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Generation and Coherent Control of Pulsed Quantum Frequency Combs
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Fast quantum control in dissipative systems using dissipationless solutions.

François Impens1, David Guéry-Odelin2,3

  • 1Instituto de Física, Universidade Federal do Rio de Janeiro, Rio de Janeiro, RJ, 21941-972, Brazil. impens@if.ufrj.br.

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|March 13, 2019
PubMed
Summary
This summary is machine-generated.

We developed a geometric method to control open quantum systems, mitigating dissipation effects for faster, more robust quantum operations. This technique optimizes population transfer and Bell state generation, even with noise.

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Area of Science:

  • Quantum Control
  • Open Quantum Systems
  • Geometric Methods

Background:

  • Dissipation significantly impacts the control of open quantum systems, leading to errors and reduced fidelity.
  • Standard control methods often struggle to maintain coherence and achieve precise operations in the presence of environmental noise.

Purpose of the Study:

  • To develop a systematic geometric procedure to mitigate dissipation effects in controlling open quantum systems.
  • To provide an analytical method for compensating dissipation-induced geometric distortions in spin systems.
  • To optimize fast population transfer and Bell state generation in dissipative quantum systems.

Main Methods:

  • The study builds upon solutions for closed systems and adapts them for open quantum systems.
  • A geometric procedure is employed, incorporating an additional magnetic field to counteract dissipation.
  • The method is applied to single spin systems and extended to two interacting spins.

Main Results:

  • An analytical expression for an extra magnetic field is derived to compensate for dissipation.
  • The method achieves exact geometric optimization for fast population transfer.
  • Robustness properties of noise-optimized protocols are preserved.
  • Fidelity close to unity is restored for fast Bell state generation in two-spin systems.

Conclusions:

  • The proposed geometric method effectively mitigates dissipation in open quantum systems.
  • This approach enables highly accurate and fast quantum state preparation and manipulation.
  • The technique offers a promising pathway for robust quantum information processing despite environmental noise.