TY - JOUR

T1 - Entanglement distribution with wavevector-multiplexed quantum memory

AU - Lipka, Michal

AU - Mazelanik, Mateusz

AU - Parniak, Michal

PY - 2021/5/7

Y1 - 2021/5/7

N2 - Feasible distribution of quantum entanglement over long distances remains a fundamental step towards quantum secure communication and quantum network implementations. Quantum repeater nodes based on quantum memories promise to overcome exponential signal decay inherent to optical implementations of quantum communication. While performance of current quantum memories hinders their practical application, multimode solutions with multiplexing can offer tremendous increase in entanglement distribution rates. We propose to use a wavevector-multiplexed atomic quantum memory (WV-MUX-QM) as a fundamental block of a multiplexed quantum repeater architecture. We show the WV-MUX-QM platform to provide quasi-deterministic entanglement generation over extended distances, mitigating the fundamental issue of optical loss even with currently available quantum memory devices, and exceeding performance of repeaterless solutions as well as other repeater-based protocols such as temporal multiplexing. We establish the entangled-bit (ebit) rate per number of employed nodes as a practical figure of merit reflecting the cost-efficiency of larger inter-node distances.

AB - Feasible distribution of quantum entanglement over long distances remains a fundamental step towards quantum secure communication and quantum network implementations. Quantum repeater nodes based on quantum memories promise to overcome exponential signal decay inherent to optical implementations of quantum communication. While performance of current quantum memories hinders their practical application, multimode solutions with multiplexing can offer tremendous increase in entanglement distribution rates. We propose to use a wavevector-multiplexed atomic quantum memory (WV-MUX-QM) as a fundamental block of a multiplexed quantum repeater architecture. We show the WV-MUX-QM platform to provide quasi-deterministic entanglement generation over extended distances, mitigating the fundamental issue of optical loss even with currently available quantum memory devices, and exceeding performance of repeaterless solutions as well as other repeater-based protocols such as temporal multiplexing. We establish the entangled-bit (ebit) rate per number of employed nodes as a practical figure of merit reflecting the cost-efficiency of larger inter-node distances.

KW - quantum communication

KW - quantum memory

KW - multiplexing

KW - atomic ensemble

KW - quantum repeater

KW - multimode light

KW - EXPERIMENTAL REALIZATION

KW - ATOMIC ENSEMBLES

KW - KEY DISTRIBUTION

KW - STATE

KW - TIME

KW - REPEATERS

KW - PHOTONS

KW - COMPACT

KW - STORAGE

KW - FIBER

U2 - 10.1088/1367-2630/abf79a

DO - 10.1088/1367-2630/abf79a

M3 - Journal article

VL - 23

JO - New Journal of Physics

JF - New Journal of Physics

SN - 1367-2630

IS - 5

M1 - 053012

ER -