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Solid State Spin-Wave Quantum Memory for Time-Bin Qubits.

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Researchers developed the first solid-state quantum memory storing single photons on demand. This breakthrough in atomic frequency comb quantum memory technology advances scalable quantum networks.

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Area of Science:

  • Quantum Information Science
  • Solid-State Physics
  • Optics

Background:

  • Quantum memories are crucial for quantum communication and computation.
  • Solid-state systems offer advantages for scalability and integration.
  • Previous quantum memories often lacked on-demand readout capabilities.

Purpose of the Study:

  • To demonstrate the first solid-state spin-wave optical quantum memory with on-demand read-out.
  • To store and retrieve photonic quantum information with high fidelity.
  • To advance the development of quantum memories for scalable quantum networks.

Main Methods:

  • Utilized the atomic frequency comb scheme in a Pr(3+):Y2SiO5 crystal.
  • Stored weak coherent pulses at the single-photon level.
  • Employed narrow-band spectral filtering via spectral hole burning to reduce noise.

Main Results:

  • Achieved on-demand read-out of stored single-photon level pulses with a signal-to-noise ratio >10.
  • Reduced unconditional noise level to (2.0±0.3)×10(-3) photons per pulse.
  • Demonstrated spin-wave storage of photonic time-bin qubits with high conditional fidelities, confirming quantum regime operation.

Conclusions:

  • This work presents the first quantum memory for time-bin qubits with on-demand read-out.
  • The developed solid-state spin-wave quantum memory is a significant step towards scalable quantum networks.
  • The results pave the way for practical applications of quantum memory in quantum information processing.