One of the key components of many quantum technologies, as long-distance communications and quantum computing, are quantum light memories. Rare-earth doped crystals (RE) are one of the preferred materials of researchers for developing those memories because they show high-efficiency, long storage time and broad bandwidth when used for quantum storage of light.
Those materials, in the form on nanofilms or nanoparticles, have previously shown long optical and spin coherence lifetimes and can offer flexibility in design, composition and integration. Nevertheless, their capabilities concerning quantum coherence, that is maintaining quantum states for long lifetimes, have proven very difficult at this tiny scale. The higher concentration of defects and significant surface effects are often observed in these systems, hindering their use for quantum communication and computing.
Now a team of researchers, led by Professor Philippe Goldner from Chimie ParisTech, PSL University- CNRS and member of the Quantum Flagship’s project SQUARE, have been able to overcome this issue by testing such capabilities on rare-earth dope nanoparticles using the Stark echo modulation memory protocol (SEMM), an on-demand electro-optic quantum protocol. In their experiment, they selected Eu3+:Y2O3 nanoparticles of 100 nm diameter and were able to demonstrate, at 1.3 K and using weak electric fields, coherent storage of light, a memory time up to 40 µs, a frequency-multiplexed storage capability, and an extremely high fidelity between the input and output signals, an essential requirement for efficient quantum memories.
All of these findings, published a study in the journal NanoLetters, show that nanoscale memories made of rare-earth-doped nanoparticles are capable of storing light efficiently, with more bandwidth and improved processing capabilities, making them promising candidates for developing multimode and long-storage quantum memories.
Contact information
Philippe Goldner
Institut de Recherche de Chimie Paris, Université PSL
Chimie ParisTech, CNRS, 75005 Paris
philippe.goldner@chimie-paristech.fr
Tel. 01 53 73 79 30
More information
- Reference: A. Fossati, S. Liu, J. Karlsson, A. Ikesue, A. Tallaire, A. Ferrier, D. Serrano, and P. Goldner*, Nano Letters 2020 20 (10), 7087-7093. DOI: 10.1021/acs.nanolett.0c02200
This study has been conducted within the framework of the European FET-Open NanOQTech project and the Quantum Flagship SQUARE project.
-
February 15th, 2021
Quantum systems learn joint computing
Researchers realize the first quantum-logic computer operation between two separate quantum modules in different laboratories.
-
February 5th, 2021
How complex oscillations in a quantum system simplify with time
A team of researchers have shown that in a one-dimensional quantum system, the initially complex distribution of vibrations or phonons can change over time into a simple Gaussian bell curve.
-
February 1st, 2021
Advances in visualizing large quantum states
A study published in Physical Review A by Quantum Flagship projects PASQuanS and AQTION reports on a novel fast computational method that enables to visualize and thus to better understand large many-body quantum systems