Mark Ku

Assistant Professor Physics, University of Deleware, and QTC Affiliate Scientist

Ph.D. Physics, Massachusetts Institute of Technology, 2015
M.S. Physics, University of British Columbia, 2009
B.S. Physics, University of British Columbia, 2007

Mark’s research focuses on probing condensed matter physics with quantum diamond sensors and technology development for various quantum diamond applications.

mku@udel.edu

Personal Website

Fun Fact: Mark has a black belt in mixed martial arts and claims that if he didn’t do physics he would pursue a career as a UFC fighter!

Notable Publications

Machine learning for improved current-density reconstruction from two-dimensional vector magnetic images. Niko R. Reed, Danyal Bhutto, Matthew J. Turner, Declan M. Daly, Sean M. Oliver, Jiashen Tang, Kevin S. Olsson, Nicholas Langellier, Mark J.H. Ku, Matthew S. Rosen, and Ronald L. Walsworth. Phys. Rev. Appl. 23, 034035 (2025). link PDF
BibTeX
@article{REED2025, sort_date = {2025-03-17}, sort_date_type = {journal-publication}, title = {Machine learning for improved current-density reconstruction from two-dimensional vector magnetic images}, author = {Reed, Niko R. and Bhutto, Danyal and Turner, Matthew J. and Daly, Declan M. and Oliver, Sean M. and Tang, Jiashen and Olsson, Kevin S. and Langellier, Nicholas and Ku, Mark J.H. and Rosen, Matthew S. and Walsworth, Ronald L.}, journal = {Phys. Rev. Appl.}, volume = {23}, issue = {3}, pages = {034035}, numpages = {16}, year = {2025}, month = {Mar}, publisher = {American Physical Society}, doi = {10.1103/PhysRevApplied.23.034035}, day = {17}, url_link = {https://link.aps.org/doi/10.1103/PhysRevApplied.23.034035}, url_pdf = {/files/2025/03/2025_Reed_PRApplied.pdf}, keywords = {quantum-sensing, ml-agentic}, eprint = {2407.14553}, archiveprefix = {arXiv} }

arXiv

Diamond micro-chip for quantum microscopy. Shahidul Asif, Hang Chen, Johannes Cremer, Shantam Ravan, Jeyson Támara-Isaza, Saurabh Lamsal, Reza Ebadi, Yan Li, Ling-Jie Zhou, Cui-Zu Chang, John Q. Xiao, Amir Yacoby, Ronald L. Walsworth, and Mark J. H. Ku. AVS Quantum Science 6, 044405 (2024). link PDF supplement
BibTeX
@article{ASIF2024, sort_date = {2024-12}, sort_date_type = {journal-issue}, author = {Asif, Shahidul and Chen, Hang and Cremer, Johannes and Ravan, Shantam and T\'{a}mara-Isaza, Jeyson and Lamsal, Saurabh and Ebadi, Reza and Li, Yan and Zhou, Ling-Jie and Chang, Cui-Zu and Xiao, John Q. and Yacoby, Amir and Walsworth, Ronald L. and Ku, Mark J. H.}, title = {Diamond micro-chip for quantum microscopy}, journal = {AVS Quantum Science}, volume = {6}, number = {4}, pages = {044405}, year = {2024}, month = {12}, issn = {2639-0213}, doi = {10.1116/5.0223774}, url_link = {https://doi.org/10.1116/5.0223774}, url_pdf = {/files/2024/12/Diamond-Micro-Chip.pdf}, url_supplement = {/files/2024/12/DMC_SM_20240819_rev02_major.pdf}, keywords = {quantum-sensing}, eprint = {2403.10414}, archiveprefix = {arXiv} }

arXiv

Dressed-state control of effective dipolar interaction between strongly-coupled solid-state spins. Junghyun Lee, Mamiko Tatsuta, Andrew Xu, Erik Bauch, Mark J. H. Ku, and Ronald L. Walsworth. npj Quantum Information 9, 77 (2023). link PDF supplement
BibTeX
@article{Lee2023_b, sort_date = {2023-08-01}, sort_date_type = {journal-publication}, author = {Lee, Junghyun and Tatsuta, Mamiko and Xu, Andrew and Bauch, Erik and Ku, Mark J. H. and Walsworth, Ronald L.}, title = {Dressed-state control of effective dipolar interaction between strongly-coupled solid-state spins}, journal = {npj Quantum Information}, year = {2023}, month = {Aug}, day = {01}, volume = {9}, number = {1}, pages = {77}, issn = {2056-6387}, doi = {10.1038/s41534-023-00743-3}, url_link = {https://doi.org/10.1038/s41534-023-00743-3}, url_pdf = {/files/2023/08/2023_b_Lee_npj_Quantum_Information.pdf}, keywords = {quantum-sensing}, url_supplement = {/files/2023/08/2023_b_Lee_npj_Quantum_Information_sup.pdf}, eprint = {2203.07610}, archiveprefix = {arXiv} }

arXiv
Controllable tunability of a Chern number within the electronic-nuclear spin system in diamond. Junghyun Lee, Keigo Arai, Huiliang Zhang, Mark J. H. Ku, and Ronald L. Walsworth. npj Quantum Information 9, 66 (2023). link PDF supplement
BibTeX
@article{Lee2023, sort_date = {2023-07-08}, sort_date_type = {journal-publication}, author = {Lee, Junghyun and Arai, Keigo and Zhang, Huiliang and Ku, Mark J. H. and Walsworth, Ronald L.}, title = {Controllable tunability of a Chern number within the electronic-nuclear spin system in diamond}, journal = {npj Quantum Information}, year = {2023}, month = {Jul}, day = {08}, volume = {9}, number = {1}, pages = {66}, issn = {2056-6387}, doi = {10.1038/s41534-023-00732-6}, url_link = {https://doi.org/10.1038/s41534-023-00732-6}, url_pdf = {/files/2023/07/2023_Lee_npj_Quantum_Information.pdf}, keywords = {quantum-sensing}, url_supplement = {/files/2023/07/2023_Lee_npj_Quantum_Information_sup.pdf}, eprint = {2211.13438}, archiveprefix = {arXiv} }

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
@article{Marshall2022, sort_date = {2022-02-15}, sort_date_type = {journal-publication}, title = {High-Precision Mapping of Diamond Crystal Strain Using Quantum Interferometry}, author = {Marshall, Mason C. and Ebadi, Reza and Hart, Connor and Turner, Matthew J. and Ku, Mark J.H. and Phillips, David F. and Walsworth, Ronald L.}, journal = {Phys. Rev. Applied}, volume = {17}, issue = {2}, pages = {024041}, numpages = {15}, year = {2022}, month = {Feb}, comment = {02}, publisher = {American Physical Society}, doi = {10.1103/PhysRevApplied.17.024041}, url_link = {https://link.aps.org/doi/10.1103/PhysRevApplied.17.024041}, url_pdf = {/files/2020/08/2022_Marshall_PRApp.pdf}, keywords = {quantum-sensing, fundamental-phys}, eprint = {2108.00304}, archiveprefix = {arXiv} }

arXiv

Scanning X-Ray Diffraction Microscopy for Diamond Quantum Sensing. Mason C. Marshall, David F. Phillips, Matthew J. Turner, Mark J. H. Ku, Tao Zhou, Nazar Delegan, F. Joseph Heremans, Martin V. Holt, and Ronald L. Walsworth. Phys. Rev. Applied 16, 054032 (2021). link PDF supplement
BibTeX
@article{Marshall2021_d, sort_date = {2021-11-16}, sort_date_type = {journal-publication}, title = {Scanning X-Ray Diffraction Microscopy for Diamond Quantum Sensing}, author = {Marshall, Mason C. and Phillips, David F. and Turner, Matthew J. and Ku, Mark J. H. and Zhou, Tao and Delegan, Nazar and Heremans, F. Joseph and Holt, Martin V. and Walsworth, Ronald L.}, journal = {Phys. Rev. Applied}, volume = {16}, issue = {5}, pages = {054032}, numpages = {12}, year = {2021}, month = {Nov}, comment = {11}, publisher = {American Physical Society}, doi = {10.1103/PhysRevApplied.16.054032}, url_link = {https://link.aps.org/doi/10.1103/PhysRevApplied.16.054032}, url_pdf = {/files/2020/08/2021_Marshall_PRA.pdf}, url_supplement = {/files/2020/08/2021_Marshall_PRA_Supp.pdf}, keywords = {quantum-sensing, fundamental-phys}, eprint = {2103.08388}, archiveprefix = {arXiv} }

arXiv
Directional detection of dark matter with diamond. Mason C Marshall, Matthew J Turner, Mark J H Ku, David F Phillips, and Ronald L Walsworth. Quantum Science and Technology 6, 024011 (2021). link PDF
BibTeX
@article{Marshall2021, eprint = {2009.01028}, archiveprefix = {arXiv}, sort_date = {2021-04}, sort_date_type = {journal-issue}, doi = {10.1088/2058-9565/abe5ed}, year = {2021}, month = {Mar}, comment = {03}, publisher = {{IOP} Publishing}, volume = {6}, number = {2}, pages = {024011}, author = {Mason C Marshall and Matthew J Turner and Mark J H Ku and David F Phillips and Ronald L Walsworth}, title = {Directional detection of dark matter with diamond}, journal = {Quantum Science and Technology}, url_pdf = {/files/2020/08/2021_Marshall_IOPScience-1.pdf}, url_link = {https://doi.org/10.1088/2058-9565/abe5ed}, keywords = {quantum-sensing, fundamental-phys} }

arXiv

Imaging viscous flow of the Dirac fluid in graphene. Mark J. H. Ku, Tony X. Zhou, Qing Li, Young J. Shin, Jing K. Shi, Claire Burch, Laurel E. Anderson, Andrew T. Pierce, Yonglong Xie, Assaf Hamo, Uri Vool, Huiliang Zhang, Francesco Casola, Takashi Taniguchi, Kenji Watanabe, Michael M. Fogler, Philip Kim, Amir Yacoby, and Ronald L. Walsworth. Nature 583, 537–541 (2020). link PDF supplement
BibTeX
@article{Ku2020, eprint = {1905.10791}, archiveprefix = {arXiv}, sort_date = {2020-07-23}, sort_date_type = {journal-issue}, author = {Ku, Mark J. H. and Zhou, Tony X. and Li, Qing and Shin, Young J. and Shi, Jing K. and Burch, Claire and Anderson, Laurel E. and Pierce, Andrew T. and Xie, Yonglong and Hamo, Assaf and Vool, Uri and Zhang, Huiliang and Casola, Francesco and Taniguchi, Takashi and Watanabe, Kenji and Fogler, Michael M. and Kim, Philip and Yacoby, Amir and Walsworth, Ronald L.}, title = {Imaging viscous flow of the {Dirac} fluid in graphene}, journal = {Nature}, year = {2020}, volume = {583}, number = {7817}, pages = {537--541}, month = {jul}, comment = {07}, doi = {10.1038/s41586-020-2507-2}, keywords = {quantum-sensing}, url_link = {https://www.nature.com/articles/s41586-020-2507-2}, url_pdf = {/files/2020/08/2020_Ku_Nature.pdf}, url_supplement = {/files/2020/08/2020_Ku_Nature_SM.pdf} }

arXiv
Spin-torque oscillation in a magnetic insulator probed by a single-spin sensor. H. Zhang, M. J. H. Ku, F. Casola, C. H. R. Du, T. van der Sar, M. C. Onbasli, C. A. Ross, Y. Tserkovnyak, A. Yacoby, and R. L. Walsworth. Physical Review B 102, 024404 (2020). link PDF
BibTeX
@article{Zhang2020, eprint = {1810.07306}, archiveprefix = {arXiv}, sort_date = {2020-07-02}, sort_date_type = {journal-publication}, author = {Zhang, H. and Ku, M. J. H. and Casola, F. and Du, C. H. R. and van der Sar, T. and Onbasli, M. C. and Ross, C. A. and Tserkovnyak, Y. and Yacoby, A. and Walsworth, R. L.}, title = {Spin-torque oscillation in a magnetic insulator probed by a single-spin sensor}, journal = {Physical Review B}, year = {2020}, volume = {102}, number = {2}, pages = {024404}, month = {jul}, comment = {07}, doi = {10.1103/PhysRevB.102.024404}, keywords = {quantum-sensing}, url_link = {https://link.aps.org/doi/10.1103/PhysRevB.102.024404}, url_pdf = {/files/2020/08/2020_Zhang_PRB.pdf} }

arXiv

Mark Ku

2025

2024

2023

2022

2021

2020