Related Experiment Video
Updated: Mar 24, 2026
10:00
Gradient Echo Quantum Memory in Warm Atomic Vapor
Published on: November 11, 2013
13.3K
Cavity-Enhanced Room-Temperature Broadband Raman Memory.
D J Saunders1, J H D Munns1,2, T F M Champion1
1Clarendon Laboratory, University of Oxford, Parks Road, Oxford OX1 3PU, United Kingdom.
Physical Review Letters
|March 19, 2016
Summary
Researchers developed a new quantum memory using alkali vapor and a birefringent cavity. This breakthrough reduces energy needs and noise, achieving high efficiency for quantum information processing.
Area of Science:
- Quantum Information Science
- Atomic, Molecular, and Optical Physics
Background:
- Broadband quantum memories are crucial for photonic quantum information protocols.
- Alkali-vapor Raman memories offer high-bandwidth storage, on-demand readout, and room-temperature operation.
- Previous Raman memory implementations faced challenges with high control pulse energies and four-wave-mixing noise.
Purpose of the Study:
- To enhance Raman memory performance by reducing control pulse energy and suppressing noise.
- To improve the efficiency and fidelity of quantum memory for photonic applications.
Main Methods:
- Utilized a low-finesse birefringent cavity to enhance the Raman memory interaction.
- Achieved simultaneous resonance for signal and control fields within the cavity.
- Engineered antiresonance for the anti-Stokes field to suppress four-wave-mixing noise.
Main Results:
- Demonstrated a significant reduction in required control pulse energy.
- Achieved the lowest unconditional noise floor yet reported for a Raman-type warm vapor memory: (15±2)×10^{-3} photons per pulse.
- Reported a total memory efficiency of (9.5±0.5)%.
Conclusions:
- The developed cavity-enhanced Raman memory overcomes previous limitations in energy requirements and noise.
- This improved quantum memory is a promising candidate for multiplexing elements in future quantum networks.
- The low noise floor and high efficiency represent a significant advancement in warm vapor quantum memory technology.
Related Concept Videos
01:26Raman Spectroscopy Instrumentation: Overview
1.7K
A conventional Raman spectrophotometer includes a laser source, a sample holding system, a wavelength selector, and a detector.
The monochromatic laser source, typically using visible or near-infrared radiation, generates a highly focused beam of light. This light interacts with the molecules of the sample, scattering some of the light. Liquid and gaseous samples are usually tested in ordinary glass capillaries, while solids can be analyzed as powders packed in capillaries or as potassium...
The monochromatic laser source, typically using visible or near-infrared radiation, generates a highly focused beam of light. This light interacts with the molecules of the sample, scattering some of the light. Liquid and gaseous samples are usually tested in ordinary glass capillaries, while solids can be analyzed as powders packed in capillaries or as potassium...
1.7K
01:20Raman Spectroscopy: Overview
2.3K
The underlying principle of Raman spectroscopy is based on the interaction between light and matter, specifically molecules' inelastic scattering of photons. When a monochromatic beam of light, typically from a laser source, interacts with a sample, most scattered light has the same frequency as the incident light. This is known as Rayleigh scattering.
However, a small fraction of the scattered light exhibits a frequency shift due to the exchange of energy between the incident photons and...
However, a small fraction of the scattered light exhibits a frequency shift due to the exchange of energy between the incident photons and...
2.3K