Entangling metropolitan-distance separated quantum memories

Abstract

Quantum internet gives the promise of getting all quantum resources connected, and it will enable applications far beyond a localized scenario. A prototype is a network of quantum memories that are entangled and well separated. Previous realizations are limited in the distance. In this paper, we report the establishment of remote entanglement between two atomic quantum memories physically separated by 12.5 km directly in a metropolitan area. We create atom-photon entanglement in one node and send the photon to a second node for storage. We harness low-loss transmission through a field-deployed fiber of 20.5 km by making use of frequency down-conversion and up-conversion. The final memory-memory entanglement is verified to have a fidelity of 90% via retrieving to photons. Our experiment paves the way to study quantum network applications in a practical scenario.

arXiv comment9 pages in total, 4 figures in the main text, and 5 figures in the supplementary material

References in corpus (38)

• The Quantum Internet
• Long-distance quantum communication with atomic ensembles and linear optics
• Experimental loophole-free violation of a Bell inequality using entangled electron spins separated by 1.3 km
• Device-independent security of quantum cryptography against collective attacks
• No Signalling and Quantum Key Distribution
• A quantum network of clocks
• Large Scale Modular Quantum Computer Architecture with Atomic Memory and Photonic Interconnects
• Realization of a multi-node quantum network of remote solid-state qubits
• Device-independent quantum key distribution secure against collective attacks
• Unconditional quantum teleportation between distant solid-state qubits
• Event-Ready Bell Test Using Entangled Atoms Simultaneously Closing Detection and Locality Loopholes
• Entanglement of two quantum memories via fibers over dozens of kilometres
• Generation of heralded entanglement between distant hole spins
• Modular Entanglement of Atomic Qubits using both Photons and Phonons
• Telecom-heralded entanglement between remote multimode solid-state quantum memories
• Efficient quantum memory for single photon polarization qubits
• Deterministic teleportation of a quantum gate between two logical qubits
• A Quantum-Logic Gate between Distant Quantum-Network Modules
• Heralded entanglement distribution between two absorptive quantum memories
• Highly efficient optical quantum memory with long coherence time in cold atoms
• An efficient quantum light-matter interface with sub-second lifetime
• High-fidelity entanglement between a trapped ion and a telecom photon via quantum frequency conversion
• Photonic quantum state transfer between a cold atomic gas and a crystal
• Ultimate low system dark count rate for superconducting nanowire single-photon detector
• Long-distance distribution of atom-photon entanglement at telecom wavelength
• Light-matter entanglement over 50 km of optical fibre
• Polarization insensitive frequency conversion for an atom-photon entanglement distribution via a telecom network
• Entanglement between a diamond spin qubit and a photonic time-bin qubit at telecom wavelength
• Heralded Storage of a Photonic Quantum Bit in a Single Atom
• Quantum Teleportation between Remote Qubit Memories with Only a Single Photon as a Resource
• Hybrid entanglement of three quantum memories with three photons
• Efficient reversible entanglement transfer between light and quantum memories
• A cold atom temporally multiplexed quantum memory with cavity-enhanced noise suppression
• Cavity-Enhanced Atom-Photon Entanglement with Subsecond Lifetime
• High-Capacity Angularly-Multiplexed Holographic Memory Operating at the Single Photon Level
• Freezing motion-induced dephasing in an atomic-ensemble quantum memory
• Deterministic Time-Bin Entanglement between a Single Photon and an Atomic Ensemble
• Measurement-Device-Independent Verification of a Quantum Memory

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• Metropolitan-scale heralded entanglement of solid-state qubits
• Nonreciprocal enhancement of remote entanglement between nonidentical mechanical oscillators
• Telecom networking with a diamond quantum memory
• Development of a Boston-area 50-km fiber quantum network testbed
• Transmission of light-matter entanglement over a metropolitan network
• Telecom Quantum Photonic Interface for a ${}^{40}$Ca${}^{+}$ Single-Ion Quantum Memory
• Tripartite quantum entanglement with squeezed optomechanics
• Two-stage, low noise quantum frequency conversion of single photons from silicon-vacancy centers in diamond to the telecom C-band
• Nonlinear Domain Engineering for Quantum Technologies
• Quantum Internet: Technologies, Protocols, and Research Challenges
• Complex quantum network models from spin clusters
• Quantum entanglement generation on magnons assisted with microwave cavities coupled to a superconducting qubit
• Room-temperature ladder-type optical memory compatible with single photons from InGaAs quantum dots
• A source of heralded atom-photon entanglement for quantum networking
• Kilometer-Scale Ion-Photon Entanglement with a Metastable ${}^{88}$Sr${}^{+}$ Qubit
• Hybrid classical-quantum communication networks
• Nonreciprocal Coupling Induced Non-Hermitian Entanglement in Optomechanical Systems