论文标题
衡量或不测量这是一个问题
To Measure, or Not to Measure, That is the Question
论文作者
论文摘要
提出了一种方法，该方法允许人们在与指针状态接触期间观察到的可观察到的值的总和。在此与系统接触时，指针的状态被更新，并且在系统及时演变时之间的触点之间保持不变。在规定数量的此类联系之后，指针的位置由投影测量方法确定。结果是根据单一和马尔可夫耗散动力学的概率分布函数指定的，并将其与相同数量的被观察到的普通高斯测量结果进行了比较。作为一个特殊的例子，考虑了与不与系统的汉密尔顿系统通勤的指针的可观察接触。
A method is proposed that allows one to infer the sum of the values of an observable taken during contacts with a pointer state. Hereby the state of the pointer is updated while contacted with the system and remains unchanged between contacts while the system evolves in time. After a prescribed number of such contacts the position of the pointer is determined by means of a projective measurement. The outcome is specified in terms of a probability distribution function for unitary and Markovian dissipative dynamics and compared with the results of the same number of generalized Gaussian measurements of the considered observable. As a particular example a qubit is considered with an observable contacting to the pointer that does not commute with the system Hamiltonian.
