A Quantum Repeater Node Demonstrating Unconditionally Secure Key Distribution
arXiv:2105.08691 · doi:10.1103/PhysRevLett.126.230506
Abstract
Long-distance quantum communication requires quantum repeaters to overcome photon loss in optical fibers. Here we demonstrate a repeater node with two memory atoms in an optical cavity. Both atoms are individually and repeatedly entangled with photons that are distributed until each communication partner has independently received one of them. An atomic Bell-state measurement followed by classical communication serves to establish a key. We demonstrate scaling advantage of the key rate, increase the effective attenuation length by a factor of two, and beat the error-rate threshold of 11\% for unconditionally secure communication, the corner stones for repeater-based quantum networks.
References in corpus (29)
- The Quantum Internet
- Quantum cryptography: Public key distribution and coin tossing
- The Security of Practical Quantum Key Distribution
- Long-distance quantum communication with atomic ensembles and linear optics
- Simple Proof of Security of the BB84 Quantum Key Distribution Protocol
- Measurement-device-independent quantum key distribution
- Secure quantum key distribution with realistic devices
- Overcoming the rate-distance barrier of quantum key distribution without using quantum repeaters
- Cavity-based quantum networks with single atoms and optical photons
- Advances in Quantum Teleportation
- Experimental demonstration of memory-enhanced quantum communication
- Efficient long distance quantum communication
- Experimental demonstration of a BDCZ quantum repeater node
- Quantum memories: emerging applications and recent advances
- Entanglement Distillation between Solid-State Quantum Network Nodes
- Experimental quantum key distribution beyond the repeaterless secret key capacity
- Memory-built-in quantum teleportation with photonic and atomic qubits
- Quantum Conference Key Agreement: A Review
- 2000-times repeated imaging of strontium atoms in clock-magic tweezer arrays
- Photon-Mediated Quantum Gate between Two Trapped Neutral Atoms in an Optical Cavity
- A Quantum Network Node with Crossed Optical Fibre Cavities
- Memory-assisted measurement-device-independent quantum key distribution
- Decoherence-protected memory for a single-photon qubit
- Experimental demonstration of memory-enhanced scaling for entanglement connection of quantum repeater segments
- Overcoming lossy channel bounds using a single quantum repeater node
- An integrated quantum repeater at telecom wavelength with single atoms in optical fiber cavities
- Long-distance entanglement distribution using individual atoms in optical cavities
- A network-ready random-access qubits memory
- Beating direct transmission bounds for quantum key distribution with a multiple quantum memory station
Cited by in corpus (34)
- Quantum repeaters: From quantum networks to the quantum internet
- Quantum networks with neutral atom processing nodes
- A telecom-wavelength quantum repeater node based on a trapped-ion processor
- Cavity-enhanced quantum network nodes
- Diamond Integrated Quantum Photonics: A Review
- Simulating quantum repeater strategies for multiple satellites
- Towards metropolitan free-space quantum networks
- A quantum-network register assembled with optical tweezers in an optical cavity
- Fusion of deterministically generated photonic graph states
- Multiplexed telecom-band quantum networking with atom arrays in optical cavities
- Requirements for a processing-node quantum repeater on a real-world fiber grid
- Ultra-low noise quantum memory for quasi-deterministic single photons generated by Rydberg collective atomic excitations
- Time-delayed single satellite quantum repeater node for global quantum communications
- Deep reinforcement learning for key distribution based on quantum repeaters
- Tweezer-assisted subwavelength positioning of atomic arrays in an optical cavity
- Proposal for a long-lived quantum memory using matter-wave optics with Bose-Einstein condensates in microgravity
- Frequency-multiplexed storage and distribution of narrowband telecom photon pairs over a 10-km fiber link with long-term system stability
- A reconfigurable entanglement distribution network suitable for connecting multiple ground nodes with a satellite
- Quantum-Memory-Enhanced Preparation of Nonlocal Graph States
- Raman Imaging of Atoms Inside a High-bandwidth Cavity
- Hybrid Quantum Repeaters with Ensemble-based Quantum Memories and Single-spin Photon Transducers
- Asymmetric node placement in fiber-based quantum networks
- Optimization of Quantum-Repeater Networks using Stochastic Automatic Differentiation
- Quantum repeater node with free-space coupled trapped ions
- Satellites promise global-scale quantum networks
- Universal quantum computation using atoms in cross-cavity systems
- Efficient generation of entangled multi-photon graph states from a single atom
- A Christmas Story about Quantum Teleportation
- Feasibility of Logical Bell State Generation in Memory Assisted Quantum Networks
- Quantum-enabled optical large-baseline interferometry: applications, protocols and feasibility
- Bursts of polarised single photons from atom-cavity sources
- Secure Quantum Key Distribution Using a Room-Temperature Quantum Emitter
- Scalable and modular generation of multipartite entangled states through memory-enhanced fusion
- Addressing requirements for crosstalk-free quantum-gate operation in many-body nanofiber cavity QED systems