Comparison of quantum state protection against decoherence via weak measurement, a survey

TL;DR

This survey reviews various quantum state protection schemes against decoherence, focusing on weak measurement techniques and their effectiveness in balancing information gain and system disturbance.

Contribution

It provides a comprehensive classification and comparison of weak measurement-based protection schemes, including WMQMR, QFBC, and QFFC, with numerical analysis of their performance.

Findings

Weak measurement schemes can effectively mitigate decoherence.

Performance varies depending on noise sources and protection method.

Numerical simulations demonstrate the relative strengths of each scheme.

Abstract

One of the crucial tasks in quantum systems is to reduce the effects of decoherence due to the unavoidable interactions between a system and its environment. Many protection schemes have been proposed recently, among them the weak measurement quantum measurement reversal (WMQMR), weak measurement-based quantum feedback control (QFBC) and quantum feed-forward control (QFFC) are reviewed in this paper. By considering weak measurement, the aim is to find a balance between information gain and disturbance of the system caused by the measurement. We classify different types of measurement and give the definition of noise sources and their effects on the state of the system. Finally, we compare and analyze the performance of the discussed protection schemes for different noise sources by numerical simulations.