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Quasi-light Storage for Optical Data Packets
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Nanophotonic rare-earth quantum memory with optically controlled retrieval.

Tian Zhong1, Jonathan M Kindem1, John G Bartholomew1

  • 1T. J. Watson Laboratory of Applied Physics, California Institute of Technology, 1200 East California Boulevard, Pasadena, CA 91125, USA.

Science (New York, N.Y.)
|September 2, 2017
PubMed
Summary

Researchers developed a high-fidelity nanophotonic quantum memory using neodymium and a photonic crystal cavity. This solid-state device enables efficient qubit storage and controlled readout, crucial for advancing quantum networks.

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Area of Science:

  • Quantum Information Science
  • Nanophotonics
  • Solid-State Physics

Background:

  • Quantum networks require reliable quantum memory for entanglement distribution.
  • On-chip qubit storage with controlled readout is key for scalable quantum network nodes.
  • Neodymium ensembles coupled to cavities offer potential for high-performance quantum memories.

Purpose of the Study:

  • To demonstrate a high-fidelity nanophotonic quantum memory.
  • To achieve efficient initialization and time-selective readout of qubits.
  • To develop an integrable solid-state memory for quantum network nodes.

Main Methods:

  • Coupling a mesoscopic neodymium ensemble to a photonic crystal nanocavity.
  • Utilizing the nanocavity for >95% spin polarization and efficient initialization.
  • Employing an enhanced optical Stark shift for time bin-selective readout of atomic frequency comb states.

Main Results:

  • Demonstrated a high-fidelity nanophotonic quantum memory.
  • Achieved efficient spin polarization (>95%) for memory initialization.
  • Enabled time bin-selective readout via optical Stark shift control.

Conclusions:

  • The developed solid-state quantum memory is highly efficient and controllable.
  • This memory is integrable with other chip-scale devices for quantum information processing.
  • The technology advances the development of scalable quantum network nodes.