The application of topology in optics has led to a new paradigm in developing photonic devices with robust properties against disorder.

February 10, 2018

January 10, 2018
Recently, we theoretically showed how to realize twocomponent fractional quantum Hall phases in monolayer graphene by optically driving the system. A laser is tuned into resonance between two Landau levels, giving rise to an effective tunneling between these two synthetic layers.

November 22, 2017
Topology plays a central role in the modern condensed matter, quantum information and highenergy physics. Certain Geometric manipulation of the manifold which supports a particular topological, known as the modular transformations, can be used as faulttolerant logical operations in the context of both topological phases and topological quantum error correction codes. We realized that such transformations can be implemented in a single shot (i.e., with constant circuit depth), using local transversal SWAP operations between patches in a folded system with twist defects (wormholes in the synthetic dimension).

August 06, 2017
A promising nearterm application of a quantum computer consisting of O(100) qubits is quantum simulation of fermionic systems, which exceeds the computational power of the world’s largest classical supercomputer due to the exponential growth of the Hilbertspace size. The target systems range from large molecules in quantum chemistry such as fertilizer made with lower energy cost, to strongly correlated electronic materials such as the notoriously difficult highTc superconductors. This killer app happens to coincide with Feynman’s original vision of universal quantum simulator, which uses a quantum system to simulate another and hence “fight fire with fire”.

June 01, 2016
Entanglement spectrum, the full spectrum of the reduced density matrix of a subsystem, plays a major role in characterising manybody quantum systems. In recent years, it has been widely studied in the fields of condensed matter physics, quantum information, high energy and blackhole physics.