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Gradient Echo Quantum Memory in Warm Atomic Vapor
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On-Demand Integrated Quantum Memory for Polarization Qubits.

Tian-Xiang Zhu1,2,3, Chao Liu1,2,3, Ming Jin1,2,3

  • 1CAS Key Laboratory of Quantum Information, University of Science and Technology of China, Hefei 230026, China.

Physical Review Letters
|May 20, 2022
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Summary
This summary is machine-generated.

Researchers developed a new quantum memory for polarization qubits using a rare-earth-doped crystal. This breakthrough enables reliable on-demand storage, crucial for building scalable quantum networks.

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Area of Science:

  • Quantum Information Science
  • Integrated Photonics
  • Quantum Communication

Background:

  • Photonic polarization qubits are essential for quantum computation and communication.
  • Integrated quantum memories are key components for quantum networks.
  • On-demand storage of polarization qubits faces challenges like anisotropic absorption.

Purpose of the Study:

  • To demonstrate a reliable on-demand quantum memory for polarization qubits.
  • To overcome limitations in storing polarization qubits in integrated systems.

Main Methods:

  • Fabrication of a depressed-cladding waveguide in a ^{151}Eu^{3+}:Y_{2}SiO_{5} crystal.
  • Utilizing site-2 ^{151}Eu^{3+} ions for near-uniform absorption.
  • Development of a novel pump sequence for enhanced absorption profiles.

Main Results:

  • Achieved a high fidelity of 99.4±0.6% for qubit storage.
  • Demonstrated a storage bandwidth of 10 MHz.
  • Successfully stored polarization qubits on-demand with low photon input (0.32 photons/pulse).

Conclusions:

  • The developed integrated quantum memory is reliable for polarization qubits.
  • This technology shows significant potential for constructing large-scale integrated quantum networks.