Experimental Self-Characterization of Quantum Measurements.
Physical review letters 124:4 (2020) 040402
Abstract:
The accurate and reliable description of measurement devices is a central problem in both observing uniquely nonclassical behaviors and realizing quantum technologies from powerful computing to precision metrology. To date quantum tomography is the prevalent tool to characterize quantum detectors. However, such a characterization relies on accurately characterized probe states, rendering reliability of the characterization lost in circular argument. Here we report a self-characterization method of quantum measurements based on reconstructing the response range-the entirety of attainable measurement outcomes, eliminating the reliance on known states. We characterize two representative measurements implemented with photonic setups and obtain fidelities above 99.99% with the conventional tomographic reconstructions. This initiates range-based techniques in characterizing quantum systems and foreshadows novel device-independent protocols of quantum information applications.Reaching out.
Nature reviews. Physics 2:6 (2020) 282-284
Abstract:
In the midst of the COVID-19 pandemic, science is crucial to inform public policy. At the same time, mistrust of scientists and misinformation about scientific facts are rampant. Six scientists, actively involved in outreach, reflect on how to build a better understanding and trust of science.How to Teach AI to Play Bell Non-Local Games: Reinforcement Learning
(2019)
Theoretical description and experimental simulation of quantum entanglement near open time-like curves via pseudo-density operators
(2019)
Phase diffusion and the small-noise approximation in linear amplifiers: Limitations and beyond
Quantum Verein zur Forderung des Open Access Publizierens in den Quantenwissenschaften 3 (2019) 200