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Generation and Coherent Control of Pulsed Quantum Frequency Combs
06:42

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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
PubMed
Summary
This summary is machine-generated.

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.

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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.