Connor Hart

QTC Scientist

Ph.D. Physics, Harvard University, 2020
B.S. Physics, University of Maryland, College Park, 2015

Connor’s research focuses on the development of quantum sensors based on nitrogen vacancy center defects in diamond for applications such as bulk vector magnetometry and wide-field magentic imaging. In particular, he pursues, in close collaboration with others in the group, the realization of techniques to improve NV-diamond magnetic sensitivity and robustness against material, environmental, and experimental imperfections. His graduate work has also included the development of NV-based characterization techniques to better inform the development of diamond material tailored to magnetic sensing applications.

Notable Publications

  • Beyond average Hamiltonian theory for quantum sensing. Jner Tzern Oon, Sebastian C. Carrasco, Connor A. Hart, George A. Witt, Vladimir S. Malinovsky, and Ronald Walsworth. Phys. Rev. Res. 8, 013222 (2026). link PDF
    BibTeX
    arXiv

  • All-optical photoluminescence response of nitrogen-vacancy ensembles in diamond at low magnetic fields. Xiechen Zheng, Jeyson Támara-Isaza, Zechuan Yin, Johannes Cremer, John W. Blanchard, Connor A. Hart, Michael Crescimanno, Paul V. Petruzzi, Matthew J. Turner, and Ronald L. Walsworth. Phys. Rev. Appl. 24, 064049 (2025). link PDF
    BibTeX
    arXiv
  • Characterization of low-nitrogen quantum diamond for pulsed magnetometry applications. Jiashen Tang, Connor A. Roncaioli, Andrew M. Edmonds, Atli Davidsson, Connor A. Hart, Matthew L. Markham, and Ronald L. Walsworth. Frontiers in Quantum Science and Technology Volume 4 - 2025 (2025). link PDF supplement
    BibTeX
    arXiv
  • High-resolution and wide-frequency-range magnetic spectroscopy with solid-state spin ensembles. Zechuan Yin, Justin J. Welter, Connor A. Hart, Paul V. Petruzzi, and Ronald L. Walsworth. npj Quantum Information 11 (2025). link PDF supplement
    BibTeX
    arXiv
  • AC magnetometry in the strong drive regime with NV centers in diamond. Katrijn Everaert, Saipriya Satyajit, Jiashen Tang, Zechuan Yin, Xiechen Zheng, Jner Tzern Oon, Connor A. Hart, John W. Blanchard, and Ronald L. Walsworth. arXiv:2510.05471v1 (2025). PDF
    BibTeX
    arXiv

  • All-in-one quantum diamond microscope for sensor characterization. Connor Roncaioli, Connor A. Hart, Ronald Walsworth, and Donald P. Fahey. AVS Quantum Science 6, 044403 (2024). link PDF supplement
    BibTeX
    arXiv
  • Quantum diamond microscope for narrowband magnetic imaging with high spatial and spectral resolution. Zechuan Yin, Jiashen Tang, Connor A. Hart, John W. Blanchard, Xinyan Xiang, Saipriya Satyajit, Smriti Bhalerao, Tao Tao, Stephen J. DeVience, and Ronald L. Walsworth. Phys. Rev. Appl. 22, 054050 (2024). link PDF
    BibTeX
    arXiv

  • Quantum diamond microscope for dynamic imaging of magnetic fields. Jiashen Tang, Zechuan Yin, Connor A. Hart, John W. Blanchard, Jner Tzern Oon, Smriti Bhalerao, Jennifer M. Schloss, Matthew J. Turner, and Ronald L. Walsworth. AVS Quantum Science 5, 044403 (2023). link PDF
    BibTeX
    arXiv
  • Quantum Logic Enhanced Sensing in Solid-State Spin Ensembles. Nithya Arunkumar, Kevin S. Olsson, Jner Tzern Oon, Connor A. Hart, Dominik B. Bucher, David R. Glenn, Mikhail D. Lukin, Hongkun Park, Donhee Ham, and Ronald L. Walsworth. Phys. Rev. Lett. 131, 100801 (2023). link PDF supplement
    BibTeX
    arXiv

  • Ramsey envelope modulation in NV diamond magnetometry. Jner Tzern Oon, Jiashen Tang, Connor A. Hart, Kevin S. Olsson, Matthew J. Turner, Jennifer M. Schloss, and Ronald L. Walsworth. Phys. Rev. B 106, 054110 (2022). link PDF supplement
    BibTeX
    arXiv
  • High-Precision Mapping of Diamond Crystal Strain Using Quantum Interferometry. Mason C. Marshall, Reza Ebadi, Connor Hart, Matthew J. Turner, Mark J.H. Ku, David F. Phillips, and Ronald L. Walsworth. Phys. Rev. Applied 17, 024041 (2022). link PDF
    BibTeX
    arXiv
  • Multiplexed Sensing of Magnetic Field and Temperature in Real Time Using a Nitrogen-Vacancy Ensemble in Diamond. Jeong Hyun Shim, Seong-Joo Lee, Santosh Ghimire, Ju Il Hwang, Kwang-Geol Lee, Kiwoong Kim, Matthew J. Turner, Connor A. Hart, Ronald L. Walsworth, and Sangwon Oh. Phys. Rev. Applied 17, 014009 (2022). link PDF supplement
    BibTeX
    arXiv

  • Characterisation of CVD diamond with high concentrations of nitrogen for magnetic-field sensing applications. Andrew Mark Edmonds, Connor A Hart, Matthew J Turner, Pierre-Olivier Colard, Jennifer M Schloss, Kevin Olsson, Raisa Trubko, Matthew L Markham, Adam Rathmill, Ben Horne-Smith, Wilbur Lew, Arul Manickam, Scott Bruce, Peter G Kaup, Jon C Russo, Michael J DiMario, Joseph T South, Jay T Hansen, Daniel J Twitchen, and Ronald Walsworth. Materials for Quantum Technology 1, 025001 (2021). link PDF
    BibTeX
  • N–V–Diamond Magnetic Microscopy Using a Double Quantum 4-Ramsey Protocol. Connor A. Hart, Jennifer M. Schloss, Matthew J. Turner, Patrick J. Scheidegger, Erik Bauch, and Ronald L. Walsworth. Phys. Rev. Applied 15, 044020 (2021). link PDF supplement
    BibTeX
    arXiv

  • Decoherence of ensembles of nitrogen-vacancy centers in diamond. Erik Bauch, Swati Singh, Junghyun Lee, Connor A. Hart, Jennifer M. Schloss, Matthew J. Turner, John F. Barry, Linh M. Pham, Nir Bar-Gill, Susanne F. Yelin, and Ronald L. Walsworth. Phys. Rev. B 102, 134210 (2020). link PDF
    BibTeX
    arXiv
  • Microwave-Assisted Spectroscopy Technique for Studying Charge State in Nitrogen-Vacancy Ensembles in Diamond. D.P.L. Aude Craik, P. Kehayias, A.S. Greenspon, X. Zhang, M.J. Turner, J.M. Schloss, E. Bauch, C.A. Hart, E.L. Hu, and R.L. Walsworth. Physical Review Applied 14, 014009 (2020). link PDF
    BibTeX
    arXiv
  • Generation of nitrogen-vacancy ensembles in diamond for quantum sensors: Optimization and scalability of CVD processes. Andrew M. Edmonds, Connor A. Hart, Matthew J. Turner, Pierre-Olivier Colard, Jennifer M. Schloss, Kevin Olsson, Raisa Trubko, Matthew L. Markham, Adam Rathmill, Ben Horne-Smith, Wilbur Lew, Arul Manickam, Scott Bruce, Peter G. Kaup, Jon C. Russo, Michael J. DiMario, Joseph T. South, Jay T. Hansen, Daniel J. Twitchen, and Ronald L. Walsworth. arXiv:2004.01746 [cond-mat, physics:quant-ph] (2020). PDF
    BibTeX
    arXiv
  • Sensitivity optimization for NV-diamond magnetometry. John F. Barry, Jennifer M. Schloss, Erik Bauch, Matthew J. Turner, Connor A. Hart, Linh M. Pham, and Ronald L. Walsworth. Reviews of Modern Physics 92, 015004 (2020). link PDF
    BibTeX
    arXiv

  • Imaging crystal stress in diamond using ensembles of nitrogen-vacancy centers. P. Kehayias, M. J. Turner, R. Trubko, J. M. Schloss, C. A. Hart, M. Wesson, D. R. Glenn, and R. L. Walsworth. Physical Review B 100, 174103 (2019). link PDF supplement
    BibTeX
    arXiv
  • Principles and techniques of the quantum diamond microscope. Edlyn V. Levine, Matthew J. Turner, Pauli Kehayias, Connor A. Hart, Nicholas Langellier, Raisa Trubko, David R. Glenn, Roger R. Fu, and Ronald L. Walsworth. Nanophotonics 8, 1945–1973 (2019). link PDF
    BibTeX
  • Decoherence of dipolar spin ensembles in diamond. Erik Bauch, Swati Singh, Junghyun Lee, Connor A. Hart, Jennifer M. Schloss, Matthew J. Turner, John F. Barry, Linh Pham, Nir Bar-Gill, Susanne F. Yelin, and Ronald L. Walsworth. arXiv:1904.08763 [physics, physics:quant-ph] (2019). PDF
    BibTeX
    arXiv

  • Ultralong Dephasing Times in Solid-State Spin Ensembles via Quantum Control. Erik Bauch, Connor A. Hart, Jennifer M. Schloss, Matthew J. Turner, John F. Barry, Pauli Kehayias, Swati Singh, and Ronald L. Walsworth. Physical Review X 8, 031025 (2018). link PDF supplement
    BibTeX
    arXiv