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IQIM Postdoctoral and Graduate Student Seminar

Friday, October 11, 2019
12:00pm to 1:00pm
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East Bridge 201 (Richard P. Feynman Lecture Hall)
Towards quantum information processing with arrays of Rydberg atoms
Hannes Pichler, Moore Postdoctoral Scholar in Theoretical Physics,

Note: This week only, lunch will be provided at noon on the lawn outside E. Bridge. The seminar talk will begin at ~12:25 in 201 E. Bridge.

Abstract: Individually trapped neutral atoms provide a promising platform to engineer quantum many-body systems in a controlled, bottom-up approach. They can be readily manipulated in large numbers and interact strongly when excited to Rydberg states. In this talk I will discuss different approaches to use such systems for quantum information processing tasks.

First, I will review the basic physics of arrays of Rydberg atoms, and show that such systems are naturally related to certain combinatorial optimization problems. In particular, I will show that one can encode the solution to maximum independent set problems in the ground state of properly positioned atoms. This allows to directly implement various quantum optimization algorithms with no experimental overhead and study their performance for system sizes that can’t be simulated on classical computers.

In the second part of this talk I will focus on digital approaches to quantum computing with Rydberg atoms. In particular, I will introduce a new protocol for realizing fast multi-qubit gates between individual neutral atoms, based on the Rydberg blockade mechanism. I will report on the corresponding experimental implementation of the controlled-phase gate with fidelity ≥ 97.4(3)%, representing the highest fidelity entangling gates based on Rydberg interactions achieved so far.

For more information, please contact Marcia Brown by phone at 626-395-4013 or by email at