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Measurement of Quantum Interference in a Silicon Ring Resonator Photon Source

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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.

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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.