Residual and Destroyed Accessible Information after Measurements
Rui Han1,2, Gerd Leuchs1,2,3, Markus Grassl1
1Max Planck Institute for the Science of Light, 91058 Erlangen, Germany.
Physical Review Letters
|May 15, 2018
Summary
This study introduces a new framework to quantify how quantum measurements extract, destroy, and retain information in quantum communication. It helps optimize information transfer by analyzing measurement performance for coherent states.
Area of Science:
- Quantum Information Science
- Quantum Measurement Theory
Background:
- Classical information transmission using quantum states is limited by suboptimal measurement strategies.
- Quantum measurements can destroy or retain information in the post-measurement state, especially in quantum nondemolition measurements.
Purpose of the Study:
- To develop a framework for characterizing quantum measurements based on information extraction, destruction, and residual information.
- To analyze the performance of different measurement schemes for discriminating coherent states.
Main Methods:
- Proposed a theoretical framework to quantify information flow during quantum measurements.
- Applied the framework to analyze receivers discriminating coherent states.
Main Results:
- Quantified the trade-offs between extracted, destroyed, and residual information for various measurement schemes.
- Demonstrated the framework's utility in evaluating measurement performance for coherent state discrimination.
Conclusions:
- The proposed framework provides a comprehensive method for understanding and optimizing quantum measurements.
- This characterization is crucial for improving the efficiency of quantum information processing and communication systems.
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