Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Log inSign up
Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Blog
Job Board
Q3AS

© 2026 Aqora Quantum S.A.S.

TermsPrivacyLegal Notice

Quantum Information and Measurement (QIM)

Indistinguishability as a quantum information resource by localized measurements

Alessia Castellini, Bruno Bellomo, Giuseppe Compagno, Rosario Lo Franco

Published Jan 1, 2019• 0 citations
Publisher

Abstract

Quantum networks are typically made of identical subsystems. Exploiting indistinguishability as a direct quantum resource would thus be highly desirable. We show this is achievable by spatially localized measurements, enabling teleportation and entanglement swapping protocols.
DOI
10.1364/qim.2019.s3a.1

Related papers

Experimental quantum entanglement and teleportation by tuning remote spatial indistinguishability of independent photons

Kai Sun, Yan Wang, Zhenghao Liu +8 more

Quantitative control of spatial indistinguishability of identical subsystems as a direct quantum resource at distant sites has not yet been experimentally proven. We design a setup capable of tuning remote spatial indistinguishability of two independent photons by individually adjusting their spatial distribution in two distant regions, leading to polarization entanglement from uncorrelated photons. This is achieved by spatially localized operations and classical communication on photons that meet only at the detectors. The amount of entanglement depends uniquely on the degree of spatial indistinguishability, quantified by an entropic measure I , which enables teleportation with fidelities above the classical threshold. The results open the way to viable indistinguishability-enhanced quantum information processing.

arXiv:2003.10659•Optics Letters•Oct 14, 2020•39 citations

Entangling Independent Particles by Path Identity

Kai Wang, Zhaohua Hou, Kaiyi Qian +4 more

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. Here, we demonstrate that independent particles can be entangled without the need for direct interaction, prior established entanglement, or Bell-state measurements, by exploiting the indistinguishability of the origins of photon pairs. Our demonstrations challenge the long-standing belief that the prior generation and measurement of entanglement are necessary prerequisites for generating entanglement between independent particles that do not share a common past. In addition to its foundational interest, we show that this technique might lower the resource requirements in quantum networks, by reducing the complexity of photon sources and the overhead photon numbers.

arXiv:2412.03022•Physical Review Letters•Dec 2, 2024•8 citations

Enabling Hybrid Two-Photon Interference with a Time Lens

Jan Krzyżanowski, Jerzy Szuniewicz, Sanjay Kapoor +2 more

Single-photon indistinguishability is a crucial property for many photonic quantum technologies, as it directly affects the visibility of two-photon interference [1], which is used for entanglement swapping, quantum teleportation etc. It is critical for experiments involving quantum information exchange between two mismatched systems such as different photon source types [2] or for quantum repeaters.

Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC)•Jun 23, 2025•0 citations

Indistinguishability of Elementary Systems as a Resource for Quantum Information Processing

Rosario Lo Franco, G. Compagno

Typical elements of quantum networks are made by identical systems, which are the basic particles constituting a resource for quantum information processing. Whether the indistinguishability due to particle identity is an exploitable quantum resource remains an open issue. Here we study independently prepared identical particles showing that, when they spatially overlap, an operational entanglement exists that can be made manifest by means of separated localized measurements. We prove this entanglement is physical in that it can be directly exploited to activate quantum information protocols, such as teleportation. These results establish that particle indistinguishability is a utilizable quantum feature and open the way to new quantum-enhanced applications.

arXiv:1712.00706•Physical Review Letters•Jun 14, 2018•148 citations

Entanglement-Based Quantum Networking

Rob Thew

We discuss some of the challenges for the generation, distribution, control, measurement, and certification of quantum resources like entanglement in quantum communication networks. This spans integrated photonic devices to certifying multi-partite entanglement.

Quantum Information and Measurement (QIM)•Jan 1, 2019•1 citation

Recovery of distributed quantum information in quantum networks

Ankur Raina, Priya J. Nadkarni, Shayan Garani Srinivasa

We use quantum networks to store quantum information in a distributed setting. We propose recovery methods to restore the stored quantum information in the event of failure of any of the nodes of the network.

Frontiers in Optics•Jan 1, 2017•1 citation
Quantitative control of spatial indistinguishability of identical subsystems as a direct quantum resource at distant sites has not yet been experimentally proven. We design a setup capable of tuning remote spatial indistinguishability of two independent photons by individually adjusting their spatial distribution in two distant regions, leading to polarization entanglement from uncorrelated photons. This is achieved by spatially localized operations and classical communication on photons that meet only at the detectors. The amount of entanglement depends uniquely on the degree of spatial indistinguishability, quantified by an entropic measure I , which enables teleportation with fidelities above the classical threshold. The results open the way to viable indistinguishability-enhanced quantum information processing.
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. Here, we demonstrate that independent particles can be entangled without the need for direct interaction, prior established entanglement, or Bell-state measurements, by exploiting the indistinguishability of the origins of photon pairs. Our demonstrations challenge the long-standing belief that the prior generation and measurement of entanglement are necessary prerequisites for generating entanglement between independent particles that do not share a common past. In addition to its foundational interest, we show that this technique might lower the resource requirements in quantum networks, by reducing the complexity of photon sources and the overhead photon numbers.
Typical elements of quantum networks are made by identical systems, which are the basic particles constituting a resource for quantum information processing. Whether the indistinguishability due to particle identity is an exploitable quantum resource remains an open issue. Here we study independently prepared identical particles showing that, when they spatially overlap, an operational entanglement exists that can be made manifest by means of separated localized measurements. We prove this entanglement is physical in that it can be directly exploited to activate quantum information protocols, such as teleportation. These results establish that particle indistinguishability is a utilizable quantum feature and open the way to new quantum-enhanced applications.