Ling Zhong
Early Stage Researcher

Walther Meißner Institut, Munich, Germany

Academic Background

I studied Materials Physics at the University of Science and Technology Beijing (Sep. 2005-Jun. 2009). My BSc Thesis (2009) is Raman Study of Doped ZnO Nanowires. Then I joined the Erasmus Mundus program on Master of Nanoscience and Nanotechnology (Sep. 2009-Aug. 2011). I finished the first year of master in Katholieke Universiteit Leuven in Belgium and the second year in Chalmers Tekniska Hogskola in Sweden. For my MSc diploma project I worked on Superconducting CPW Resonators for Measurements on Molecular Spins in Quantum Device Physics Laboratory at Chalmers Microtechnology and Nanoscience (MC2). In Oct. 2011 I came to Germany and joined Walther-Meißner-Institut (WMI) for my PhD study. Then I became an Early Stage Researcher working on Generation and Detection of Quantum Correlations in Circuit QED systems

Description of Work

The Circuit-QED team at WMI aims at generating and detecting propagating microwave signals at the single photon level by using multi-resonator circuit quantum electrodynamics (QED) devices. A key problem in dealing with very weak microwave signals is the absence of single photon “click” detectors available in the optical regime. The group developed a signal recovery method to overcome this problem, which is based on the cancellation of the amplifier noise by a cross-correlation technique and also demonstrated that this method can be used to analyze thermal microwave states and propagating signals on a single photon level.

In the future we will start with two resonator systems to study the entanglement based on this method and then extend to a larger number of resonators to study entanglement scaling in a linear chain.


Dual-Path Methods for Propagating Quantum Microwaves
R. Di Candia, E. P. Menzel, L. Zhong, F. Deppe, A. Marx, R.Gross, and E. Solano
New J. Phys. 16, 015001 (2014)

Squeezing with a flux-driven Josephson parametric amplifier
L. Zhong, E. Menzel, R. DiCandia, P. Eder, M. Ihmig, A. Baust, M. Haeberlein, E. Hoffmann, K. Inomata, T. Yamamoto, Y. Nakamura, E. Solano, F. Deppe, A. Marx and R. Gross
New J. of Phys. 15, 125013 (2013)

Path Entanglement of Continuous-Variable Quantum Microwaves
E. P. Menzel, R. Di Candia, F. Deppe, P. Eder, L. Zhong, M. Ihmig, M. Haeberlein, A. Baust, E. Hoffmann, D. Ballester, K. Inomata, T. Yamamoto, Y. Nakamura, E. Solano, A. Marx, and R. Gross
Phys. Rev. Lett. 109, 250502 (2012).