Team Demonstrates Multiple DOF, Solid-State Quantum Memory

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HEFEI, China, Aug. 28, 2018 — A team from the University of Science and Technology of China has developed multi-degree-of-freedom (DOF) multiplexed solid-state quantum memory and has demonstrated photon pulse operation functions with time and frequency DOFs.

The researchers demonstrated the on-demand storage of orbital-angular-momentum states with weak coherent pulses at the single-photon level in a rare-earth-ion-doped crystal. Through the combination of this 3D spatial DOF with 2D temporal and 2D spectral DOFs, the team created a multiple-DOF memory with high multimode capacity.

According to the researchers, this device could serve as a quantum mode converter with high fidelity — a fundamental requirement for the construction of a multiplexed quantum repeater.

The team further demonstrated that the device could perform arbitrary pulse operations within time and frequency DOF. Representative operations included pulses sequencer, multiplexer, selective spectral shifter, and configurable beamsplitter. The experimental results showed that in all of these operations, the 3D quantum states carried by photons maintained a fidelity of about 89 percent.

The researchers believe that the developed quantum memory could serve as a building block for scalable photonic quantum information processing architectures. The memory device can realize all the operations required for Knill-Laflamme-Milburn-type quantum computation. It could also find application in the field of linear optical quantum computing. 

Multi-degree-of-freedom (DOF) multiplexing quantum storage experimental device. Courtesy of Tianshu Yang, University of Science and Technology of China.

A multi-degree-of-freedom (DOF) multiplexing quantum storage experimental device. Courtesy of Tianshu Yang.

The research was published in Nature Communications (doi: 10.1038/s41467-018-05669-5).

Published: August 2018
linear optics
Linear optics refers to the study and manipulation of light in a linear and deterministic manner, where the response of optical elements is proportional to the amplitude of the incident light wave. In the context of linear optics, the superposition principle holds, meaning that the total response of a system to a sum of different input light waves is simply the sum of the responses to each individual wave. Key characteristics of linear optics include: Superposition: Linear optics adheres to...
quantum optics
The area of optics in which quantum theory is used to describe light in discrete units or "quanta" of energy known as photons. First observed by Albert Einstein's photoelectric effect, this particle description of light is the foundation for describing the transfer of energy (i.e. absorption and emission) in light matter interaction.
The term quantum refers to the fundamental unit or discrete amount of a physical quantity involved in interactions at the atomic and subatomic scales. It originates from quantum theory, a branch of physics that emerged in the early 20th century to explain phenomena observed on very small scales, where classical physics fails to provide accurate explanations. In the context of quantum theory, several key concepts are associated with the term quantum: Quantum mechanics: This is the branch of...
Research & TechnologyeducationAsia-PacificOpticslinear opticssingle photon statesolid-statequantum memoryquantum opticsquantumUniversity of Science and Technology of China

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