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Connor Kupchak1, Thomas Mittiga1, Bertus Jordaan1

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|January 8, 2015
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Summary

Researchers developed a room-temperature optical quantum memory using atomic vapor. This device stores polarization qubits with high fidelity, surpassing classical limits for weak laser pulses.

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Area of Science:

  • Quantum Information Science
  • Atomic Physics
  • Optical Engineering

Background:

  • Optical quantum memories are crucial for quantum information processing.
  • Previous high-fidelity memories required cold atoms or cryogenic crystals.
  • Achieving low background noise at room temperature for photonic qubits is challenging.

Purpose of the Study:

  • To demonstrate a room-temperature optical quantum memory for arbitrary polarization qubits.
  • To achieve high fidelity and signal-to-background ratio for stored photonic qubits.
  • To explore the potential of atomic vapor systems for quantum information processing.

Main Methods:

  • Utilized a common vapor cell as the quantum memory medium.
  • Employed weak laser pulses with an average of 1.6 photons.
  • Measured signal-to-background ratio and average fidelity of stored polarization qubits.

Main Results:

  • Achieved a signal-to-background ratio greater than 1.
  • Demonstrated average fidelity surpassing the classical benchmark.
  • Showcased the capability of storing arbitrary polarization qubits at room temperature.

Conclusions:

  • A common vapor cell can achieve the low noise levels required for room-temperature polarization qubit storage.
  • Atomic vapor systems can attain functionality comparable to other quantum information processing architectures.
  • This work advances the development of practical quantum memories.