Ng Hui Khoon Group

The biggest obstacle to the successful implementation of useful quantum information and computation devices is noise. The quantum effects — quantum coherence, quantum correlations, etc. — that give quantum systems an edge over classical ones are highly fragile and require intricate care for their preservation. Noise-suppression techniques, including dynamical decoupling, error correction, and fault tolerance, have seen much progress over the years, with many creative ideas contributing to the overall theoretical confidence in our ability to tackle noise. Yet, many of these strategies, especially those of error correction, remain difficult to achieve in the lab.

Our group studies the effects of noise and its mitigation via quantum error correction and fault tolerance. We seek a better understanding of the characteristics of noise relevant in quantum computational systems, and attempt to narrow the current gap between theoretical proposals of noise mitigation and practical implementations. This includes, among other variations on the same theme, the tomography of noise parameters useful for assessing the strength and type of noise present in the system, the study of how one might verify assumptions in theoretical fault-tolerance proofs, and the feasibility comparison of current noise mitigation schemes

For details on on-going projects, please refer to the group page:

More information at our homepage:

Our group studies aspects of noise mitigation in quantum information and computation, focusing on quantum error correction and fault tolerance, as well as the tomography and characterization of noise.

Group Members

Recent papers

  • L.Y. Len, H.K. Ng. (2018). Open-System Quantum Error Correction. Phys. Rev. A 98 022037
  • YC.Zheng, H.K. Ng. (2017). Digital quantum simulator in the presence of a bath. Phys. Rev. A 96 042329
  • M. Trappe, L.Y. Len, H.K. Ng, B.-G. Englert. (2017). Airy-averaged gradient corrections for two-dimensional fermion gases. Ann. Phys. 385 136
  • B.-G. Englert, Kelvin Horia, J. Dai, L.Y. Len, H.K. Ng. (2017). Past of a quantum particle revisited. Phys. Rev. A 96 022126
  • J. Shang, Zhengyun Zhang, H.K. Ng. (2017). Superfast maximum likelihood reconstruction for quantum tomography. Phys. Rev. A 95 062336
  • Li Xikun, J. Shang, H.K. Ng, B.-G. Englert. (2016). Optimal error intervals for properties of the quantum state. Phys. Rev. A 94 062112
  • J. Dai, L.Y. Len, H.K. Ng. (2016). Initial system-bath state via the maximum-entropy principle. Phys. Rev. A 94 052112
more publications >