Fast delivery of heralded atom-photon quantum correlation over 12km fiber through multiplexing enhancement

Abstract

Distributing quantum entanglement between distant parties is a significant but difficult task in quantum information science, as it can enable numerous applications but suffers from exponential decay in the quantum channel. Quantum repeater is one of the most promising approaches towards this goal. In a quantum repeater protocol, it is essential that the entanglement generation speed within each elementary link is faster than the memory decoherence rate, to enable the scale-up of the quantum repeater by connecting neighboring repeater segments. This stringent requirement has not been implemented over a fiber of metropolitan scale so far. As a step towards this challenging goal, in this work we experimentally realize multiplexing-enhanced generation of heralded atom-photon quantum correlation over a 12km fiber. We excite the memory modes in a multiplexed quantum memory successively to generate 280 pairs of atom-photon quantum correlations with a train of photonic time-bin pulses filling the long fiber. After successful detection of a heralding signal, the excited memory mode can be identified and retrieved into idler photons on demand with either fixed or variable storage time. With the multiplexing enhancement, the heralding rate of atom-photon correlation can reach 1.95kHz, and the ratio between the quantum correlation generation rate to memory decoherence rate can be improved to 0.46 for a fiber length of 12km, which is so far the best for long fiber length (>10km) to our knowledge. This work therefore constitutes an important step towards the realization of a large-scale quantum repeater network.

13 pages, 10 figures

References in corpus (18)

• Realization of a multi-node quantum network of remote solid-state qubits
• Quantum Repeaters with Photon Pair Sources and Multi-Mode Memories
• Experimental demonstration of a BDCZ quantum repeater node
• Modular Entanglement of Atomic Qubits using both Photons and Phonons
• Experimental device-independent quantum key distribution between distant users
• Multiplexed Memory-Insensitive Quantum Repeaters
• Entanglement of Nanophotonic Quantum Memory Nodes in a Telecom Network
• Entangling single atoms over 33 km telecom fibre
• A Quantum-Logic Gate between Distant Quantum-Network Modules
• Entanglement of trapped-ion qubits separated by 230 meters
• Experimental realization of a multiplexed quantum memory with 225 individually accessible memory cells
• A multinode quantum network over a metropolitan area
• A telecom-wavelength quantum repeater node based on a trapped-ion processor
• Direct measurement of decoherence for entanglement between a photon and stored atomic excitation
• Wavevector multiplexed quantum memory via spatially-resolved single-photon detection
• Transmission of light-matter entanglement over a metropolitan network
• Realization of a programmable multi-purpose photonic quantum memory with over-thousand qubit manipulations
• A photon-interfaced ten qubit quantum network node

Cited by in corpus (7)

• A solid-state temporally multiplexed quantum memory array at the single-photon level
• Realization of a crosstalk-free two-ion node for long-distance quantum networking
• Remote Quantum Networks based on Quantum Memories
• Scalable and modular generation of multipartite entangled states through memory-enhanced fusion
• Temporally multiplexed ion-photon quantum interface via fast ion-chain transport
• Multiplexed ion-ion entanglement over $1.2$ kilometer fibers
• Quantum Storage of Qubits in an Array of Independently Controllable Solid-State Quantum Memories