scholarly journals Coupling of a quantum memory and telecommunication wavelength photons for high-rate entanglement distribution in quantum repeaters

2021 ◽  
Author(s):  
Kyoko Mannami ◽  
Takeshi Kondo ◽  
Tomoki Tsuno ◽  
Takuto Miyashita ◽  
Daisuke Yoshida ◽  
...  
Keyword(s):  
Quantum Memory ◽  
High Rate ◽  
Telecommunication Wavelength ◽  
Entanglement Distribution ◽  
Quantum Repeaters

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 Quantum repeaters with individual rare-earth ions at telecommunication wavelengths

Quantum ◽  
2018 ◽  
Vol 2 ◽  
pp. 93 ◽  
Author(s):  
F. Kimiaee Asadi ◽  
N. Lauk ◽  
S. Wein ◽  
N. Sinclair ◽  
C. O'Brien ◽  
...  
Keyword(s):  
Photon Emission ◽  
Entanglement Swapping ◽  
Rare Earth Ions ◽  
Atomic Ensemble ◽  
Purcell Factor ◽  
Quantum Repeater ◽  
Erbium Ions ◽  
Long Term Storage ◽  
Telecommunication Wavelength ◽  
Entanglement Distribution

We present a quantum repeater scheme that is based on individual erbium and europium ions. Erbium ions are attractive because they emit photons at telecommunication wavelength, while europium ions offer exceptional spin coherence for long-term storage. Entanglement between distant erbium ions is created by photon detection. The photon emission rate of each erbium ion is enhanced by a microcavity with high Purcell factor, as has recently been demonstrated. Entanglement is then transferred to nearby europium ions for storage. Gate operations between nearby ions are performed using dynamically controlled electric-dipole coupling. These gate operations allow entanglement swapping to be employed in order to extend the distance over which entanglement is distributed. The deterministic character of the gate operations allows improved entanglement distribution rates in comparison to atomic ensemble-based protocols. We also propose an approach that utilizes multiplexing in order to enhance the entanglement distribution rate.

scholarly journals Long-Lived Solid-State Optical Memory for High-Rate Quantum Repeaters

2021 ◽  
Vol 127 (22) ◽  
Author(s):  
Mohsen Falamarzi Askarani ◽  
Antariksha Das ◽  
Jacob H. Davidson ◽  
Gustavo C. Amaral ◽  
Neil Sinclair ◽  
...  
Keyword(s):  
Solid State ◽  
Optical Memory ◽  
High Rate ◽  
Quantum Repeaters

scholarly journals Towards highly multimode optical quantum memory for quantum repeaters

2016 ◽  
Vol 93 (3) ◽  
Author(s):  
Pierre Jobez ◽  
Nuala Timoney ◽  
Cyril Laplane ◽  
Jean Etesse ◽  
Alban Ferrier ◽  
...  
Keyword(s):  
Quantum Memory ◽  
Quantum Repeaters

scholarly journals Massively-multiplexed generation of Bell-type entanglement using a quantum memory

2021 ◽  
Vol 4 (1) ◽  
Author(s):  
Michał Lipka ◽  
Mateusz Mazelanik ◽  
Adam Leszczyński ◽  
Wojciech Wasilewski ◽  
Michał Parniak
Keyword(s):  
Secure Communication ◽  
Degrees Of Freedom ◽  
Quantum Memory ◽  
High Rate ◽  
Network Architectures ◽  
Fundamental Building Block ◽  
Quantum Secure Communication ◽  
Complementary Approach ◽  
Photonic States ◽  
Technological Constraints

AbstractHigh-rate generation of hybrid photon-matter entanglement remains a fundamental building block of quantum network architectures enabling protocols such as quantum secure communication or quantum distributed computing. While a tremendous effort has been made to overcome technological constraints limiting the efficiency and coherence times of current systems, an important complementary approach is to employ parallel and multiplexed architectures. Here we follow this approach experimentally demonstrating the generation of bipartite polarization-entangled photonic states across more than 500 modes, with a programmable delay for the second photon enabled by qubit storage in a wavevector-multiplexed cold-atomic quantum memory. We demonstrate Clauser, Horne, Shimony, Holt inequality violation by over 3 standard deviations, lasting for at least 45 μs storage time for half of the modes. The ability to shape hybrid entanglement between the polarization and wavevector degrees of freedom provides not only multiplexing capabilities but also brings prospects for novel protocols.

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.

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