Complete Physical Characterization of Quantum Nondemolition Measurements via Tomography
L Pereira1, J J García-Ripoll1, T Ramos1
1Instituto de Física Fundamental IFF-CSIC, Calle Serrano 113b, Madrid 28006, Spain.
Physical Review Letters
|July 16, 2022
Summary
We present a new method for characterizing quantum nondemolition (QND) detectors, enabling a full physical understanding of their measurement performance and errors. This improves QND detector calibration and design for quantum technologies.
Area of Science:
- Quantum Information Science
- Quantum Measurement and Metrology
Background:
- Quantum nondemolition (QND) detectors are crucial for precise quantum measurements.
- Characterizing detector performance, including fidelity and backaction, is essential for advancing quantum technologies.
Purpose of the Study:
- To introduce a self-consistent tomography framework for arbitrary QND detectors.
- To provide a complete physical characterization of QND detectors, quantifying measurement fidelity, ideality, and backaction.
Main Methods:
- Developed a self-consistent tomography approach for QND detectors.
- Applied the framework to a Jaynes-Cummings simulation of a superconducting qubit readout.
- Analyzed measurement processes, fidelity, ideality, and backaction.
Main Results:
- Successfully characterized nondispersive errors in a superconducting qubit readout.
- Quantified the backaction originating from the readout cavity.
- Calibrated the optimal measurement point for improved detector performance.
Conclusions:
- The developed tomography framework serves as a powerful diagnostic tool for QND detector dynamics.
- Identified specific errors and quantified backaction, paving the way for improved detector calibration and design.
- Demonstrated the practical applicability of the method in a realistic quantum system simulation.
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