Weak measurements with a qubit meter

作者：Wu Shengjun^*; Molmer Klaus

来源：Physics Letters A, 2009, 374(1): 34-39.

DOI：10.1016/j.physleta.2009.10.026

• Weak measurement
• Weak value
• Cold trapped ion
• Product observable

We derive schemes to measure the so-called weak values of quantum system observables by coupling of the system to a qubit meter system. We highlight, in particular, the meaning of the imaginary part of the weak values, and show how it can be measured directly on equal footing with the real part of the weak value. We present compact expressions for the weak value of single qubit observables and of product observables on qubit pairs. Experimental studies of the results are suggested with cold trapped ions.

• 出版日期2009-12-14