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Generation and Coherent Control of Pulsed Quantum Frequency Combs
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Periodic Cavity State Revivals from Atomic Frequency Combs.

Matthias Zens1, Dmitry O Krimer1, Himadri S Dhar2

  • 1Institute for Theoretical Physics, Vienna University of Technology (TU Wien), Wiedner Hauptstraße 8-10/136, A-1040 Vienna, Austria.

Physical Review Letters
|November 12, 2021
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Summary
This summary is machine-generated.

Spin ensembles with comb-shaped spectra act as efficient quantum memories. This study shows they perfectly absorb and reemit multiphoton states, achieving near-unity fidelity for quantum information storage.

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Area of Science:

  • Quantum Information Science
  • Cavity Quantum Electrodynamics (Cavity QED)
  • Condensed Matter Physics

Background:

  • Spin ensembles with comb-shaped spectra are promising for quantum memory applications.
  • Strong coupling regimes in cavity QED present unique challenges and opportunities for quantum control.

Purpose of the Study:

  • To theoretically investigate the behavior of atomic frequency combs in the strong coupling limit of cavity QED.
  • To demonstrate the feasibility of using these systems for high-fidelity quantum memory operations.

Main Methods:

  • Full quantum treatment utilizing advanced tensor-network methods.
  • Analysis of spin-photon interactions within a cavity.

Main Results:

  • Demonstration of near-perfect absorption of arbitrary multiphoton states by the spin ensemble.
  • Observation of reemission as parity-flipped states at periodic intervals.
  • Achievement of fidelity values near unity through compensation of spin-cavity coupling induced energy shifts.

Conclusions:

  • Atomic frequency combs in the strong coupling regime offer a robust platform for quantum memory.
  • Precise control over individual coupling strengths is key to achieving high-fidelity quantum state storage and retrieval.