\u516c\u5f0f\u63b2\u8f09\u7248\u306e\u8a72\u5f53\u7b87\u6240\u3092\u518d\u78ba\u8a8d\u3002\u4e09\u72b6\u614b\u306e\u6570\u5024\u6bd4\u8f03\u3001\u6e2c\u5b9a\u8a18\u9332\u3078\u306e\u5909\u63db\u4f8b\u3001\u56f3\u8868\u306f\u72ec\u81ea\u4f5c\u6210\u3002<\/li>\n<\/ol>\n","protected":false},"excerpt":{"rendered":"<p>\u7247\u65b9\u306e\u60c5\u5831\u304c\u5206\u304b\u308b\u3068\u3001\u3082\u3046\u7247\u65b9\u306b\u3064\u3044\u3066\u306e\u4e0d\u78ba\u304b\u3055\u304c\u6e1b\u308b\u3002\u53e4\u5178\u7684\u306a\u60c5\u5831\u3067\u306f\u81ea\u7136\u306a\u8aac\u660e\u3067\u3059\u304c\u3001\u91cf\u5b50\u6761\u4ef6\u4ed8\u304d\u30a8\u30f3\u30c8\u30ed\u30d4\u30fc\u306b\u306f\u8ca0\u306e\u5024\u304c\u73fe\u308c\u307e\u3059\u3002\u3053\u308c\u3092\u300c\u8ca0\u306e\u78ba\u7387\u300d\u3084\u300c\u77e5\u308a\u904e\u304e\u305f\u72b6\u614b\u300d\u3068\u8aad\u3080\u524d\u306b\u3001\u6761\u4ef6\u3068\u3057\u3066\u6301\u3063\u3066\u3044\u308b\u3082\u306e\u304c\u3001\u6e2c\u5b9a\u7d50 [&hellip;]<\/p>\n","protected":false},"author":3,"featured_media":1367,"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":[30],"tags":[184],"class_list":["post-1369","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-computing","tag-quantum-computers"],"jetpack_publicize_connections":[],"jetpack_sharing_enabled":true,"jetpack_featured_media_url":"https:\/\/quantumsea.net\/wp-content\/uploads\/2026\/10\/qs-conditional-entropy-quantum-memory-20261023-featured-a1097ca0ef55.png","_links":{"self":[{"href":"https:\/\/quantumsea.net\/index.php?rest_route=\/wp\/v2\/posts\/1369","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=1369"}],"version-history":[{"count":1,"href":"https:\/\/quantumsea.net\/index.php?rest_route=\/wp\/v2\/posts\/1369\/revisions"}],"predecessor-version":[{"id":1370,"href":"https:\/\/quantumsea.net\/index.php?rest_route=\/wp\/v2\/posts\/1369\/revisions\/1370"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/quantumsea.net\/index.php?rest_route=\/wp\/v2\/media\/1367"}],"wp:attachment":[{"href":"https:\/\/quantumsea.net\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1369"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/quantumsea.net\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1369"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/quantumsea.net\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1369"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}