Search Results
Single-photon emission from isolated monolayer islands of InGaN
2020, Sun, Xiaoxiao, Wang, Ping, Wang, Tao, Chen, Ling, Chen, Zhaoying, Gao, Kang, Aoki, Tomoyuki, Li, Mo, Zhang, Jian, Schulz, Tobias, Albrecht, Martin, Ge, Weikun, Arakawa, Yasuhiko, Shen, Bo, Holmes, Mark, Wang, Xinqiang
We identify and characterize a novel type of quantum emitter formed from InGaN monolayer islands grown using molecular beam epitaxy and further isolated via the fabrication of an array of nanopillar structures. Detailed optical analysis of the characteristic emission spectrum from the monolayer islands is performed, and the main transmission is shown to act as a bright, stable, and fast single-photon emitter with a wavelength of ~400 nm. © 2020, The Author(s).
Violation of a Leggett-Garg inequality with ideal non-invasive measurements
2012, Knee, G.C., Simmons, S., Gauger, E.M., Morton, J.J.L., Riemann, H., Abrosimov, N.V., Becker, P., Pohl, H.-J., Itoh, K.M., Thewalt, M.L.W., Briggs, G.A.D., Benjamin, S.C.
The quantum superposition principle states that an entity can exist in two different states simultaneously, counter to our 'classical' intuition. Is it possible to understand a given system's behaviour without such a concept? A test designed by Leggett and Garg can rule out this possibility. The test, originally intended for macroscopic objects, has been implemented in various systems. However to date no experiment has employed the 'ideal negative result' measurements that are required for the most robust test. Here we introduce a general protocol for these special measurements using an ancillary system, which acts as a local measuring device but which need not be perfectly prepared. We report an experimental realization using spin-bearing phosphorus impurities in silicon. The results demonstrate the necessity of a non-classical picture for this class of microscopic system. Our procedure can be applied to systems of any size, whether individually controlled or in a spatial ensemble.