Experimental measurement of the quantum geometric tensor using coupled qubits in diamond

Min Yu, Pengcheng Yang, Musang Gong, Qingyun Cao, Qiuyu Lu, Haibin Liu, Shaoliang Zhang, Martin B. Plenio, Fedor Jelezko, Tomoki Ozawa, Nathan Goldman, Jianming Cai

Research output: Contribution to journalArticlepeer-review

43 Citations (Scopus)


Geometry and topology are fundamental concepts, which underlie a wide range of fascinating physical phenomena such as topological states of matter and topological defects. In quantum mechanics, the geometry of quantum states is fully captured by the quantum geometric tensor. Using a qubit formed by an NV center in diamond, we perform the first experimental measurement of the complete quantum geometric tensor. Our approach builds on a strong connection between coherent Rabi oscillations upon parametric modulations and the quantum geometry of the underlying states. We then apply our method to a system of two interacting qubits, by exploiting the coupling between the NV center spin and a neighboring 13C nuclear spin. Our results establish coherent dynamical responses as a versatile probe for quantum geometry, and they pave the way for the detection of novel topological phenomena in solid state.

Original languageEnglish
Pages (from-to)254-260
Number of pages7
JournalNational Science Review
Issue number2
Publication statusPublished - 2020 Feb 1
Externally publishedYes


  • quantum control
  • quantum geometry
  • quantum information
  • quantum measurement
  • topological physics

ASJC Scopus subject areas

  • General


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