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Generation and Coherent Control of Pulsed Quantum Frequency Combs
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Deterministic controlled enhancement of local quantum coherence.

Nikola Horová1, Robert Stárek2, Michal Mičuda1

  • 1Department of Optics, Faculty of Science, Palacký University, 17. listopadu 1192/12, 779 00, Olomouc, Czech Republic.

Scientific Reports
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Summary

We developed a method to boost quantum coherence in a target system using a control system. This technique deterministically enhances target coherence while preserving purity, with potential for further improvements through iteration.

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Area of Science:

  • Quantum Information Science
  • Quantum Optics
  • Quantum Control

Background:

  • Quantum coherence is a fundamental resource for quantum information processing.
  • Maintaining and enhancing coherence is crucial for developing robust quantum technologies.
  • Bipartite systems offer unique possibilities for manipulating quantum states.

Purpose of the Study:

  • To investigate assisted enhancement of quantum coherence in a bipartite system.
  • To convert coherence from a control qubit to a target qubit.
  • To achieve deterministic enhancement of target system coherence while preserving purity.

Main Methods:

  • Utilizing a control and target qubit system with local incoherent operations and classical communication.
  • Employing a fixed Hamiltonian coupling between subsystems with controllable interaction strength.
  • Implementing a measurement and feed-forward based protocol for coherence transfer.

Main Results:

  • Demonstrated a protocol that deterministically enhances the coherence of the target system.
  • Showed that the target system's purity is fully preserved during the process.
  • Successfully iterated the protocol up to five times, driving the target system closer to maximal coherence.
  • Experimentally validated the protocol using a photonic setup.

Conclusions:

  • The developed protocol provides an effective method for enhancing quantum coherence in bipartite systems.
  • Iterative application allows for arbitrary approach to maximally coherent states.
  • Experimental demonstration confirms the feasibility and effectiveness of the proposed technique.