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Gradient Echo Quantum Memory in Warm Atomic Vapor
10:00

Gradient Echo Quantum Memory in Warm Atomic Vapor

Published on: November 11, 2013

Memory for light as a quantum process.

M Lobino1, C Kupchak, E Figueroa

  • 1Institute for Quantum Information Science, University of Calgary, Calgary, Alberta T2N 1N4, Canada.

Physical Review Letters
|June 13, 2009
PubMed
Summary
This summary is machine-generated.

We fully characterized an optical memory using electromagnetically induced transparency. This allows predicting stored quantum states and verifying nonclassicality benchmarks for quantum information applications.

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Area of Science:

  • Quantum optics
  • Quantum information science
  • Atomic, molecular, and optical physics

Background:

  • Electromagnetically induced transparency (EIT) enables novel quantum phenomena.
  • Optical memories are crucial for quantum information processing and communication.
  • Characterizing quantum devices is essential for understanding their capabilities.

Purpose of the Study:

  • To fully characterize an optical memory based on EIT.
  • To recover and analyze the superoperator governing the memory's behavior.
  • To verify the nonclassicality of stored quantum states.

Main Methods:

  • Utilized quantum process tomography (QPT).
  • Stored and retrieved coherent states.
  • Analyzed the retrieved quantum states to determine the memory's superoperator.

Main Results:

  • Successfully recovered the superoperator for the optical memory under two conditions.
  • Demonstrated the ability to predict retrieved quantum states for various inputs (e.g., squeezed vacuum, Fock states).
  • Verified the nonclassicality benchmark for storing Gaussian distributed coherent states.

Conclusions:

  • The characterized EIT-based optical memory is a viable component for quantum information applications.
  • Quantum process tomography provides a robust method for evaluating quantum memory performance.
  • The study confirms the potential for high-fidelity quantum state storage and retrieval.