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. My students are developing the SORCE experiment.

nuts and bolts

Recent work

  1. Cold, dense, atomic ion clouds produced by cryogenic buffer-gas cooling, Phys. Rev. A (2019)
  2. Improved estimate of the collisional frequency shift in Al+ optical clocks, arXiv (2019)
  3. Magic polarization for light shift cancellation in two-photon optical clocks, Phys. Rev. A (2019)
  4. Doppler and collisional frequency shifts in trapped-atom clocks, arXiv (2018)
  5. Orientation-dependent hyperfine structure of polar molecules in a rare-gas matrix, Phys. Rev. A (2018)
  6. Laser frequency stabilization using a transfer interferometer, Rev. Sci. Intr. (2018)
  7. Oriented polar molecules for electron EDM measurements, Atoms (2018)
  8. Displacement operators: the classical face of their quantum phase, Eur. J. Phys. (2018)
  9. A compact external-cavity diode laser, using feedback from an optical fiber, Rev. Sci. Instr. (2017)
  10. Collisional frequency shift of a trapped-ion optical clock, Phys. Rev. A (2017)
  11. Broadband low-noise photodetector for Pound-Drever-Hall laser stabilization, Rev. Sci. Instr. (2016)
  12. Frequency-offset separated oscillatory fields, Phys. Rev. A (2015)
  13. Optical frequency standards for gravitational wave detection using satellite Doppler velocimetry, New. J. Phys. (2015)

Selected older publications

  1. Mercury monohalides: Suitability for electron electric dipole moment searches, Phys. Rev. Lett. (2015)
  2. Continuous all-optical deceleration and single-photon cooling of molecular beams, Phys. Rev. A (2014)
  3. Order of magnitude smaller limit on the electric dipole moment of the electron, Science (2014)
  4. Search for the electric dipole moment of the electron with thorium monoxide, J. Phys. B (2010)
  5. Geometric phases without geometry, arXiv (2009)


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
  • Henry Vu
  • Dr. Kosuke Kato

Kosuke, Edward, Mohit, Kristen, Henry, Shira


  • 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