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Frequency Tunable, Cavity-Enhanced Single Erbium Quantum Emitter in the Telecom Band.

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Researchers achieved linear Stark tuning of single Erbium ions (Er3+) in lithium niobate, overcoming challenges for quantum networks. This breakthrough enables tunable quantum emitters for scalable quantum information processing.

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Area of Science:

  • Quantum Information Science
  • Solid-State Quantum Emitters
  • Nanophotonics

Background:

  • Solid-state quantum emitters are crucial for quantum information processors and networks.
  • Erbium ions (Er3+) offer desirable telecom-band transitions and long spin coherence times.
  • Challenges include long excited-state lifetimes and spectral inhomogeneity, hindering scalability.

Purpose of the Study:

  • To demonstrate linear Stark tuning of single Er3+ ion emission frequency.
  • To overcome limitations in photon emission rates and spectral distinguishability for quantum networking.
  • To enable tunable quantum emitters for large-scale, multinode quantum networks.

Main Methods:

  • Embedding Er3+ ions in lithium niobate crystals.
  • Coupling ions evanescently to a silicon nanophotonic crystal cavity.
  • Applying an electric field along the crystal c-axis to induce Stark tuning.

Main Results:

  • Achieved linear Stark tuning of single Er3+ ion emission frequency.
  • Tuning range exceeded the ion's linewidth.
  • Single-photon emission statistics remained unchanged during tuning.
  • Enhanced decay rate through cavity coupling.

Conclusions:

  • Demonstrated a viable method for tuning single Er3+ ion emission.
  • Linear Stark tuning overcomes spectral inhomogeneity challenges.
  • This is a critical advancement for developing rare-earth ion-based quantum networks.