RSS icon
Twitter icon
Facebook icon
Vimeo icon
YouTube icon

Open Quantum Systems: Interplay between the Nano- and Macro- Worlds

May 12, 2014 - 12:00am
Huaixiu Zheng
Duke University

The spectacular progress in manipulation of quantum states of matter in the past decades has stimulated a lot of interests in open quantum systems. In this talk, I will cover my recent work on the interplay between the environment and individual quantum objects in two open systems: 1) interacting photons in waveguide-QED systems, and 2) Majorana quantum critical behavior of a resonant level coupled to a dissipative environment.  Photon-photon ″bound states″ emerge in a one-dimensional waveguide as a result of the strong coupling to a two-level system. Recent experiments have observed the key signature of those bound state: bunching in the second-order correlation function. Furthermore, I will introduce a two-qubit waveguide-QED system which allows us to access non-Markovian physics in photon-photon correlations. In a dissipative resonant level, a quantum phase transition is observed experimentally, and the scaling laws at the quantum critical point (QCP) are accounted for theoretically by mapping to a Luttinger liquid paradigm. By fine-tuning the system, an anomalous non-Fermi-liquid temperature dependence at the QCP is uncovered, indicating fractionalization of the resonant level into two Majorana quasiparticles.

Host: Jake Taylor

CSS 2115 @ 2pm
College Park, MD 20742

Subscribe to A Quantum Bit 

Quantum physics began with revolutionary discoveries in the early twentieth century and continues to be central in today’s physics research. Learn about quantum physics, bit by bit. From definitions to the latest research, this is your portal. Subscribe to receive regular emails from the quantum world. Previous Issues...

Sign Up Now

Sign up to receive A Quantum Bit in your email!

 Have an idea for A Quantum Bit? Submit your suggestions to