Official websites use .gov
A .gov website belongs to an official government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.
Alejandra Collopy (Fed)
Physicist
Alejandra is a staff scientist in the Time Realization and Distribution group. She works on the timescale (an ensemble of atomic clocks) that generates the NIST realization of UTC, yielding the official US timing signals. Additionally, she works on developing an atomic optical frequency reference based on singly trapped strontium ions. This frequency reference aims to support the timescale as a high uptime optical standard for frequency calibration. Her education includes a B.S in physics from Stanford University and Ph.D. work at JILA (University of Colorado Boulder) under Professor Jun Ye implementing a magneto optical trap of diatomic YO molecules (2018). During her postdoctoral years she worked at NIST as an NRC research associate and later as a term employee in the Ion Storage group on experiments involving quantum logic spectroscopy, both for precision molecular spectroscopy and towards high-fidelity gates for scalable quantum computing (2018-2023).