Comparing weak and projective measurements for quantum state tomography of a single-qubit system
arXiv:1711.03645
Abstract
We explore the use of weak quantum measurements for single-qubit quantum state tomography processes. Weak measurements are those where the coupling between the qubit and the measurement apparatus is weak; this results in the quantum state being disturbed less than in the case of a projective measurement. We employ a weak measurement tomography protocol developed by Das and Arvind, which they claim offers a new method of extracting information from quantum systems. We test the Das-Arvind scheme for various measurement strengths, and ensemble sizes, and reproduce their results using a sequential stochastic simulation. Lastly, we place these results in the context of current understanding of weak and projective measurements.
10 pages, typos corrected. Ref. 33 citations updated from "Caves et. al. [33]" to "Gross et. al. [33]"