Related Experiment Video
Updated: Feb 6, 2026
10:00
Gradient Echo Quantum Memory in Warm Atomic Vapor
Published on: November 11, 2013
13.2K
Multiplexed storage and real-time manipulation based on a multiple degree-of-freedom quantum memory
Tian-Shu Yang1,2, Zong-Quan Zhou3,4, Yi-Lin Hua1,2
1CAS Key Laboratory of Quantum Information, University of Science and Technology of China, Hefei, 230026, China.
Nature Communications
|August 26, 2018
Summary
Researchers developed a novel quantum memory capable of storing and manipulating quantum states using multiple degrees of freedom. This breakthrough is crucial for building scalable quantum networks and advanced quantum repeaters.
Area of Science:
- Quantum Information Science
- Quantum Optics
- Materials Science
Background:
- Realizing large-scale quantum networks requires efficient quantum repeaters.
- Highly multimode quantum memories are essential for high-speed quantum communication.
Purpose of the Study:
- To demonstrate on-demand storage of quantum states in a rare-earth-ion-doped crystal.
- To develop a multi-degree-of-freedom quantum memory for enhanced capacity.
Main Methods:
- Utilized orbital angular momentum states with weak coherent pulses at the single-photon level.
- Combined spatial, temporal, and spectral degrees of freedom in a quantum memory device.
Main Results:
- Achieved on-demand storage of spatial quantum states with high fidelity.
- Demonstrated a quantum memory with high multimode capacity by integrating multiple degrees of freedom.
- Showcased the device's capability as a quantum mode converter.
Conclusions:
- The developed quantum memory serves as a key building block for scalable photonic quantum information processing.
- This technology advances the construction of multiplexed quantum repeaters for quantum networks.
- Enables real-time spectral and temporal manipulation of spatial-qutrit-encoded photonic pulses.
Related Concept Videos
01:24One-Degree-of-Freedom System
853
In mechanical engineering, one-degree-of-freedom systems form the basis of a wide range of electrical and mechanical components. Using these models, engineers can predict the behavior of various parts in a larger system, which gives them insight into how different forces interact with each other.
A one-degree-of-freedom system is defined by an independent variable that determines its state and behavior. One example of a one-degree-of-freedom system is a simple harmonic oscillator, such as a...
A one-degree-of-freedom system is defined by an independent variable that determines its state and behavior. One example of a one-degree-of-freedom system is a simple harmonic oscillator, such as a...
853
01:02Degrees of Freedom
7.2K
The degree of freedom for a particular statistical calculation is the number of values that are free to vary. Thus, the minimum number of independent numbers can specify a particular statistic. The degrees of freedom differ greatly depending on known and uncalculated statistical components.
For example, suppose there are three unknown numbers whose mean is 10; although we can freely assign values to the first and second numbers, the value of the last number can not be arbitrarily assigned.
For example, suppose there are three unknown numbers whose mean is 10; although we can freely assign values to the first and second numbers, the value of the last number can not be arbitrarily assigned.
7.2K
01:02Degrees of Freedom
10.3K
The degree of freedom for a particular statistical calculation is the number of values that are free to vary. As a result, the minimum number of independent numbers can specify a particular statistic. The degrees of freedom differ greatly depending on known and uncalculated statistical components.
For example, suppose there are three unknown numbers whose mean is 10; although we can freely assign values to the first and second numbers, the value of the last number can not be arbitrarily...
For example, suppose there are three unknown numbers whose mean is 10; although we can freely assign values to the first and second numbers, the value of the last number can not be arbitrarily...
10.3K
02:43Quantum Numbers
50.8K
It is said that the energy of an electron in an atom is quantized; that is, it can be equal only to certain specific values and can jump from one energy level to another but not transition smoothly or stay between these levels.
50.8K
02:45The Quantum-Mechanical Model of an Atom
58.1K
Shortly after de Broglie published his ideas that the electron in a hydrogen atom could be better thought of as being a circular standing wave instead of a particle moving in quantized circular orbits, Erwin Schrödinger extended de Broglie’s work by deriving what is now known as the Schrödinger equation. When Schrödinger applied his equation to hydrogen-like atoms, he was able to reproduce Bohr’s expression for the energy and, thus, the Rydberg formula governing hydrogen spectra.
58.1K
02:57Real Time RT-PCR
65.3K
Real-time reverse transcription-polymerase chain reaction, or Real-time RT-PCR, is an analytical tool used to determine the expression level of target genes. The method involves converting mRNA to complementary DNA with the help of an enzyme known as reverse transcriptase, followed by the PCR amplification of the cDNA. These two processes can be performed simultaneously in a single tube or separately as a two-step reaction.
The real-time quantification of the number of amplified products is...
The real-time quantification of the number of amplified products is...
65.3K