Entanglement swapping forms a key concept in the realization of scalable quantum networks and large-scale quantum communication. For the practical implementation of entanglement swapping, completely autonomous entanglement sources and a joint Bell-state measurement (BSM) between two independent photons are essential. Here, we experimentally demonstrate entanglement swapping between two independent polarization-entangled photon-pair sources obtained via spontaneous four-wave mixing (SFWM) in a Doppler-broadened atomic ensemble of ${^{87}}{\rm Rb}$Rb atoms. From the joint BSM, we estimate the ${\rm S}$S parameter in the Clauser-Horne-Shimony-Holt (CHSH) form of Bell's inequality and confirm the violation of the Bell-CHSH inequality by ${\rm S}={2.32} \pm {0.07}$S=2.32±0.07 with 4.5 standard deviations. We believe that this work is an important step toward realizing practical scalable quantum networks.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1364/OL.388613 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Entangling Independent Particles by Path Identity.
Phys Rev Lett
December 2024
National Laboratory of Solid-state Microstructures, School of Physics, Collaborative Innovation Center of Advanced Microstructures, Jiangsu Physical Science Research Center, Nanjing University, Nanjing 210093, China.
Quantum entanglement-correlations of particles that are stronger than any classical analog-is the basis for research on the foundations of quantum mechanics and for practical applications such as quantum networks. Traditionally, entanglement is achieved through local interactions or via entanglement swapping, where entanglement at a distance is generated through previously established entanglement and Bell-state measurements. However, the precise requirements enabling the generation of quantum entanglement without traditional local interactions remain less explored.
View Article and Find Full Text PDFTeleportation of a genuine single-rail vacuum-one-photon qubit generated via a quantum dot source.
Npj Nanophoton
November 2024
Dipartimento di Fisica, Sapienza Università di Roma, Roma, Italy.
Quantum state teleportation represents a pillar of quantum information and a milestone on the roadmap towards quantum networks with a large number of nodes. Successful photonic demonstrations of this protocol have been carried out employing different qubit encodings. However, demonstrations in the Fock basis encoding are challenging, due to the impossibility of generating a coherent superposition of vacuum-one photon states on a single mode with linear optics.
View Article and Find Full Text PDFOptimal routing and end-to-end entanglement distribution in quantum networks.
Sci Rep
August 2024
Vodafone Chair Mobile Communications Systems, Technische Universität Dresden, 01067, Dresden, Germany.
Article Synopsis
- - Quantum networks aim to transmit qubits between devices using processes like entanglement distribution and swapping, which are crucial but can degrade performance due to their probabilistic nature.
- - The study focuses on optimizing resource allocation in these networks by modeling the problem with integer linear programming (ILP) and a heuristic algorithm to minimize the number of required entangled qubit pairs.
- - Simulations show that while the heuristic provides solutions close to optimal, the utilization of entangled pairs is significantly influenced by factors like the probability of entanglement and the characteristics of the quantum memory.
Symbolic model checking quantum circuits in Maude.
PeerJ Comput Sci
June 2024
School of Information Science, Japan Advanced Institute of Science and Technology, Asahidai, Nomi, Ishikawa, Japan.
This article presents a symbolic approach to model checking quantum circuits using a set of laws from quantum mechanics and basic matrix operations with Dirac notation. We use Maude, a high-level specification/programming language based on rewriting logic, to implement our symbolic approach. As case studies, we use the approach to formally specify several quantum communication protocols in the early work of quantum communication and formally verify their correctness: Superdense Coding, Quantum Teleportation, Quantum Secret Sharing, Entanglement Swapping, Quantum Gate Teleportation, Two Mirror-image Teleportation, and Quantum Network Coding.
View Article and Find Full Text PDFUniversal terminal for cloud quantum computing.
Sci Rep
July 2024
Department of Physics, University of Tehran, 14395-547, Tehran, Iran.
To bring the quantum computing capacities to the personal edge devices, the optimum approach is to have simple non-error-corrected personal devices that offload the computational tasks to scalable quantum computers via edge servers with cryogenic components and fault-tolerant schemes. Hence the network elements deploy different encoding protocols. This article proposes quantum terminals that are compatible with different encoding protocols; paving the way for realizing mobile edge-quantum computing.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!