Group Members

Photo of <a href='/members/hartmut/'>Hartmut Häffner</a>

Hartmut Häffner

Office Location: 301H, Physics South
Office Phone: (510) 664-4299
Lab Phone: (510) 664-4296

I like to experiment with the quantum information stored in trapped ions. I lead now a group sharing the same passion. In my previous life, I measured how strong electric fields change the magnetic moment of the electron, studied quantum chaos, ran quantum gates, characterized entangled states, and teleported quantum information over 10 micrometers. Notable current achievements of my group are ultra low-noise ion traps and a Michelson-Morley test for electrons. When not behind a keyboard, I love being outside such as on playgrounds with my daughters or on the water windsurfing.

Sara Wexler

Administrative Assistant

Photo of Neha Yadav

Neha Yadav


Photo of Elia Perego

Elia Perego


Photo of Alberto Alonso

Alberto Alonso


After working on antimatter spectroscopy with positronium atoms during my PhD, I am now interested in learning more about the extreme fidelity and control that can be attained with ion traps by manipulating single ions at a time, as well as the implications for fundamental physics and technological applications. I also enjoy playing boardgames, hiking, and videogames when I'm not in the lab.

Photo of Sumanta Khan

Sumanta Khan


After working with quantum optics experiments using vapor cells during my PhD, I am really excited to work on quantum information processing experiments using trapped ions. I am working on simulating a quantum system with trapped ions. Outside of the lab, I like roaming around the bay area, travelling, cooking, listening to music and watching TV series.

Photo of Joseph Broz

Joseph Broz

Grad Student

In Hartmut's lab I work with the only, legacy, 3D ion trap. The technical challenges are somewhat reduced from on-chip traps and so I am able to focus a little big more on the quantum information side of our research. I'm particularly interested in exploring the nontrivial and often nonintuitive dynamics that can arise in modestly sized but very precisely controlled and manipulated atomic systems.Outisde of the lab I enjoy boxing for the Berkeley team, trail running and walking my dog Lia!

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Neil Glikin

Grad Student

I love being able to see the effects of quantum mechanics on a tabletop, as well as just learning and discovering how the universe works. I enjoy exploring the bay area, video games, and making lists.

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Nicole Greene

Grad Student

Having previously worked on the local Lorentz invariance experiment, I now spend my time designing an apparatus that will soon shuttle and entangle large chains of ions. Outside the lab I enjoy exploring San Francisco, watching films, and skiing.

Photo of Ryan Shaffer

Ryan Shaffer

Grad Student

I spent several years programming classical computers before coming to Berkeley to study quantum computers. I'm most interested in the intersection of computer science with quantum information, and how to realize this in physical systems. I also enjoy some human things, like playing basketball, cooking, and traveling.

Photo of Qian Yu

Qian Yu

Grad Student

I'm interested in the physical realization of quantum computation and techniques of ion trapping, and I like to explore the quantum dynamics of strongly interacting systems including coherent evolution and decoherence. Outside the lab I like traveling, reading, cooking and playing board games.

Photo of Shuqi Xu

Shuqi Xu

Grad Student

My research interests lie in tackling challenges towards scalable trapped ion quantum computers, as well as the emergent physics revealed in such quantum system. When not in the lab, I enjoy traveling, playing video games, watching and playing soccer.

Photo of Ben Saarel

Ben Saarel

Grad Student

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Ryan Tollefsen

Grad Student

Photo of Justin Phillips

Justin Phillips

Grad Student

Photo of Isabel Sacksteder

Isabel Sacksteder

Grad Student

Photo of Hang Ren

Hang Ren

Grad Student

Current Visitors

Current Undergraduates

Group Alumni

Sara Mouradian Assistant Professor of ECE, University of Washington
Da An Systems Engineer at Aeva
Wei-Ting Chen  
Eli Megidish Physicist at Atom Computing
Clemens Matthiesen Senior Scientist at Oxford Ionics
Maya Berlin-Udi Materials Engineer at Cellino Biotech
Crystal Noel Assistant Professor of Physics, Duke University
Erik Urban Electrical Engineer at Exponent
Alex Chuang NSF Fellow, PhD Student at Massachusetts Institute of Technology
Boerge Hemmerling Assistant Professor of Physics, UC Riverside
Soenke Moeller Senior Research Engineer at Cutera
Dylan Gorman Physicist at Honeywell Quantum Solutions
Philipp Schindler Staff Scientist at Innsbruck University, Austria
Nikos Daniilidis Data Scientist at Credit Karma
Anthony Ransford Physicist at Honeywell Quantum Solutions, was PhD Student at UC Los Angeles
Michael Ramm Data Science Manager at Netflix
Thaned (Hong) Pruttivarasin Lecturer at Mahidol University, Thailand

Ishan Talukdar Brian Timar Thilo van Hoevel Ahmed Adelrahman  
Omid Khosravani Sankara Narayanan Josselin Bernardoff Christian Zimmer  
Ryan Blais Ross Hutson Charles Paul Kai Krimmel Lorenzo Leandro
Mark Kokish Sebastian Gerber Greg Bolloten Daniel Tatum Ian Hayes
Calvin Lau Axel Kreuter Oliver Neitzke Boyan Tabakov Sam Fendell
Kelsey Johnsen Nathan Poon Jiachen Yang Isabela Le Bras Todd Karin
Andy Li Cheong Yiu Chris Overstreet Gebhard Littich Sean Arifin David Gee
Christopher Reilly Alex Georges Jessica Yu Andre He Thomas Lloyd
Zhao Zhang Nadav Drechsler Lara Ostertag Samuel Cui Tim Guo
Simone Bibawi Simon Mayr Shijia Sun Sun Ximo  
Group photo 2018 Group photo 2017 Group photo fall 2015 Group photo spring 2015 Group photo 2014 Group photo 2013