Abstract
A quantum repeater is a system for long-distance quantum communication that employs quantum memory elements to mitigate optical fiber transmission losses. The multiplexed quantum memory (O. A. Collins, S. D. Jenkins, A. Kuzmich, and T. A. B. Kennedy, Phys. Rev. Lett. 98, 060502 (2007)) has been shown theoretically to reduce quantum memory time requirements. We present an initial implementation of a multiplexed quantum memory element in a cold rubidium gas. We show that it is possible to create atomic excitations in arbitrary memory element pairs and demonstrate the violation of Bell's inequality for light fields generated during the write and read processes.
Highlights
The protocols proposed to distribute entanglement over large distances require quantum memory storage lifetimes that are large compared to the classical communication time between nodes
Demonstration of long-lived quantum memory qubits entangled with telecommunication wavelength light fields remains an outstanding challenge
We report the first demonstration of a quantum memory element array, by spatially dividing a gas of cold Rubidium atoms into 12 independently addressable memory elements
Summary
“Robust and efficient quantum repeaters with atomic ensembles and linear optics,” Phys. D. Lukin, “Fast and robust approach to long-distance quantum communication with atomic ensembles,” Phys. Quantum repeater architectures, which use quantum memory elements as nodes and telecommunication wavelength light for transmission, hold promise to achieve such long-distance communication [1, 2, 3, 4, 5, 6].
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