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Gradient Echo Quantum Memory in Warm Atomic Vapor
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A controlled ac Stark echo for quantum memories.

Byoung S Ham1

  • 1Center for Photon Information Processing, and School of Electrical Engineering and Computer Science, Gwangju Institute of Science and Technology, 123 Chumdangwagi-ro, Buk-gu, Gwangju, 61005, South Korea. bham@gist.ac.kr.

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This summary is machine-generated.

This study introduces a new all-optical quantum memory protocol using controlled ac Stark echoes (CASE). It overcomes previous limitations, enabling dynamic control for advanced quantum information processing.

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Area of Science:

  • Quantum Information Science
  • Quantum Optics
  • Atomic, Molecular, and Optical Physics

Background:

  • Quantum memories are crucial for quantum communication and computation.
  • Existing photon echo schemes for quantum memory face challenges like absorptive echoes.
  • Controlled ac Stark echoes (CASE) offer a potential solution for robust quantum memory.

Purpose of the Study:

  • To propose and demonstrate a novel quantum memory protocol based on controlled ac Stark echoes (CASE).
  • To address and overcome the fundamental problem of absorptive echoes in double rephasing photon echo schemes.
  • To achieve dynamic, wavelength-selective control for quantum information processing tasks.

Main Methods:

  • Implementation of a double rephasing photon echo scheme with controlled Rabi flopping.
  • Utilizing unbalanced ac Stark shifts to dynamically control the first echo.
  • Employing controlled coherence conversion to make the second echo emissive.
  • Adopting a backward echo scheme for achieving an ultralong CASE.

Main Results:

  • Demonstrated dynamic control of the first echo, preventing interference with the second echo.
  • Achieved a coherent, emissive second echo through controlled coherence conversion.
  • Presented a near-perfect ultralong CASE using a backward echo scheme.
  • The proposed protocol is all-optical, unlike methods relying on dc Stark shifts.

Conclusions:

  • The proposed CASE protocol effectively overcomes limitations of previous quantum memory schemes.
  • This all-optical approach offers significant advantages for wavelength-selective dynamic control in quantum processing.
  • The protocol enables key quantum memory functions including erasing, buffering, and channel multiplexing.