scholarly journals Multicell Atomic Quantum Memory as a Hardware-Efficient Quantum Repeater Node

PRX Quantum ◽  
2021 ◽  
Vol 2 (4) ◽  
Author(s):  
C. Li ◽  
S. Zhang ◽  
Y.-K. Wu ◽  
N. Jiang ◽  
Y.-F. Pu ◽  
...  
Keyword(s):  
Quantum Memory ◽  
Quantum Repeater

scholarly journals Experimental quantum repeater without quantum memory

2019 ◽  
Vol 13 (9) ◽  
pp. 644-648 ◽  
Author(s):  
Zheng-Da Li ◽  
Rui Zhang ◽  
Xu-Fei Yin ◽  
Li-Zheng Liu ◽  
Yi Hu ◽  
...  
Keyword(s):  
Quantum Memory ◽  
Quantum Repeater

scholarly journals Optical Quantum Memory and its Applications in Quantum Communication Systems

2020 ◽  
Vol 125 ◽  
Author(s):  
Lijun Ma ◽  
Oliver Slattery ◽  
Xiao Tang
Keyword(s):  
Communication Systems ◽  
Quantum Systems ◽  
Quantum Memory ◽  
Research Progress ◽  
Quantum Communications ◽  
Quantum Repeater ◽  
Quantum Networks ◽  
And Performance ◽  
The Impact ◽  
Photon Source

Optical quantum memory is a device that can store the quantum state of photons and retrieve it on demand and with high fidelity. It is emerging as an essential device to enhance security, speed, scalability, and performance of many quantum systems used in communications, computing, metrology, and more. In this paper, we will specifically consider the impact of optical quantum memory on quantum communications systems. Following a general overview of the theoretical and experimental research progress in optical quantum memory, we will outline its role in quantum communications, including as a photon source, photon interference, quantum key distribution (QKD), quantum teleportation, quantum repeater, and quantum networks.

scholarly journals Optical Quantum Memory and its Applications in Quantum Communication Systems

2019 ◽  
Vol 124 ◽  
Author(s):  
Lijun Ma ◽  
Oliver Slattery ◽  
Xiao Tang
Keyword(s):  
Communication Systems ◽  
Quantum Systems ◽  
Quantum Memory ◽  
Research Progress ◽  
Quantum Communications ◽  
Quantum Repeater ◽  
Quantum Networks ◽  
And Performance ◽  
The Impact ◽  
Photon Source

Optical quantum memory is a device that can store the quantum state of photons and retrieve it on demand and with high fidelity. It is emerging as an essential device to enhance security, speed, scalability, and performance of many quantum systems used in communications, computing, metrology, and more. In this paper, we will specifically consider the impact of optical quantum memory on quantum communications systems. Following a general overview of the theoretical and experimental research progress in optical quantum memory, we will outline its role in quantum communications, including as a photon source, photon interference, quantum key distribution (QKD), quantum teleportation, quantum repeater, and quantum networks.

scholarly journals One-hour coherent optical storage in an atomic frequency comb memory

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Yu Ma ◽  
You-Zhi Ma ◽  
Zong-Quan Zhou ◽  
Chuan-Feng Li ◽  
Guang-Can Guo
Keyword(s):  
Optical Fibers ◽  
Large Scale ◽  
Quantum Communication ◽  
Frequency Comb ◽  
Quantum Memory ◽  
Spin Coherence ◽  
Quantum Repeater ◽  
Long Distance ◽  
Alternative Solutions ◽  
Atomic Frequency

AbstractPhoton loss in optical fibers prevents long-distance distribution of quantum information on the ground. Quantum repeater is proposed to overcome this problem, but the communication distance is still limited so far because of the system complexity of the quantum repeater scheme. Alternative solutions include transportable quantum memory and quantum-memory-equipped satellites, where long-lived optical quantum memories are the key components to realize global quantum communication. However, the longest storage time of the optical memories demonstrated so far is approximately 1 minute. Here, by employing a zero-first-order-Zeeman magnetic field and dynamical decoupling to protect the spin coherence in a solid, we demonstrate coherent storage of light in an atomic frequency comb memory over 1 hour, leading to a promising future for large-scale quantum communication based on long-lived solid-state quantum memories.

scholarly journals Theory of Noise-Scaled Stability Bounds and Entanglement Rate Maximization in the Quantum Internet

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Laszlo Gyongyosi ◽  
Sandor Imre
Keyword(s):  
Strong Stability ◽  
Entanglement Swapping ◽  
Quantum Memory ◽  
Density Matrices ◽  
Quantum Repeater ◽  
Stability Properties ◽  
Rate Maximization ◽  
Quantum Repeaters ◽  
The Stability ◽  
Quantum Internet

AbstractCrucial problems of the quantum Internet are the derivation of stability properties of quantum repeaters and theory of entanglement rate maximization in an entangled network structure. The stability property of a quantum repeater entails that all incoming density matrices can be swapped with a target density matrix. The strong stability of a quantum repeater implies stable entanglement swapping with the boundness of stored density matrices in the quantum memory and the boundness of delays. Here, a theoretical framework of noise-scaled stability analysis and entanglement rate maximization is conceived for the quantum Internet. We define the term of entanglement swapping set that models the status of quantum memory of a quantum repeater with the stored density matrices. We determine the optimal entanglement swapping method that maximizes the entanglement rate of the quantum repeaters at the different entanglement swapping sets as function of the noise of the local memory and local operations. We prove the stability properties for non-complete entanglement swapping sets, complete entanglement swapping sets and perfect entanglement swapping sets. We prove the entanglement rates for the different entanglement swapping sets and noise levels. The results can be applied to the experimental quantum Internet.

scholarly journals Entanglement distribution between quantum repeater nodes with an absorptive type memory

2020 ◽  
Vol 18 (05) ◽  
pp. 2050026
Author(s):  
Daisuke Yoshida ◽  
Kazuya Niizeki ◽  
Shuhei Tamura ◽  
Tomoyuki Horikiri
Keyword(s):  
State Of The Art ◽  
Frequency Comb ◽  
Quantum Memory ◽  
Nitrogen Vacancy ◽  
High Rate ◽  
Quantum Repeater ◽  
Long Distance ◽  
Nitrogen Vacancy Centers ◽  
Entanglement Distribution ◽  
Multimode Operation

Quantum repeaters, which are indispensable for long-distance quantum communication, are necessary for extending the entanglement from short distance to long distance; however, high-rate entanglement distribution, even between adjacent repeater nodes, has not been realized. In a recent work by [C. Jones et al., New J. Phys. 18 (2016) 083015], the entanglement distribution rate between adjacent repeater nodes was calculated for a plurality of quantum dots, nitrogen-vacancy centers in diamond, and trapped ions adopted as quantum memories inside the repeater nodes. Considering practical use, arranging a plurality of quantum memories becomes so difficult with the state-of-the art technology. It is desirable that high-rate entanglement distribution is realized with as few memory crystals as possible. Here, we propose new entanglement distribution scheme with one quantum memory based on the atomic frequency comb which enables temporal multimode operation with one crystal. The adopted absorptive-type quantum memory degrades the difficulty of multimode operation compared with the previously investigated quantum memories directly generating spin-photon entanglement. It is shown that this scheme improves the distribution rate by nearly two orders of magnitude compared with the result in [C. Jones et al., New J. Phys. 18 (2016) 083015] and the experimental implementation is close by utilizing state-of-the-art technology.

scholarly journals Карты широкополосной квантовой памяти на частотной гребенке атомных линий-=SUP=-*-=/SUP=-

2019 ◽  
Vol 126 (1) ◽  
pp. 37
Author(s):  
Н.М. Арсланов ◽  
С.А. Моисеев
Keyword(s):  
Rare Earth ◽  
Quantum Efficiency ◽  
Atomic System ◽  
Frequency Comb ◽  
Optical Transition ◽  
Quantum Memory ◽  
Quantum Repeater ◽  
Dispersion Effects ◽  
Rare Earth Doped ◽  
Atomic Frequency

AbstractThe influence of the parameters of an inhomogeneously broadened optical transition in the shape of an atomic frequency comb on dispersion effects in the quantum-memory protocol implemented in such an atomic system is investigated. The results allowed maps to be constructed of dispersion and quantum efficiency for implementation of the studied protocol in rare-earth-doped crystals that are promising for creation of a quantum repeater.

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