| INTRODUCTION | WHAT's NEW |
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We study the physical foundation of future information technologies, namely, how to produce, protect, process, and probe coherence of quantum systems, such as spins in solid-state materials, with potential applications in quantum sensing, quantum computing, optical communications, and spintronics. The specific physical systems under consideration include semiconductor quantum dots, defects in solids (nitrogen-vacancy centers in diamond, donors in silicon, radicals in organic crystals, etc.), topological insulators, and cold atoms in optical fields. |
22 Nov 2020 Quantum sensing can not only enhance exisiting metrology technology, but also enable new ones that have no classical counterparts [Express Letter of Chinese Physics Letters] [PDF]
13 Mar 2020 Physical Review A publishes our study on the Majorana representation of three-qubit tangle
2 Aug 2019 New Journal of Physics publishes our discovery that there is no singular sensitivity enhancement at the excitional point of a non-Hermitian system
1 Aug 2019 Physical Review Letters publishes our paper "Characterization of Arbitrary-Order Correlations in Quantum Baths by Weak Measurement"
22 Jul 2019 Nature Communications publishes our paper "Nanometer-precision non-local deformation reconstruction using nanodiamond sensing"
22 Mar 2019 Nature Communications publishes our work on quantum control of nitrogen-vacancy spins at temperature near 1000 K
05 Feb 2019 Nature Communications publishes our paper "High-resolution spectroscopy of single nuclear spins via sequential weak measurements"
09 Aug 2018 Nature Communications publishes our paper "Hybrid nanodiamond quantum sensors enabled by volume phase transitions of hydrogels"
13 Jul 2018 Physical Review A publishes our paper on phase transitions in sequential weak measurement.
15 Mar 2018 Physical Review X publishes our ob servation of phase transition of a single magnetic nanoparticle and demonstration of magnetic criticality enhanced nanothermometer with 11 mK/sqrt{Hz} sensitivity.
13 Apr 2017 Physical Review Letters publishes our work on single-shot readout of a weakly coupled nuclear spin, in collaboration with Pan Xinyu group
23 Nov 2016 Physical Review Applied publishes our 2D quantum sensing scheme for nuclear correlation spectroscopy of single molecules
Postdoctoral positions available
PhD & MPhil positions available
4 Nov 2016 Reports on Progress in Physics publishes our review on central spin decoherence in nuclear spin baths
26 Aug 2016 Physical Review Applied publishes our quantum sensing scheme for resolving correlations of nuclear spins in single molecules
2 Jun 2016 Physical Review Letters publishes our scheme of topological Fock-state lattices
25 Apr 2016 Physical Review Applied publishes our scheme of 3D positioning with multiple NV centers
2 Apr 2016 Welcome to Dr. WANG Ping
29 Oct 2015 Nature Photonics highlights our work on "Diamond Maser".
19 Oct 2015 Scientific Reports published our discovery of "Thermodynamic Holography".
8 Oct 2015 Physical Review B published, in Rapid Communication, as Editor's Suggestion, our work addressing quantum/classical nature of a nuclear spin bath, done in collabration with John Morton's group.
23 Sep 2015 Nature Communications published our "Proposal for a room-temperature diamond maser".
6 Aug 2015 Optica published our paper "Topological phase transitions in superradiance lattices" as a Cover story.
16 July 2015 Scientific Reports published our paper "Geometric diffusion of quantum trajectories"
18 May 2015 Postdoctoral positions are available. Click for details
27 Jan 2015 Physical Review Letters published our paper "Superradiance Lattice"
5 Jan 2015 Observation of Lee-Yang zeros published in Physical Review Letters and highlighted in Physics
29 Dec 2014 Physical Review B published our paper "Nonlinear optical response induced by non-Abelian Berry curvature in time-reversal-invariant insulators".
24 Sep 2014 Nature Communications published our paper "Theory of low-power ultra-broadband terahertz sideband generation in bi-layer graphene".
10 Sep 2014 Nature Communications published our paper "Uncovering many-body correlations in nanoscale nuclear spin baths by central spin decoherence".
1 Aug 2014 Dr. Gangqin Liu and Ms. Ning Wang joined our experimental group. Welcome, Gangqin and Ning.
6 Jun 2014 Scientific Reports published our paper "Phase transitions in the complex plane of physical parameters".
16 Apr 2014 New Journal of Physics published our paper "Giant Faraday rotation induced by the Berry phase in bilayer graphene under strong terahertz fields".
15 Apr 2014 Scientific Reports published our proposal for Faraday rotation echo spectroscopy.
25 Mar 2014 Physical Review B published our discovery of secondary THz sideband plateau as Rapid Communication.
24 Nov 2013 Nature Physics published our work on sensing and structure analysis of single nuclear spin clusters - a step toward single-molecule NMR.
12 Nov 2013 New Journal of Physics published our our prediction of Faraday rotation caused by Berry phases of quantum trajectories in THz field driven semiconductors.
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RESEARCH HIGHLIGHTS
 Cover Story - topological quantum optics. Atoms coupled to different optical fields form a Superradiance Lattice in momentum space (PRL 2015). Under three lights periodically modulated with different phases, the SL simulates the famous Haldane model for 2D topological insulators (Optica 2015). Such lattices can be employed for generation of Schrodinger cat states of photons (PRL 2016). The topological properties of SLs extend topological physics to quantum optics. |
 Central spin decoherence is deeply related to partition function of environment: The coherence zeros correspond to Lee-Yang zeros and a new type of phase transitions - time-domain phase transitions correspond to the singularities in the complex plane of physical parameters. [Phys. Rev. Lett. (2012)] After more than 60 years of their theoretical studies, Lee-Yang zeros now observed [Phys. Rev. Lett. (2015), highlighted in Physics]. |
 Light for trillion-bit rate communication: Following our prediction, we observed up to 11 colors generated from a monochromatic light through a semiconductor irradiated by a strong THz laser [Nature 2012]. The figure is by R. Huber [News & Views, Nature]. Graphene may be a more efficient material for high-order THz sideband generation [Nature Communications 2014] |
 Magnetometry: Spin coherence of a nitrogen-vacancy center in diamond can be used to identify distant nuclear spin pairs and detect NMR of single molecules Nature Nanotech.(2011). The idea has been partially realized by experiments [Nature Nanotech. (2012), Nature Phys. (2014)] |