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Related Experiment Videos

Quantum memory for squeezed light.

Jürgen Appel1, Eden Figueroa, Dmitry Korystov

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

Physical Review Letters
|March 21, 2008
PubMed
Summary
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Researchers stored squeezed vacuum light pulses in a rubidium vapor cell, achieving 0.21 dB of squeezing after 1 microsecond. This study explores factors affecting squeezed light storage and atomic coherence.

Area of Science:

  • Quantum optics
  • Atomic physics

Background:

  • Squeezed vacuum states are crucial for precision measurements.
  • Storing quantum states in atomic ensembles offers potential for quantum memory applications.

Purpose of the Study:

  • To demonstrate the storage and retrieval of squeezed vacuum pulses in a rubidium vapor.
  • To quantify the squeezing fidelity after storage.
  • To investigate the decoherence mechanisms affecting the stored quantum state.

Main Methods:

  • Generation of 600-ns squeezed vacuum pulses at 795 nm using an optical parametric amplifier.
  • Storage of the squeezed light in a rubidium vapor cell utilizing electromagnetically induced transparency (EIT).
  • Analysis of the retrieved pulse using time-domain homodyne tomography.

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Main Results:

  • A 600-ns pulse of 1.86-dB squeezed vacuum was produced.
  • The pulse was successfully stored for 1 microsecond in the rubidium vapor.
  • The recovered pulse exhibited up to 0.21+/-0.04 dB of squeezing.
  • Factors contributing to squeezing degradation were identified.

Conclusions:

  • Electromagnetically induced transparency enables the storage of squeezed vacuum states in atomic ensembles.
  • Squeezing degradation occurs during storage, influenced by factors identified in the study.
  • Understanding these factors is essential for developing robust quantum memories.