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Two-dimensionally multiplexed on-demand quantum memories

Objective

A long-distance quantum network requires quantum repeaters dispersed between the end nodes. At intercity distances, the entangling rate of quantum repeaters may be limited by the photon travel time and the classical communication time. Quantum repeaters and memories based on rare-earth-doped crystals overcome this limitation, as the atomic frequency comb (AFC) protocol preparing these memories allows for temporal multiplexing. Besides temporal multiplexing, spatial and frequency multiplexing are also possibilities for rare-earth-doped crystals.
Entanglement between these quantum memories is generated in a hybrid and heralded scheme by entangling each memory with a telecom photon and detecting a single photon after a beam splitter. Thus, the key element for quantum repeaters with rare-earth-doped crystals is the quantum correlations between the telecom photons and the memories.
In this project, I will extend the storage capabilities and the entanglement generation rate of rare-earth-doped crystals such that realistic quantum repeater applications at intercity distances are within reach. The research project is divided into three research objectives: First, I will establish quantum correlations between a long-lived on-demand quantum memory and telecom photons. The correlations will be stored in spin waves for over milliseconds. Second, I will implement spatial multiplexing and store quantum correlations between telecom photons and 100 spatial modes of a single crystal. The spatial multiplexing is realized with acousto-optical devices in a crossed configuration. Third, I will entangle two on-demand quantum memories in 1700 modes with temporal and spatial multiplexing.
I expect that spatial multiplexing will become a standard tool for solid-state crystal memories. Entanglement of two on-demand memories in 1700 modes will mark a shift in paradigm, as this is the first demonstration of entanglement of two solid-state memories with multiplexing in two degrees of freedom.

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Programme(s)

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Topic(s)

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Funding Scheme

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HORIZON-TMA-MSCA-PF-EF - HORIZON TMA MSCA Postdoctoral Fellowships - European Fellowships

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Call for proposal

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(opens in new window) HORIZON-MSCA-2022-PF-01

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Coordinator

FUNDACIO INSTITUT DE CIENCIES FOTONIQUES
Net EU contribution

Net EU financial contribution. The sum of money that the participant receives, deducted by the EU contribution to its linked third party. It considers the distribution of the EU financial contribution between direct beneficiaries of the project and other types of participants, like third-party participants.

€ 181 152,96
Address
AVINGUDA CARL FRIEDRICH GAUSS 3
08860 Castelldefels
Spain

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Region
Este Cataluña Barcelona
Activity type
Research Organisations
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Total cost

The total costs incurred by this organisation to participate in the project, including direct and indirect costs. This amount is a subset of the overall project budget.

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