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Efficient measurement of quantum dynamics via compressive sensing
A Shabani1, R L Kosut, M Mohseni
1Department of Chemistry, Princeton University, Princeton, New Jersey 08544, USA.
Physical Review Letters
|April 8, 2011
Summary
Compressive sensing techniques reduce experimental needs for quantum process tomography. This method accurately characterizes quantum systems, aiding quantum technology development.
Area of Science:
- Quantum Information Science
- Quantum Computing
- Quantum Sensing
Background:
- Characterizing engineered quantum systems requires resources that grow exponentially with system size.
- Quantum process tomography is essential for understanding quantum system dynamics but is resource-intensive.
Purpose of the Study:
- To develop a method that exponentially reduces experimental configurations for quantum process tomography.
- To enable efficient and high-fidelity characterization of quantum processes, even under decoherence.
Main Methods:
- Adaptation of compressive sensing techniques.
- Application to quantum processes that are nearly sparse in a specific basis.
- Implementation using only single-body preparations and measurements.
Main Results:
- Efficient, high-fidelity estimation of process matrices for a photonic two-qubit logic gate.
- Demonstration of accuracy and noise robustness under various decoherence strengths.
- Significant reduction in experimental configurations compared to traditional methods.
Conclusions:
- The developed compressive sensing approach offers an accurate and noise-robust method for quantum process tomography.
- This technique removes a key roadblock in the development and scaling of quantum technologies.
- Enables more efficient characterization of complex quantum systems.
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