My group uses atoms and molecules to develop new tools for precision measurements, using two-photon optical atomic clocks and ion spectroscopy.

I am involved in the EDM3 and PolyEDM collaborations.

nuts and bolts

Recent work

  1. Electric dipole moment searches using polar molecule clock states, arXiv (2019)
  2. Improved estimate of the collisional frequency shift in Al+ clocks, Phys. Rev. Research (2019)
  3. A measurement of the atomic hydrogen Lamb shift and the proton charge radius, Science (2019)

    Perspective: Progress on the proton-radius puzzle

  4. Direct observation of a highly forbidden optical transition in Sm:SrF2, Phys. Rev. A (2019)
  5. Cold, dense, atomic ion clouds produced by cryogenic buffer-gas cooling, Phys. Rev. A (2019)
  6. Magic polarization for light shift cancellation in two-photon optical clocks, Phys. Rev. A (2019)

Selected older publications

  1. Collisional frequency shift of a trapped-ion optical clock, Phys. Rev. A (2017)
  2. Frequency-offset separated oscillatory fields, Phys. Rev. A (2015)
  3. Optical frequency standards for gravitational wave detection using satellite Doppler velocimetry, New. J. Phys. (2015)
  4. Order of magnitude smaller limit on the electric dipole moment of the electron, Science (2014)
  5. Search for the electric dipole moment of the electron with thorium monoxide, J. Phys. B (2010)

Full list:


Code and hardware designs developed in my group are freely available at

Pythagon is an older Python blog that I update sporadically.


Perhaps you are here for my list of content-free phrases?


I teach the following courses at UofT: Previous courses:


MP 033 (lab), MP 1121 (office)
Department of Physics
University of Toronto
60 St. George Street
Toronto ON M5S 1A7, Canada

Phone: +1 416 946 8503
Email: amar.vutha Ͽ

'MP' is the McLennan Physics building, located in UofT's downtown campus.



  • Shira Jackson
  • Nishant Bhatt
  • Mohit Verma
  • Kristen Cote
  • Dr. Kosuke Kato
  • Harish Ramachandran (u)
  • Monica Zhu (u)
  • Kaitlyn Liang (u)

CQIQC undergraduate summer fellowships are available: please apply before Jan 31, 2020.

NSERC USRA summer projects are also available: contact me if you are interested.


  • Luca Talamo → U Colorado
  • Jack Davis → U Waterloo
  • Hiromitsu Sawaoka → Harvard
  • Wesley Cassidy → U British Columbia
  • Dr. Shreyas Potnis → Thalmic Labs
  • Dr. Graham Edge → JW Player
  • Jenny Wu → U Colorado