Comparing weak and projective measurements for quantum state tomography of a single-qubit system

• Main Author: Chowdhury, Shoumik
• Format: Journal Article
• Language: English
• Published: 09-11-2017
• Subjects: Physics - Applied Physics; Physics - Quantum Physics
• DOI: 10.48550/arxiv.1711.03645

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.