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Updated: May 18, 2026
06:42
Generation and Coherent Control of Pulsed Quantum Frequency Combs
Published on: June 8, 2018
Coherent error suppression in multiqubit entangling gates.
D Hayes1, S M Clark, S Debnath
1Joint Quantum Institute and Department of Physics, University of Maryland, College Park, Maryland 20742, USA. dhayes12@umd.edu
Physical Review Letters
|October 4, 2012
Summary
We developed a pulse shaping method to boost the accuracy of entangling gates in trapped ion quantum computers. This technique, Walsh modulation, significantly reduces errors from frequency and timing imperfections.
Area of Science:
- Quantum Information Science
- Atomic Physics
- Quantum Computing
Background:
- Trapped ion systems are leading platforms for quantum computation.
- Entangling gates, like the Mølmer-Sørensen gate, are crucial for quantum operations.
- Gate fidelity is often limited by experimental imperfections such as frequency and timing errors.
Purpose of the Study:
- To present a novel pulse shaping technique for enhancing the fidelity of spin-dependent force operations.
- To improve the performance of entangling gates in trapped ion systems.
- To provide a method applicable to various qubit systems coupled via harmonic modes.
Main Methods:
- Demonstration of a simple pulse shaping technique.
- Utilizing Walsh modulation of the control laser pulses.
- Implementation of a two-qubit entangling gate on trapped atomic ions.
Main Results:
- The pulse shaping technique theoretically suppresses frequency and timing errors to any desired order.
- Experimental demonstration shows improved fidelity of the entangling gate.
- The method is shown to be robust against common experimental noise sources.
Conclusions:
- The demonstrated pulse shaping technique offers a significant improvement for trapped ion quantum computing.
- This method provides a scalable approach to enhance gate fidelity in systems with collective harmonic coupling.
- The technique is broadly applicable to various qubit platforms relying on similar coupling mechanisms.
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