A scheme of quantum state discrimination over specified states via weak-value measurement

作者：Chen, Xi^*; Dai, Hong Yi; Liu, Bo Yang; Zhang, Ming^*

来源：Physics Letters, Section A: General, Atomic and Solid State Physics , 2018, 382(14): 942-948.

DOI：10.1016/j.physleta.2018.02.005

• Weak-value measurement
• Quantum state discrimination
• Quantum state tomography
• Planar laser-energy distribution

The commonly adopted projective measurements are invalid in the specified task of quantum state discrimination when the discriminated states are superposition of planar-position basis states whose complex-number probability amplitudes have the same magnitude but different phases. Therefore we propose a corresponding scheme via weak-value measurement and examine the feasibility of this scheme. Furthermore, the role of the weak-value measurement in quantum state discrimination is analyzed and compared with one in quantum state tomography in this Letter.

• 出版日期2018-4-12
• 单位中国人民解放军国防科学技术大学