Engineering entangling interactions for spectroscopic measurements with trapped ions

Christian Roos

co-authors: Cornelius Hempel, Ben Lanyon, Petar Jurcevic, Rene Gerritsma, Rainer Blatt

Institute for Quantum Optics and Quantum Information, Austrian Academy of Sciences, Innsbruck, Austria

Trapped and laser-cooled ions have excellent properties for high-precision spectroscopy. By quantum logic spectroscopy,  ions whose internal state cannot be detected easily can be read out via a second ion species trapped together with the spectroscopy ion. In my talk, I will discuss the use of geometric phases for a particular type of quantum logic spectroscopy that can be used to detect the absorption or emission of single photons with high detection efficiency.