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Gradient Echo Quantum Memory in Warm Atomic Vapor
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A Method to Compute the Schrieffer-Wolff Generator for Analysis of Quantum Memory
Dong-Hwan Kim1, Su-Yong Lee1, Yonggi Jo1
1Emerging Science and Technology Directorate, Agency for Defense Development, Daejeon 34186, Korea.
Entropy (Basel, Switzerland)
|October 23, 2021
Summary
Quantum illumination enhances object detection in noisy environments using entangled light. A novel method analyzes microwave quantum memory crucial for improving quantum illumination performance.
Area of Science:
- Quantum Optics
- Quantum Information Science
Background:
- Quantum illumination leverages entangled light (signal and idler modes) to improve low-reflective object detection in noisy conditions.
- Optimal quantum illumination performance requires measuring the returned signal mode with the idler mode, necessitating a quantum memory for the idler mode.
Purpose of the Study:
- To propose an efficient computational method for analyzing quantum memory systems used in microwave quantum illumination.
- To enable the analysis of quantum memory performance for long-distance quantum communication and sensing applications.
Main Methods:
- Development of a novel ordering of bosonic operators for efficient computation of the Schrieffer-Wolff transformation generator.
- Application of the method to analyze a recently demonstrated microwave quantum memory utilizing coupled microwave cavities and a transmon qubit.
Main Results:
- The proposed operator ordering significantly simplifies the computation of the Schrieffer-Wolff transformation generator.
- The method provides a pathway for detailed analysis and optimization of microwave quantum memory systems.
Conclusions:
- The developed computational technique is effective for analyzing quantum memory systems relevant to quantum illumination.
- This work contributes to the advancement of quantum technologies for enhanced sensing and communication in challenging environments.
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