My group uses atoms and molecules to develop new tools for precision measurements. Our current research projects involve optical atomic clocks and molecular 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+ optical clocks, arXiv (2019)
  3. A measurement of the atomic hydrogen Lamb shift and the proton charge radius, Science (2019)
  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)
  7. Doppler and collisional frequency shifts in trapped-atom clocks, arXiv (2018)
  8. Orientation-dependent hyperfine structure of polar molecules in a rare-gas matrix, Phys. Rev. A (2018)
  9. Laser frequency stabilization using a transfer interferometer, Rev. Sci. Intr. (2018)
  10. Displacement operators: the classical face of their quantum phase, Eur. J. Phys. (2018)
  11. A compact external-cavity diode laser, using feedback from an optical fiber, Rev. Sci. Instr. (2017)
  12. Collisional frequency shift of a trapped-ion optical clock, Phys. Rev. A (2017)

Selected older publications

  1. Frequency-offset separated oscillatory fields, Phys. Rev. A (2015)
  2. Optical frequency standards for gravitational wave detection using satellite Doppler velocimetry, New. J. Phys. (2015)
  3. Mercury monohalides: Suitability for electron electric dipole moment searches, Phys. Rev. Lett. (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)


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
  • Monica Zhu
  • Kaitlyn Liang


  • 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