作者ksjs1911 (阿畜)
看板Physics
标题[题目] 问一个braket的问题
时间Wed Oct 24 18:12:32 2007
[领域] 量子力学
[来源] 习题
[题目] A is hermitian operator and A|a`> = a`|a`>
and B is an arbitary hermitian operator
show that Σ(a"-a')|<a'|B|a">|^2=1/2<a'|[B,[A,B]]|a'>
a"
[瓶颈]Σ a"<a'|B|a"><a"|B|a'> - Σ a'<a'|B|a"><a"|B|a'>
a" a"
= <a'|Ba"|a"><a"|B|a'> - ?????????????????
= <a'|BA|a"><a"|B|a'> -?????????????
=<a'|BAB|a'> -?????????
=1/2( <a'|2BAB|a'> - <a'|BBA|a'> - <a'|ABB|a'> )
问号的地方代表卡住了,可以帮我看一下哪里有问题吗?
还是我观念有错???
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1F：推 Linderman:我有空算看看吧XD 10/24 18:58