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Generation and Coherent Control of Pulsed Quantum Frequency Combs
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Robust quantum state engineering through coherent localization in biased-coin quantum walks.

Helena Majury1,2, Joelle Boutari3, Elizabeth O'Sullivan1

  • 11Centre for Secure Information Technologies (CSIT), Queen's University, Belfast, BT7 1NN United Kingdom.

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|June 11, 2019
PubMed
Summary

Quantum walks generate non-classical position states using coherent localization. This method is robust against noise and parameter variations, with a feasible linear-optics implementation.

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Area of Science:

  • Quantum physics
  • Quantum information science

Background:

  • Quantum walks are essential for quantum computation.
  • Generating non-classical states is crucial for quantum technologies.

Purpose of the Study:

  • To explore quantum walks for generating non-classical position states.
  • To engineer large-size coherent superpositions of quantum walker states.

Main Methods:

  • Utilizing coin-biased quantum walks.
  • Exploiting coherent localization in position space.
  • Employing post-selection techniques.
  • Investigating robustness against parameter variations and dephasing noise.

Main Results:

  • Successfully engineered large-size coherent superpositions of position states.
  • Demonstrated robustness of the protocol against parameter drift and dephasing noise.
  • Proposed a linear-optics implementation for bulk and integrated platforms.

Conclusions:

  • Coin-biased quantum walks are effective for generating non-classical states.
  • The proposed method offers a robust approach for quantum state engineering.
  • Linear-optics platforms provide a viable route for experimental realization.